CVE-2026-23364
published 2026-03-25CVE-2026-23364: In the Linux kernel, the following vulnerability has been resolved: ksmbd: Compare MACs in constant time To prevent timing attacks, MAC comparisons need to be…
PriorityP340high7.4CVSS 3.1
AVNACHPRNUINSUCHIHAN
EPSS
0.40%
32.9th percentile
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: Compare MACs in constant time
To prevent timing attacks, MAC comparisons need to be constant-time.
Replace the memcmp() with the correct function, crypto_memneq().
Affected
69 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.19.8-1 (forky) | linux 6.19.8-1 (forky) |
| linux | linux | — | — |
| linux | linux | >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 8a665d733940592e671ec6afadcd0be80a091a80 | 8a665d733940592e671ec6afadcd0be80a091a80 |
| linux | linux | >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < cd52a0e309659537048a864211abc3ea4c5caa63 | cd52a0e309659537048a864211abc3ea4c5caa63 |
| linux | linux | >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 307afccb751f542246bd5dc68a2c1ffe1a78418c | 307afccb751f542246bd5dc68a2c1ffe1a78418c |
| linux | linux | >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 2cdc56ed67615ba0921383a688f24415ebe065f3 | 2cdc56ed67615ba0921383a688f24415ebe065f3 |
| linux | linux | >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < 93c0a22fec914ec4b697e464895a0f594e29fb28 | 93c0a22fec914ec4b697e464895a0f594e29fb28 |
| linux | linux | >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < f4588b85efd6007d46b80aa1b9fb746628ffb3dc | f4588b85efd6007d46b80aa1b9fb746628ffb3dc |
| linux | linux | >= e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 < c5794709bc9105935dbedef8b9cf9c06f2b559fa | c5794709bc9105935dbedef8b9cf9c06f2b559fa |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 6.19.8-1 | 6.19.8-1 |
| linux | linux_kernel | >= 5.15.0 < 6.1.167 | 6.1.167 |
| linux | linux_kernel | >= 5.15.1 < 6.1.167 | 6.1.167 |
| linux | linux_kernel | >= 6.13 < 6.18.19 | 6.18.19 |
| linux | linux_kernel | >= 6.13.0 < 6.18.19 | 6.18.19 |
| linux | linux_kernel | >= 6.19 < 6.19.7 | 6.19.7 |
| linux | linux_kernel | >= 6.19.0 < 6.19.7 | 6.19.7 |
| linux | linux_kernel | >= 6.2 < 6.6.130 | 6.6.130 |
CVSS provenance
nvdv3.17.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
osv7.4HIGH
vendor_debian7.4HIGH
vendor_redhat7.4HIGH
vendor_msrc5.5MEDIUM
vendor_ubuntu5.5MEDIUM
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Ubuntu
Linux kernel (NVIDIA) vulnerabilities
vendor_ubuntu·2026-10-09·CVSS 5.5
CVE-2026-46086 [MEDIUM] Linux kernel (NVIDIA) vulnerabilities
Title: Linux kernel (NVIDIA) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the i.MX clock driver in the Linux kernel did not
properly handle certain memory allocation failure conditions, leading to a
null pointer dereference vulnerability. A local attacker could possibly use
this to cause a denial of service (system crash). (CVE-2022-3114)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- User-space API (UAPI);
- ARM32 architecture;
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- User-Mode Linux (UML);
- x86 architecture;
- Block layer subsystem;
- Cryptogr
Ubuntu
Linux kernel (Azure CVM) vulnerabilities
vendor_ubuntu·2026-10-06·CVSS 5.5
CVE-2026-68461 [MEDIUM] Linux kernel (Azure CVM) vulnerabilities
Title: Linux kernel (Azure CVM) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the i.MX clock driver in the Linux kernel did not
properly handle certain memory allocation failure conditions, leading to a
null pointer dereference vulnerability. A local attacker could possibly use
this to cause a denial of service (system crash). (CVE-2022-3114)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM32 architecture;
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- User-Mode Linux (UML);
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- ACPI driv
Ubuntu
Linux kernel (GCP) vulnerabilities
vendor_ubuntu·2026-10-06·CVSS 5.5
CVE-2026-31711 [MEDIUM] Linux kernel (GCP) vulnerabilities
Title: Linux kernel (GCP) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the i.MX clock driver in the Linux kernel did not
properly handle certain memory allocation failure conditions, leading to a
null pointer dereference vulnerability. A local attacker could possibly use
this to cause a denial of service (system crash). (CVE-2022-3114)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- User-space API (UAPI);
- ARM32 architecture;
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- User-Mode Linux (UML);
- x86 architecture;
- Block layer subsystem;
- Cryptograph
Ubuntu
Linux kernel (Oracle) vulnerabilities
vendor_ubuntu·2026-10-06·CVSS 5.5
CVE-2026-31711 [MEDIUM] Linux kernel (Oracle) vulnerabilities
Title: Linux kernel (Oracle) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the i.MX clock driver in the Linux kernel did not
properly handle certain memory allocation failure conditions, leading to a
null pointer dereference vulnerability. A local attacker could possibly use
this to cause a denial of service (system crash). (CVE-2022-3114)
It was discovered that some Arm processors could complete a broadcast
translation lookaside buffer (TLB) invalidation before memory writes made
through the invalidated translation were globally observed. A local
attacker could possibly use this to write to memory after permission to do
so had been revoked, bypassing memory protections or escalating privileges.
(CVE-2025-10263)
Several security
Ubuntu
Linux kernel (GCP) vulnerabilities
vendor_ubuntu·2026-10-06·CVSS 5.5
CVE-2026-31711 [MEDIUM] Linux kernel (GCP) vulnerabilities
Title: Linux kernel (GCP) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the i.MX clock driver in the Linux kernel did not
properly handle certain memory allocation failure conditions, leading to a
null pointer dereference vulnerability. A local attacker could possibly use
this to cause a denial of service (system crash). (CVE-2022-3114)
It was discovered that some Arm processors could complete a broadcast
translation lookaside buffer (TLB) invalidation before memory writes made
through the invalidated translation were globally observed. A local
attacker could possibly use this to write to memory after permission to do
so had been revoked, bypassing memory protections or escalating privileges.
(CVE-2025-10263)
Several security is
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-10-06·CVSS 5.5
CVE-2026-68461 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that the i.MX clock driver in the Linux kernel did not
properly handle certain memory allocation failure conditions, leading to a
null pointer dereference vulnerability. A local attacker could possibly use
this to cause a denial of service (system crash). (CVE-2022-3114)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- User-space API (UAPI);
- ARM32 architecture;
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- User-Mode Linux (UML);
- x86 architecture;
- Block layer subsystem;
- Cryptographic API
Ubuntu
Linux kernel (Raspberry Pi) vulnerabilities
vendor_ubuntu·2026-08-20·CVSS 2.0
CVE-2026-45855 [LOW] Linux kernel (Raspberry Pi) vulnerabilities
Title: Linux kernel (Raspberry Pi) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values.
Ubuntu
Linux kernel (HWE) vulnerabilities
vendor_ubuntu·2026-07-28·CVSS 2.0
CVE-2026-46073 [LOW] Linux kernel (HWE) vulnerabilities
Title: Linux kernel (HWE) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A local a
Ubuntu
Linux kernel (Azure CVM) vulnerabilities
vendor_ubuntu·2026-07-24·CVSS 2.0
CVE-2026-46073 [LOW] Linux kernel (Azure CVM) vulnerabilities
Title: Linux kernel (Azure CVM) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A l
Ubuntu
Linux kernel (Azure FIPS) vulnerabilities
vendor_ubuntu·2026-07-24·CVSS 2.0
CVE-2026-46073 [LOW] Linux kernel (Azure FIPS) vulnerabilities
Title: Linux kernel (Azure FIPS) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A
Ubuntu
Linux kernel (Azure CVM) vulnerabilities
vendor_ubuntu·2026-07-24·CVSS 2.0
CVE-2026-43129 [LOW] Linux kernel (Azure CVM) vulnerabilities
Title: Linux kernel (Azure CVM) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A l
Ubuntu
Linux kernel (Azure) vulnerabilities
vendor_ubuntu·2026-07-24·CVSS 2.0
CVE-2026-46073 [LOW] Linux kernel (Azure) vulnerabilities
Title: Linux kernel (Azure) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A local
Ubuntu
Linux kernel (AWS) vulnerabilities
vendor_ubuntu·2026-07-24·CVSS 2.0
CVE-2026-46073 [LOW] Linux kernel (AWS) vulnerabilities
Title: Linux kernel (AWS) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A local a
Ubuntu
Linux kernel (Oracle) vulnerabilities
vendor_ubuntu·2026-07-23·CVSS 2.0
CVE-2026-46073 [LOW] Linux kernel (Oracle) vulnerabilities
Title: Linux kernel (Oracle) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A loca
Ubuntu
Linux kernel (NVIDIA) vulnerabilities
vendor_ubuntu·2026-07-23·CVSS 2.0
CVE-2026-43129 [LOW] Linux kernel (NVIDIA) vulnerabilities
Title: Linux kernel (NVIDIA) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A loca
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-07-23·CVSS 2.0
CVE-2026-46073 [LOW] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A local attacke
Ubuntu
Linux kernel (GCP FIPS) vulnerabilities
vendor_ubuntu·2026-07-21·CVSS 2.0
CVE-2026-46073 [LOW] Linux kernel (GCP FIPS) vulnerabilities
Title: Linux kernel (GCP FIPS) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A lo
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-07-20·CVSS 2.0
CVE-2026-46073 [LOW] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A local attacke
Red Hat
kernel: ksmbd: Compare MACs in constant time
vendor_redhat·2026-03-25·CVSS 7.4
CVE-2026-23364 [HIGH] CWE-208 kernel: ksmbd: Compare MACs in constant time
kernel: ksmbd: Compare MACs in constant time
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: Compare MACs in constant time
To prevent timing attacks, MAC comparisons need to be constant-time.
Replace the memcmp() with the correct function, crypto_memneq().
A flaw was found in ksmbd, a Linux kernel module. This vulnerability stems from the use of a non-constant time memory comparison function when verifying Message Authentication Codes (MACs). A remote attacker could exploit this timing difference to conduct a timing attack, potentially leading to the disclosure of sensitive information.
Package: kernel (Red Hat Enterprise Linux 10) - Not affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not af
Microsoft
ksmbd: Compare MACs in constant time
vendor_msrc·2026-03-10·CVSS 5.5
CVE-2026-23364 [HIGH] ksmbd: Compare MACs in constant time
ksmbd: Compare MACs in constant time
Mariner: Mariner
Linux: Linux
Customer Action Required: Yes
Remediation: CBL-Mariner Releases
Reference: https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade
Debian
CVE-2026-23364: linux - In the Linux kernel, the following vulnerability has been resolved: ksmbd: Comp...
vendor_debian·2026·CVSS 7.4
CVE-2026-23364 [HIGH] CVE-2026-23364: linux - In the Linux kernel, the following vulnerability has been resolved: ksmbd: Comp...
In the Linux kernel, the following vulnerability has been resolved: ksmbd: Compare MACs in constant time To prevent timing attacks, MAC comparisons need to be constant-time. Replace the memcmp() with the correct function, crypto_memneq().
Scope: local
bookworm: open
bullseye: resolved
forky: resolved (fixed in 6.19.8-1)
sid: resolved (fixed in 6.19.8-1)
trixie: open
VulDB
Linux Kernel up to 7.0-rc1 ksmbd memcmp timing discrepancy (Nessus ID 311783 / WID-SEC-2026-0861)
vuldb·2026-06-20·CVSS 7.4
CVE-2026-23364 [HIGH] Linux Kernel up to 7.0-rc1 ksmbd memcmp timing discrepancy (Nessus ID 311783 / WID-SEC-2026-0861)
A vulnerability labeled as problematic has been found in Linux Kernel up to 7.0-rc1. Affected by this issue is the function memcmp of the component ksmbd. Such manipulation leads to observable timing discrepancy.
This vulnerability is referenced as CVE-2026-23364. The attack needs to be initiated within the local network. No exploit is available.
The affected component should be upgraded.
OSV
CVE-2026-23364: In the Linux kernel, the following vulnerability has been resolved: ksmbd: Compare MACs in constant time To prevent timing attacks, MAC comparisons ne
osv·2026-03-25·CVSS 7.4
CVE-2026-23364 [HIGH] CVE-2026-23364: In the Linux kernel, the following vulnerability has been resolved: ksmbd: Compare MACs in constant time To prevent timing attacks, MAC comparisons ne
In the Linux kernel, the following vulnerability has been resolved: ksmbd: Compare MACs in constant time To prevent timing attacks, MAC comparisons need to be constant-time. Replace the memcmp() with the correct function, crypto_memneq().
GHSA
GHSA-4mmg-5v66-42gx: In the Linux kernel, the following vulnerability has been resolved:
ksmbd: Compare MACs in constant time
To prevent timing attacks, MAC comparisons
ghsa_unreviewed·2026-03-25
CVE-2026-23364 [HIGH] GHSA-4mmg-5v66-42gx: In the Linux kernel, the following vulnerability has been resolved:
ksmbd: Compare MACs in constant time
To prevent timing attacks, MAC comparisons
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: Compare MACs in constant time
To prevent timing attacks, MAC comparisons need to be constant-time.
Replace the memcmp() with the correct function, crypto_memneq().
OSV
ksmbd: Compare MACs in constant time
osv·2026-03-25·CVSS 7.4
CVE-2026-23364 [HIGH] ksmbd: Compare MACs in constant time
ksmbd: Compare MACs in constant time
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: Compare MACs in constant time
To prevent timing attacks, MAC comparisons need to be constant-time.
Replace the memcmp() with the correct function, crypto_memneq().
No detection rules found.
No public exploits indexed.
Wiz
CVE-2026-23364 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 7.4
CVE-2026-23364 [HIGH] CVE-2026-23364 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-23364 :
CBL Mariner vulnerability analysis and mitigation
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: Compare MACs in constant time
To prevent timing attacks, MAC comparisons need to be constant-time.
Replace the memcmp() with the correct function, crypto_memneq().
Source : NVD
## 7.4
Score
Published March 25, 2026
Severity HIGH
CNA Score 7.4
Affected Technologies
CBL Mariner
Linux Debian
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 14.4
Exploitation Probability (EPSS) N/A
Affected packages and libraries
linux-azure-fde-6.17
linux-gkeop
Sources
NVD
CBL-Mariner 3.0 Severity MEDIUM Has Fix Added at: Apr 02, 2026
Debian 12, 13 Sever
Bugzilla
CVE-2026-23364 kernel: ksmbd: Compare MACs in constant time
bugzilla·2026-03-25·CVSS 7.4
CVE-2026-23364 [HIGH] CVE-2026-23364 kernel: ksmbd: Compare MACs in constant time
CVE-2026-23364 kernel: ksmbd: Compare MACs in constant time
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: Compare MACs in constant time
To prevent timing attacks, MAC comparisons need to be constant-time.
Replace the memcmp() with the correct function, crypto_memneq().
Discussion:
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026032539-CVE-2026-23364-4267@gregkh/T
https://git.kernel.org/stable/c/2cdc56ed67615ba0921383a688f24415ebe065f3https://git.kernel.org/stable/c/307afccb751f542246bd5dc68a2c1ffe1a78418chttps://git.kernel.org/stable/c/8a665d733940592e671ec6afadcd0be80a091a80https://git.kernel.org/stable/c/93c0a22fec914ec4b697e464895a0f594e29fb28https://git.kernel.org/stable/c/c5794709bc9105935dbedef8b9cf9c06f2b559fahttps://git.kernel.org/stable/c/cd52a0e309659537048a864211abc3ea4c5caa63https://git.kernel.org/stable/c/f4588b85efd6007d46b80aa1b9fb746628ffb3dchttps://cert-portal.siemens.com/productcert/html/ssa-784472.html
2026-03-25
Published