CVE-2026-64136
published 2026-07-19CVE-2026-64136: In the Linux kernel, the following vulnerability has been resolved: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked() Commit…
PriorityP348critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.49%
40.5th percentile
In the Linux kernel, the following vulnerability has been resolved:
smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
Commit 96c4af418586 ("cifs: Fix locking usage for tcon fields")
refactored cifs code to change cifs_tcp_ses_lock for tc_lock around
tc_count changes.
There was missing lock around tc_count increment inside
smb2_find_smb_sess_tcon_unlocked().
Affected
51 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | >= 3969db6b22e3d90d8c5f22ac1a7fe0350a94c136 < bf4ebdb19ff9b3cdf992b50715fe61633327416a | bf4ebdb19ff9b3cdf992b50715fe61633327416a |
| linux | linux | >= 6.12.75 < 6.12.92 | 6.12.92 |
| linux | linux | >= 6.18.16 < 6.18.34 | 6.18.34 |
| linux | linux | >= 6.19.6 < 6.20 | 6.20 |
| linux | linux | >= 6.6.128 < 6.6.142 | 6.6.142 |
| linux | linux | >= 601dd3b79769b38d30b693c40afdb2a4b7edf9d0 < 13fb413ae22a37c69341918a6d651d19a9b0b9b7 | 13fb413ae22a37c69341918a6d651d19a9b0b9b7 |
| linux | linux | >= 953953abb66e52c224057ab91e404284fefeab62 < 7df1df6f40c0720d30206aa35c0343b962350e0d | 7df1df6f40c0720d30206aa35c0343b962350e0d |
| linux | linux | >= 96c4af418586ee9a6aab61738644366426e05316 < e374f4e496fef8168784f93a4477d67be34485fd | e374f4e496fef8168784f93a4477d67be34485fd |
| linux | linux | >= 96c4af418586ee9a6aab61738644366426e05316 < 4d8690dace005a38e6dbde9ecce2da3ad85c7c41 | 4d8690dace005a38e6dbde9ecce2da3ad85c7c41 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 6.12.75 < 6.12.92 | 6.12.92 |
| linux | linux_kernel | >= 6.18.16 < 6.18.34 | 6.18.34 |
| linux | linux_kernel | >= 6.19.6 < 7.0.11 | 7.0.11 |
| linux | linux_kernel | >= 6.6.128 < 6.6.142 | 6.6.142 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-6.8 | — | — |
| ubuntu | linux-aws-fips | — | — |
| ubuntu | linux-azure | — | — |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_redhat9.8CRITICAL
vendor_ubuntu9.1CRITICAL
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Ubuntu
Linux kernel (IBM) vulnerabilities
vendor_ubuntu·2026-10-08·CVSS 9.1
CVE-2026-64087 [CRITICAL] Linux kernel (IBM) vulnerabilities
Title: Linux kernel (IBM) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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 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:
- ARM64 architecture;
- ARM32 architecture;
- MIPS architecture;
- PowerPC architecture;
- x86 architecture;
- Intel NPU Driver;
-
Ubuntu
Linux kernel (Oracle) vulnerabilities
vendor_ubuntu·2026-09-29·CVSS 9.1
CVE-2026-64191 [CRITICAL] Linux kernel (Oracle) vulnerabilities
Title: Linux kernel (Oracle) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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)
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)
Several security issues were d
Ubuntu
Linux kernel (AWS) vulnerabilities
vendor_ubuntu·2026-09-29·CVSS 5.5
CVE-2026-64064 [MEDIUM] Linux kernel (AWS) vulnerabilities
Title: Linux kernel (AWS) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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;
- PowerPC architecture;
- Compute Acceleration Framework;
- Drivers core;
- Bluetooth drivers;
- Arm Firmware Framework for ARMv8-A(FFA);
- EFI core;
- GPU drivers;
- Hardware monitoring drivers;
- InfiniBand drivers;
- Network drivers;
- Microsoft Azure Network Adapter (MANA) driver;
- SCSI subsystem;
- SPI subsystem;
- Network file systems library;
- NTFS3 file system;
- SMB network file system;
- File systems infrastructure;
- Software nodes and device propert
Ubuntu
Linux kernel (AWS FIPS) vulnerabilities
vendor_ubuntu·2026-09-25·CVSS 5.5
CVE-2026-64064 [MEDIUM] Linux kernel (AWS FIPS) vulnerabilities
Title: Linux kernel (AWS FIPS) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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;
- PowerPC architecture;
- Compute Acceleration Framework;
- Drivers core;
- Bluetooth drivers;
- Arm Firmware Framework for ARMv8-A(FFA);
- EFI core;
- GPU drivers;
- Hardware monitoring drivers;
- InfiniBand drivers;
- Network drivers;
- Microsoft Azure Network Adapter (MANA) driver;
- SCSI subsystem;
- SPI subsystem;
- Network file systems library;
- NTFS3 file system;
- SMB network file system;
- File systems infrastructure;
- Software nodes and device pr
Ubuntu
Linux kernel (Low Latency) vulnerabilities
vendor_ubuntu·2026-09-22·CVSS 5.5
CVE-2026-64088 [MEDIUM] Linux kernel (Low Latency) vulnerabilities
Title: Linux kernel (Low Latency) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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;
- PowerPC architecture;
- Compute Acceleration Framework;
- Drivers core;
- Bluetooth drivers;
- Arm Firmware Framework for ARMv8-A(FFA);
- EFI core;
- GPU drivers;
- Hardware monitoring drivers;
- InfiniBand drivers;
- Network drivers;
- Microsoft Azure Network Adapter (MANA) driver;
- SCSI subsystem;
- SPI subsystem;
- Network file systems library;
- NTFS3 file system;
- SMB network file system;
- File systems infrastructure;
- Software nodes and device
Ubuntu
Linux kernel (Azure) vulnerabilities
vendor_ubuntu·2026-09-22·CVSS 9.1
CVE-2026-52938 [CRITICAL] Linux kernel (Azure) vulnerabilities
Title: Linux kernel (Azure) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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)
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)
Several security issues were di
Ubuntu
Linux kernel (Oracle) vulnerabilities
vendor_ubuntu·2026-09-22·CVSS 5.5
CVE-2026-64182 [MEDIUM] Linux kernel (Oracle) vulnerabilities
Title: Linux kernel (Oracle) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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;
- PowerPC architecture;
- Compute Acceleration Framework;
- Drivers core;
- Bluetooth drivers;
- Arm Firmware Framework for ARMv8-A(FFA);
- EFI core;
- GPU drivers;
- Hardware monitoring drivers;
- InfiniBand drivers;
- Network drivers;
- Microsoft Azure Network Adapter (MANA) driver;
- SCSI subsystem;
- SPI subsystem;
- Network file systems library;
- NTFS3 file system;
- SMB network file system;
- File systems infrastructure;
- Software nodes and device prop
Ubuntu
Linux kernel (NVIDIA Tegra) vulnerabilities
vendor_ubuntu·2026-09-18·CVSS 9.1
CVE-2026-53358 [CRITICAL] Linux kernel (NVIDIA Tegra) vulnerabilities
Title: Linux kernel (NVIDIA Tegra) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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 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:
- ARM64 architecture;
- User-space API (UAPI);
- Kernel build system;
- ARM32 architecture;
- PowerPC architecture;
- RIS
Ubuntu
Linux kernel (Raspberry Pi Real-time) vulnerabilities
vendor_ubuntu·2026-09-18·CVSS 5.5
CVE-2026-64182 [MEDIUM] Linux kernel (Raspberry Pi Real-time) vulnerabilities
Title: Linux kernel (Raspberry Pi Real-time) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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;
- PowerPC architecture;
- Compute Acceleration Framework;
- Drivers core;
- Bluetooth drivers;
- Arm Firmware Framework for ARMv8-A(FFA);
- EFI core;
- GPU drivers;
- Hardware monitoring drivers;
- InfiniBand drivers;
- Network drivers;
- Microsoft Azure Network Adapter (MANA) driver;
- SCSI subsystem;
- SPI subsystem;
- Network file systems library;
- NTFS3 file system;
- SMB network file system;
- File systems infrastructure;
- Software nodes
Ubuntu
Linux kernel (Azure FIPS) vulnerabilities
vendor_ubuntu·2026-09-18·CVSS 5.5
CVE-2026-64182 [MEDIUM] Linux kernel (Azure FIPS) vulnerabilities
Title: Linux kernel (Azure FIPS) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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;
- PowerPC architecture;
- Compute Acceleration Framework;
- Drivers core;
- Bluetooth drivers;
- Arm Firmware Framework for ARMv8-A(FFA);
- EFI core;
- GPU drivers;
- Hardware monitoring drivers;
- InfiniBand drivers;
- Network drivers;
- SCSI subsystem;
- SPI subsystem;
- Network file systems library;
- NTFS3 file system;
- SMB network file system;
- File systems infrastructure;
- Software nodes and device properties;
- Bluetooth subsystem;
- Netfilter;
-
Ubuntu
Linux kernel (Azure) vulnerabilities
vendor_ubuntu·2026-09-15·CVSS 5.5
CVE-2026-64088 [MEDIUM] Linux kernel (Azure) vulnerabilities
Title: Linux kernel (Azure) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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;
- PowerPC architecture;
- Compute Acceleration Framework;
- Drivers core;
- Bluetooth drivers;
- Arm Firmware Framework for ARMv8-A(FFA);
- EFI core;
- GPU drivers;
- Hardware monitoring drivers;
- InfiniBand drivers;
- Network drivers;
- SCSI subsystem;
- SPI subsystem;
- Network file systems library;
- NTFS3 file system;
- SMB network file system;
- File systems infrastructure;
- Software nodes and device properties;
- Bluetooth subsystem;
- Netfilter;
- Trac
Ubuntu
Linux kernel (GCP) vulnerabilities
vendor_ubuntu·2026-09-07·CVSS 9.1
CVE-2026-52938 [CRITICAL] Linux kernel (GCP) vulnerabilities
Title: Linux kernel (GCP) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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)
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)
Several security issues were disc
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-09-07·CVSS 5.5
CVE-2026-64182 [MEDIUM] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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;
- PowerPC architecture;
- Compute Acceleration Framework;
- Drivers core;
- Bluetooth drivers;
- Arm Firmware Framework for ARMv8-A(FFA);
- EFI core;
- GPU drivers;
- Hardware monitoring drivers;
- InfiniBand drivers;
- Network drivers;
- Microsoft Azure Network Adapter (MANA) driver;
- SCSI subsystem;
- SPI subsystem;
- Network file systems library;
- NTFS3 file system;
- SMB network file system;
- File systems infrastructure;
- Software nodes and device properties;
-
Ubuntu
Linux kernel (NVIDIA) vulnerabilities
vendor_ubuntu·2026-08-20·CVSS 7.0
CVE-2026-64234 [HIGH] 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 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)
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:
- x86 platform drivers;
- Cryptographic API;
- PSP security protocol;
- ARM32 architecture;
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- User-Mode Linux (UML);
- x
Ubuntu
Linux kernel (NVIDIA BaseOS) vulnerabilities
vendor_ubuntu·2026-08-20·CVSS 7.0
CVE-2026-64109 [HIGH] Linux kernel (NVIDIA BaseOS) vulnerabilities
Title: Linux kernel (NVIDIA BaseOS) vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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)
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:
- x86 platform drivers;
- Cryptographic API;
- PSP security protocol;
- ARM32 architecture;
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- User-Mode Linux (UM
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-07-28·CVSS 7.0
CVE-2026-64231 [HIGH] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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)
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:
- x86 platform drivers;
- Cryptographic API;
- PSP security protocol;
- ARM32 architecture;
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- User-Mode Linux (UML);
- x86 archit
Ubuntu
Linux kernel (Azure) vulnerabilities
vendor_ubuntu·2026-07-24·CVSS 2.0
CVE-2026-64107 [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)
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:
- x86 platfor
Ubuntu
Linux kernel vulnerabilities
vendor_ubuntu·2026-07-23·CVSS 7.0
CVE-2026-64107 [HIGH] Linux kernel vulnerabilities
Title: Linux kernel vulnerabilities
Summary: Several security issues were fixed in the Linux kernel.
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)
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:
- x86 platform drivers;
- PSP security protocol;
- ARM32 architecture;
- ARM64 architecture;
- MIPS architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- User-Mode Linux (UML);
- x86 architecture;
- Block layer
Red Hat
kernel: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
vendor_redhat·2026-07-19·CVSS 9.8
CVE-2026-64136 [CRITICAL] CWE-414 kernel: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
kernel: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
In the Linux kernel, the following vulnerability has been resolved:
smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
Commit 96c4af418586 ("cifs: Fix locking usage for tcon fields")
refactored cifs code to change cifs_tcp_ses_lock for tc_lock around
tc_count changes.
There was missing lock around tc_count increment inside
smb2_find_smb_sess_tcon_unlocked().
A flaw was found in the Linux kernel's Server Message Block (SMB) client. A missing lock around the `tc_count` increment in the `smb2_find_smb_sess_tcon_unlocked()` function creates a race condition. This vulnerability, caused by an incomplete refactoring of locking mechanisms, could lead to unexpected behavior.
Package:
GHSA
In the Linux kernel, the following vulnerability has been resolved: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked() Commit 96c4af418586 ("cifs: Fix locking usage for tc
ghsa_unreviewed·2026-07-19
CVE-2026-64136 [CRITICAL] In the Linux kernel, the following vulnerability has been resolved: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked() Commit 96c4af418586 ("cifs: Fix locking usage for tc
In the Linux kernel, the following vulnerability has been resolved:
smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
Commit 96c4af418586 ("cifs: Fix locking usage for tcon fields")
refactored cifs code to change cifs_tcp_ses_lock for tc_lock around
tc_count changes.
There was missing lock around tc_count increment inside
smb2_find_smb_sess_tcon_unlocked().
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/13fb413ae22a37c69341918a6d651d19a9b0b9b7https://git.kernel.org/stable/c/4d8690dace005a38e6dbde9ecce2da3ad85c7c41https://git.kernel.org/stable/c/7df1df6f40c0720d30206aa35c0343b962350e0dhttps://git.kernel.org/stable/c/bf4ebdb19ff9b3cdf992b50715fe61633327416ahttps://git.kernel.org/stable/c/e374f4e496fef8168784f93a4477d67be34485fd
2026-07-19
Published