CVE-2026-64319
published 2026-07-25CVE-2026-64319: In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: validate reply message payload bounds against transfer length…
PriorityP258critical9.1CVSS 3.1
AVNACLPRNUINSUCHINAH
EPSS
0.52%
43.6th percentile
In the Linux kernel, the following vulnerability has been resolved:
nvmet-auth: validate reply message payload bounds against transfer length
nvmet_auth_reply() accesses the variable-length rval[] array using
attacker-controlled hl (hash length) and dhvlen (DH value length) fields
without verifying they fit within the allocated buffer of tl bytes.
A malicious NVMe-oF initiator can craft a DHCHAP_REPLY message with a
small transfer length but large hl/dhvlen values, causing out-of-bounds
heap reads when the target processes the DH public key (rval + 2*hl) or
performs the host response memcmp.
With DH authentication configured, the OOB pointer is passed directly to
sg_init_one() and read by crypto_kpp_compute_shared_secret(), reaching
up to 526 bytes past the buffer. This is exploitable pre-authentication.
Add bounds validation ensuring sizeof(*data) + 2*hl + dhvlen <= tl before
any access to the variable-length fields.
Discovered by Atuin - Automated Vulnerability Discovery Engine.
Affected
36 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0 | 80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0 |
| linux | linux | >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 999f6205ede984a786f35f727b01f971b98e215d | 999f6205ede984a786f35f727b01f971b98e215d |
| linux | linux | >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 6d7649c1231dac14d906985d2936967e23041c26 | 6d7649c1231dac14d906985d2936967e23041c26 |
| linux | linux | >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < caa71b3a43ea5c13fe7141cb019ebcb03b8ac857 | caa71b3a43ea5c13fe7141cb019ebcb03b8ac857 |
| linux | linux | >= db1312dd95488b5e6ff362ff66fcf953a46b1821 < 3a413ece2504c70aa34a20be4dafec04e8c741f9 | 3a413ece2504c70aa34a20be4dafec04e8c741f9 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 6.0 < 6.6.145 | 6.6.145 |
| linux | linux_kernel | >= 6.13 < 6.18.39 | 6.18.39 |
| linux | linux_kernel | >= 6.19 < 7.1.4 | 7.1.4 |
| linux | linux_kernel | >= 6.7 < 6.12.96 | 6.12.96 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-7.0 | — | — |
| ubuntu | linux-aws-fips | — | — |
| ubuntu | linux-azure | — | — |
| ubuntu | linux-azure-7.0 | — | — |
| ubuntu | linux-azure-fde | — | — |
| ubuntu | linux-azure-fips | — | — |
| ubuntu | linux-fips | — | — |
| ubuntu | linux-gcp | — | — |
| ubuntu | linux-gcp-7.0 | — | — |
| ubuntu | linux-gcp-fips | — | — |
| ubuntu | linux-gke | — | — |
| ubuntu | linux-gkeop | — | — |
CVSS provenance
nvdv3.19.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
vendor_redhat9.1CRITICAL
vendor_ubuntu9.1CRITICAL
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An attacker could possibly use these to compromise the system.
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- ARM64 architecture;
- RISC-V architecture;
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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
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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;
- RISC-V architecture;
- S390 architecture;
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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:
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- User-space API (UAPI);
- Kernel build system;
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- RISC-V architecture;
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Red Hat
kernel: nvmet-auth: validate reply message payload bounds against transfer length
vendor_redhat·2026-07-25·CVSS 9.1
CVE-2026-64319 [CRITICAL] CWE-125 kernel: nvmet-auth: validate reply message payload bounds against transfer length
kernel: nvmet-auth: validate reply message payload bounds against transfer length
A flaw was found in the Linux kernel's nvmet-auth component. A remote attacker, by sending a specially crafted NVMe-oF (NVMe over Fabrics) authentication reply message, can cause an out-of-bounds read in the kernel's memory. This vulnerability, exploitable pre-authentication, can lead to the disclosure of sensitive information and potentially a denial of service (DoS) on the affected system.
Package: kernel (Red Hat Enterprise Linux 10) - Affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel (Red Hat Enterprise Linux 8) - Not affected
Package: kernel-
VulDB
Linux Kernel up to 6.6.144/6.12.95/6.18.38/7.1.3 nvmet-auth nvmet_auth_reply hl/dhvlen out-of-bounds
vuldb·2026-09-03·CVSS 9.1
CVE-2026-64319 [CRITICAL] Linux Kernel up to 6.6.144/6.12.95/6.18.38/7.1.3 nvmet-auth nvmet_auth_reply hl/dhvlen out-of-bounds
A vulnerability has been found in Linux Kernel up to 6.6.144/6.12.95/6.18.38/7.1.3 and classified as critical. Impacted is the function nvmet_auth_reply of the component nvmet-auth. This manipulation of the argument hl/dhvlen causes out-of-bounds read.
This vulnerability appears as CVE-2026-64319. The attack may be initiated remotely. There is no available exploit.
The affected component should be upgraded.
GHSA
In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: validate reply message payload bounds against transfer length nvmet_auth_reply() accesses the variable-length rval[] a
ghsa_unreviewed·2026-07-25
CVE-2026-64319 In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: validate reply message payload bounds against transfer length nvmet_auth_reply() accesses the variable-length rval[] a
In the Linux kernel, the following vulnerability has been resolved:
nvmet-auth: validate reply message payload bounds against transfer length
nvmet_auth_reply() accesses the variable-length rval[] array using
attacker-controlled hl (hash length) and dhvlen (DH value length) fields
without verifying they fit within the allocated buffer of tl bytes.
A malicious NVMe-oF initiator can craft a DHCHAP_REPLY message with a
small transfer length but large hl/dhvlen values, causing out-of-bounds
heap reads when the target processes the DH public key (rval + 2*hl) or
performs the host response memcmp.
With DH authentication configured, the OOB pointer is passed directly to
sg_init_one() and read by crypto_kpp_compute_shared_secret(), reaching
up to 526 bytes past the buffer. This is exploitable
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/3a413ece2504c70aa34a20be4dafec04e8c741f9https://git.kernel.org/stable/c/6d7649c1231dac14d906985d2936967e23041c26https://git.kernel.org/stable/c/80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0https://git.kernel.org/stable/c/999f6205ede984a786f35f727b01f971b98e215dhttps://git.kernel.org/stable/c/caa71b3a43ea5c13fe7141cb019ebcb03b8ac857
2026-07-25
Published