CVE-2026-64319
nvmet-auth: validate reply message payload bounds against transfer length
Description
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.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Add bounds validation for variable-length fields.
- Ensure hl and dhvlen fit within transfer length.
- Apply the kernel patch for nvmet-auth.
- Update the Linux kernel.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64319.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64319 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64319
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64319 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64319 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': '80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0', 'versionType': 'git'}, {'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': '999f6205ede984a786f35f727b01f971b98e215d', 'versionType': 'git'}, {'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': '6d7649c1231dac14d906985d2936967e23041c26', 'versionType': 'git'}, {'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': 'caa71b3a43ea5c13fe7141cb019ebcb03b8ac857', 'versionType': 'git'}, {'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': '3a413ece2504c70aa34a20be4dafec04e8c741f9', 'versionType': 'git'}], 'programFiles': ['drivers/nvme/target/fabrics-cmd-auth.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/nvme/target/fabrics-cmd-auth.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': '80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0', 'versionType': 'git'}, {'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': '999f6205ede984a786f35f727b01f971b98e215d', 'versionType': 'git'}, {'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': '6d7649c1231dac14d906985d2936967e23041c26', 'versionType': 'git'}, {'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': 'caa71b3a43ea5c13fe7141cb019ebcb03b8ac857', 'versionType': 'git'}, {'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': '3a413ece2504c70aa34a20be4dafec04e8c741f9', 'versionType': 'git'}], 'programFiles': ['drivers/nvme/target/fabrics-cmd-auth.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/nvme/target/fabrics-cmd-auth.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': '80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0', 'versionType': 'git'}, {'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': '999f6205ede984a786f35f727b01f971b98e215d', 'versionType': 'git'}, {'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': '6d7649c1231dac14d906985d2936967e23041c26', 'versionType': 'git'}, {'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': 'caa71b3a43ea5c13fe7141cb019ebcb03b8ac857', 'versionType': 'git'}, {'status': 'affected', 'version': 'db1312dd95488b5e6ff362ff66fcf953a46b1821', 'lessThan': '3a413ece2504c70aa34a20be4dafec04e8c741f9', 'versionType': 'git'}], 'programFiles': ['drivers/nvme/target/fabrics-cmd-auth.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.96', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/nvme/target/fabrics-cmd-auth.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/3a413ece2504c70aa34a20be4dafec04e8c741f9 Added Reference https://git.kernel.org/stable/c/6d7649c1231dac14d906985d2936967e23041c26 Added Reference https://git.kernel.org/stable/c/80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0 Added Reference https://git.kernel.org/stable/c/999f6205ede984a786f35f727b01f971b98e215d Added Reference https://git.kernel.org/stable/c/caa71b3a43ea5c13fe7141cb019ebcb03b8ac857