Out-of-bounds read in Linux kernel - CVE-2026-64319
Published: July 27, 2026
Vulnerability identifier: #VU139657
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64319
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in nvmet_auth_reply() when processing a crafted DHCHAP_REPLY message. A remote attacker can send a specially crafted authentication reply message with inconsistent hash and DH value lengths to disclose sensitive information.
Exploitation is possible pre-authentication when DH authentication is configured.
Affected software
Linux kernel
How to mitigate CVE-2026-64319
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
External References
- https://git.kernel.org/stable/c/3a413ece2504c70aa34a20be4dafec04e8c741f9
- https://git.kernel.org/stable/c/6d7649c1231dac14d906985d2936967e23041c26
- https://git.kernel.org/stable/c/80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0
- https://git.kernel.org/stable/c/999f6205ede984a786f35f727b01f971b98e215d
- https://git.kernel.org/stable/c/caa71b3a43ea5c13fe7141cb019ebcb03b8ac857