CVEvulnerability
CVE-2026-74521
9.1 CRITICAL
Official page ↗
- Status
- Received
- Published
- 2026-08-15
- Last modified
- 2026-10-03
- Assigner
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
- CVSS 3.1 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)
- 9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Description
In the Linux kernel, the following vulnerability has been resolved:
ksmbd: use memcmp() to compare ClientGUIDs
ClientGUID is a fixed-size binary value and can contain embedded NUL
bytes. strncmp() stops comparing at the first NUL byte, so different
ClientGUID values can incorrectly be treated as equal.
Use memcmp() in SMB3 multichannel session binding and
FSCTL_VALIDATE_NEGOTIATE_INFO to compare all SMB2_CLIENT_GUID_SIZE
bytes.
References
- https://git.kernel.org/stable/c/5a0367bf5ce420be7b19936def2e90adcf32a683 git.kernel.org
- https://git.kernel.org/stable/c/7bde6f181fa307d2cc1ec2b0313ac8e9811c8232 git.kernel.org
- https://git.kernel.org/stable/c/a386c83043015a703e227775f778e40343f45911 git.kernel.org
- https://git.kernel.org/stable/c/ba2a5b66f1d414eb8403d655f8813783892cfc85 git.kernel.org
- https://git.kernel.org/stable/c/d535363299822c5caa543787b21bd5cfa3e41949 git.kernel.org
- https://git.kernel.org/stable/c/e8bb506e6ef749ac0336f3e579d8d02396b7d832 git.kernel.org