SB20260502144 - Out-of-bounds read in Linux kernel smb client
Published: May 2, 2026
Security Bulletin ID
SB20260502144
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Information disclosure
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2026-31708)
CWE-ID: CWE-125 - Out-of-bounds read
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in smb2_ioctl_query_info() when processing a crafted QUERY_INFO response from an SMB server. A remote attacker can return a malformed response with an OutputBufferLength larger than the actual response buffer to disclose sensitive information.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/078fae8f50adebb903ccf2252b44391324571e78
- https://git.kernel.org/stable/c/85fd46ee26a11841c670449508025965f61ce131
- https://git.kernel.org/stable/c/a34d456934fe42e4da5d2cc07787bf418bee99c6
- https://git.kernel.org/stable/c/a58c5af19ff0d6f44f6e9fe31e33a2c92223f77e
- https://git.kernel.org/stable/c/ac2f14e4705d020f04e806efa0d49ab8dc2b145f