SB20260425104 - Out-of-bounds read in Linux kernel smb client

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds read (CVE-ID: CVE-2026-31614)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/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 check_wsl_eas() when processing extended attribute data from an SMB server response. A remote attacker can send a specially crafted server response to disclose sensitive information.

The issue can leak up to 8 bytes of kernel heap memory and can influence which WSL xattr the data is interpreted as.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/5cc0574c84aa73946ade587c41e81757b8b01cb5
• https://git.kernel.org/stable/c/a893f1757d9a4009e4a8d7ceb2312142fe29cea4
• https://git.kernel.org/stable/c/b2b76d09a64c538c57006180103fc1841e8cfa66
• https://git.kernel.org/stable/c/ba3ad159aa61810bbe0acaf39578b1ebfb6f1a18