SB20260928388 - Use of uninitialized resource in Linux kernel smb client

Description

This security bulletin contains information about 1 vulnerability.

1) Use of uninitialized resource (CVE-ID: CVE-2026-97554)

CWE-ID: CWE-908 - Use of Uninitialized Resource

CVSSv4: 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]

The vulnerability allows a remote attacker to disclose kernel stack contents to the userspace idmap daemon.

The vulnerability exists due to use of uninitialized stack memory in cifs_posix_to_fattr() when processing malformed POSIX directory entries containing invalid SID lengths from an untrusted server. A remote attacker can provide a malformed POSIX directory entry to cause uninitialized SID data to be processed.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/c9a8b60ce140a68d172452f418137fc7ddbae7db
• https://git.kernel.org/stable/c/da6e25842431982d5a53cf00d925b98c690f4467