Use of uninitialized resource in Linux kernel - CVE-2026-97554
Published: September 28, 2026
Vulnerability identifier: #VU152659
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-2026-97554
CWE-ID: CWE-908
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-97554
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3