Memory leak in Linux kernel - CVE-2026-97556
Published: September 28, 2026
Vulnerability identifier: #VU152645
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-97556
CWE-ID: CWE-401
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a missing reference count release in cifs_oplock_break() in the SMB client when handling an oplock break after cifs_sb_tlink() fails. A local user can trigger an oplock break that encounters a cifs_sb_tlink() failure to cause a denial of service.
Only SMB mounts using the multiuser option are affected.
Affected software
Linux kernel
How to mitigate CVE-2026-97556
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3