CVE-2026-97557 Linux Kernel - Denial of Service

Linux kernel contains a reference count leak vulnerability in cifs_queue_oplock_break() caused by unconditional file reference increment before queueing work, letting attackers cause unmount failures, exploit requires interaction with slow-responding CIFS server.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.66% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
25 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for cifs_queue_oplock_break() reference leak.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

← All CVEs