CVE-2025-22077
A critical flaw in the Linux kernel’s CIFS client caused TCP sockets to hang in a state that could leak resources and lead to crashes. The bug was introduced by a commit that incorrectly stopped timers and was later reverted. The vulnerability is now fixed in recent kernel releases.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel 6.13 and 6.15 (and other 6.x releases) on systems that use the CIFS/SMB client.
Real-world impact
An attacker could force the system to run out of network sockets or crash, potentially allowing them to take control of the machine.
Why this severity
The CVSS score of 9.8 reflects that the flaw can be triggered by an unauthenticated attacker, causes a denial of service, and may lead to arbitrary code execution because it affects all users of the CIFS client without any user interaction.
What to do about it
- 01Upgrade your Linux kernel to a version that includes the revert of commit e9f2517a3e18 (e.g., kernel 6.13 or later).
- 02Reboot the system or restart networking services to load the updated kernel.
NVD description
Timeline
- Apr 16, 2025 · Apr 16, 2025PublishedDisclosed and added to the National Vulnerability Database.
- Jul 30, 2026 · 7d agoAdvisory updatedThe NVD record was last revised.
- Jul 30, 2026 · 6d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.