CVE-2023-53751
A bug in the Linux kernel’s CIFS module could let an attacker free memory that is still in use, potentially crashing the system or allowing code execution. The flaw involves the hostname field of TCP_Server_Info being updated during reconnection. It has been fixed in a kernel update.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel, CIFS (Common Internet File System) module – all versions before the patch that fixed the use‑after‑free bug.
Real-world impact
An attacker could cause the system to crash or, in the worst case, run arbitrary code, leading to denial of service or privilege escalation.
Why this severity
The CVSS score of 9.8 reflects that the vulnerability can be exploited remotely without authentication or user interaction, and it compromises confidentiality, integrity, and availability of the affected system.
What to do about it
- 01Upgrade your Linux kernel to a version that includes the CIFS use‑after‑free fix.
- 02Reboot the system to load the updated kernel.
NVD description
Timeline
- Dec 8, 2025 · Dec 8, 2025PublishedDisclosed and added to the National Vulnerability Database.
- Aug 4, 2026 · 1d agoAdvisory updatedThe NVD record was last revised.
- Aug 4, 2026 · 1d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.