CVE-2026-43376 - Vulnerability Analysis
CriticalCVSS: 9.8Last Updated: May 11, 2026
Linux kernel ksmbd - Use After Free
Published: May 8, 2026Updated: May 11, 2026Remote Exploitable
Overview
Linux kernel ksmbd contains a use-after-free vulnerability caused by immediate freeing of oplock_info without RCU grace period, letting attackers cause memory corruption or denial of service, exploit requires concurrent access to oplock_info.
Severity & Score
Severity: Critical
CVSS Score: 9.8
Impact
Attackers can cause memory corruption or denial of service by accessing freed memory.
Mitigation
Update to the latest Linux kernel version containing the fix using call_rcu() for oplock_info.
References
- https://git.kernel.org/stable/c/1dfd062caa165ec9d7ee0823087930f3ab8a6294
- https://git.kernel.org/stable/c/302fef75512b2c8329a3f5efab1ae7ba2562387a
- https://git.kernel.org/stable/c/ce8507ee82c888126d8e7565e27c016308d24cde
- https://git.kernel.org/stable/c/08aa9f3c8cf4d0bee44df540dfe34e8d64069f2c
- https://git.kernel.org/stable/c/1d6abf145615dbfe267ce3b0a271f95e3780e18e
Related Resources
Details
- CVE ID
- CVE-2026-43376
- Severity
- Critical
- CVSS Score
- 9.8
- Type
- use_after_free
- Status
- new
CVSS Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H