Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix xfrm state cache insertion race The xfrm input state cache insertion code checks the validity of the state before acquiring the global xfrm_state_lock. Thus it's possible for someone else to kill the state after it passed the validity check, and then the insertion will add the dead state to the cache. Fix this by moving the validity check inside the lock. This entire function is called on the input path, where BH must be off (e.g., the caller of this function xfrm_input acquires its spinlocks without disabling BH). So there is no need to disable BH here or take the RCU read lock. Remove both and replace them with an assertion that trips if BH is accidentally enabled on some future calling path.
CVSS Score
CRITICAL
References
- https://git.kernel.org/stable/c/041859fd55c81ea55e76d051e39b7b79975b8c7d
- https://git.kernel.org/stable/c/6dab4dec9a49121d079981ac913569f232c06b06
- https://git.kernel.org/stable/c/a1a3360a0c44b8b5c134db2a9d0667b61c9cf523
- https://git.kernel.org/stable/c/ddd3d0132920319ac426e12456013eadbae67e15
FAQ
What is CVE-2026-72451?
CVE-2026-72451 is a vulnerability with a CVSS score of 9.8 (CRITICAL). In the Linux kernel, the following vulnerability has been resolved: xfrm: Fix xfrm state cache insertion race The xfrm input state cache insertion code checks the validity of the state before acquir...
How severe is CVE-2026-72451?
CVE-2026-72451 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-72451?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.