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CVE-2026-72451

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 acq…

Published Aug 15, 2026EPSS 0.67%

Overview

CVE-2026-72451 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/041859fd55c81ea55e76d051e39b7b79975b8c7dRefgit.kernel.org/stable/c/6dab4dec9a49121d079981ac913569f232c06b06Refgit.kernel.org/stable/c/a1a3360a0c44b8b5c134db2a9d0667b61c9cf523Refgit.kernel.org/stable/c/ddd3d0132920319ac426e12456013eadbae67e15

How CyberStrike helps

Frequently asked questions

What is CVE-2026-72451?

CVE-2026-72451 is a critical-severity vulnerability. It was published on August 15, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-72451?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-72451?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-72451?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-72451 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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