CVE-2026-53227

Description

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix possible kfree_skb of ERR_PTR After the patch in the "Fixes" tag, the allocation of the "reply" skb can happen either before or after locking the ovs_mutex. However, error cleanups still follow the classical reversed order, assuming "reply" is allocated before locking: it is freed after unlocking. If "reply" allocation happens after locking the mutex and it fails, "reply" is left with an ERR_PTR, and execution jumps to the correspondent cleanup stage which will try to free an invalid pointer. Fix this by setting the pointer to NULL after having saved its error value.

EPSS — Exploit Prediction

0.0014

Probability of exploitation

0.03%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/0bb5b2dc1b90aa7dd1473fc8c4d813a29255ff8d https://git.kernel.org/stable/c/25fdf53698535fe8790237f5a8a9626791429785 https://git.kernel.org/stable/c/895d1dd9057cde1687fa0f4286d47ceed0b82997 https://git.kernel.org/stable/c/971b1b37774f13acc5add0a2843f8598446b8598 https://git.kernel.org/stable/c/e248fb2e680deb2bd37bac551b72638fe4938a76 https://git.kernel.org/stable/c/e3d509a1b71396e1452060dbf84a805fd1c3c549 https://git.kernel.org/stable/c/ecc55aad3390129a87106841f4b68bf3d70c9264 https://git.kernel.org/stable/c/ee30dd2909d8b98619f4341c70ec8dc8e155ab02

Frequently Asked Questions

What is CVE-2026-53227? +

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix possible kfree_skb of ERR_PTR After the patch in the "Fixes" tag, the allocation of the "reply" skb can happen either before or after locking the ovs_mutex. However, error cleanups still follow the classical reversed order, assuming "reply" is allocated before locking: it is freed after unlocking. If "reply" allocation happens after locking the mutex and it fails, "reply" is left with an ERR_PTR, and execution jumps to the correspondent cleanup stage which will try to free an invalid pointer. Fix this by setting the pointer to NULL after having saved its error value.

How do I check if I'm vulnerable to CVE-2026-53227? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Description

EPSS — Exploit Prediction

References

Other References

Frequently Asked Questions

Don't wait for an exploit