Premature Release of Resource During Expected Lifetime The advisory has been revoked - it doesn't affect any version of package kernel (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS6-KERNEL-16292512
- published25 Apr 2026
- disclosed24 Apr 2026
Introduced: 24 Apr 2026
CVE-2026-31663 (opens in a new tab)Amendment
The Centos security team deemed this advisory irrelevant for Centos:6.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by Centos.
In the Linux kernel, the following vulnerability has been resolved:
xfrm: hold dev ref until after transport_finish NF_HOOK
After async crypto completes, xfrm_input_resume() calls dev_put() immediately on re-entry before the skb reaches transport_finish. The skb->dev pointer is then used inside NF_HOOK and its okfn, which can race with device teardown.
Remove the dev_put from the async resumption entry and instead drop the reference after the NF_HOOK call in transport_finish, using a saved device pointer since NF_HOOK may consume the skb. This covers NF_DROP, NF_QUEUE and NF_STOLEN paths that skip the okfn.
For non-transport exits (decaps, gro, drop) and secondary async return points, release the reference inline when async is set.
References
- https://access.redhat.com/security/cve/CVE-2026-31663
- https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b
- https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb
- https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2
- https://git.kernel.org/stable/c/4236c30b437b80f673b9e08c8fae38b8d471ac9e
- https://bugzilla.redhat.com/show_bug.cgi?id=2461462
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31663.json