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Vulnerability record · CVE-2026-31663 · published 24 April 2026

CVE-2026-31663: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.13% · top 97.7% CWE-826 · CWE-826
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
11References
18 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b Patch
https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb Patch
https://git.kernel.org/stable/c/4236c30b437b80f673b9e08c8fae38b8d471ac9e
https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2 Patch
https://access.redhat.com/errata/RHSA-2026:67471
https://access.redhat.com/errata/RHSA-2026:68531
https://access.redhat.com/errata/RHSA-2026:68532
https://access.redhat.com/errata/RHSA-2026:68570
https://access.redhat.com/security/cve/CVE-2026-31663
https://bugzilla.redhat.com/show_bug.cgi?id=2461462
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31663.json

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Source: NIST National Vulnerability Database (record CVE-2026-31663), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.