CVE-2026-31663 | BDVDB-2026-328902 Detail
LinuxLinux
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.
Impact#
Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact high. Attack vector: local.
Weaknesses#
References#
- https://git.kernel.org/stable/c/4d06caedea587c59cc2cc893ceecc57c75c64312
- https://git.kernel.org/stable/c/94439cbe478b53f92223da9aae95fffb28623c3f
- https://git.kernel.org/stable/c/4236c30b437b80f673b9e08c8fae38b8d471ac9e
- https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b
- https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2
- https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb
- 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
- https://access.redhat.com/errata/RHSA-2026:67471
- https://access.redhat.com/errata/RHSA-2026:68570
- https://access.redhat.com/errata/RHSA-2026:68531
- https://access.redhat.com/errata/RHSA-2026:68532
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.