CVE-2026-31663xfrm: hold dev ref until after transport_finish NF_HOOK
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-826
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from acf568ee859f098279eadf551612f103afdacb4e before 4236c30b437b80f673b9e08c8fae38b8d471ac9e; from acf568ee859f098279eadf551612f103afdacb4e before 0f451b43c88bf2b9c038b414be580efee42e031b; from acf568ee859f098279eadf551612f103afdacb4e before 5002beda5cac69d522dc54da0d5d463ed9c963d2; from acf568ee859f098279eadf551612f103afdacb4e before 1c428b03840094410c5fb6a5db30640486bbbfcb; 69895c5ea0ca2e8d7de1e6d36965d0ab9730787f; 833760100588acfb267dac4d6a02ab9931237739; e095ecaec6d94aa2156cceb98a85d409b51190f3; from 3.2.100 before 3.3; and 2 more ranges | CNA record |
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux | from 0:6.12.0-211.55.1.el10_2 not affected | CISA ADP |
linux linux_kernel linux:linux_kernel | from 3.2.100 before 3.3; from 3.16.55 before 3.17; from 4.14.24 before 4.15; from 4.15.1 before 6.18.23; from 6.19 before 6.19.13; 4.15; 7.0; 7.0; and 5 more ranges | NVD |
References
- https://git.kernel.org/stable/c/4236c30b437b80f673b9e08c8fae38b8d471ac9e
- https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031bpatch
- https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2patch
- https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcbpatch
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.