High 7.8Published Apr 24, 2026

CVE-2026-31663xfrm: hold dev ref until after transport_finish NF_HOOK

Updated under an hour ago (Oct 28, 2026, 12:00 AM ET)

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Exploited in the last 30 days

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, CWE-416
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 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from acf568ee859f098279eadf551612f103afdacb4e before 94439cbe478b53f92223da9aae95fffb28623c3f; from acf568ee859f098279eadf551612f103afdacb4e before 4236c30b437b80f673b9e08c8fae38b8d471ac9e; from acf568ee859f098279eadf551612f103afdacb4e before 0f451b43c88bf2b9c038b414be580efee42e031b; from acf568ee859f098279eadf551612f103afdacb4e before 5002beda5cac69d522dc54da0d5d463ed9c963d2; from acf568ee859f098279eadf551612f103afdacb4e before 1c428b03840094410c5fb6a5db30640486bbbfcb; 69895c5ea0ca2e8d7de1e6d36965d0ab9730787f; 833760100588acfb267dac4d6a02ab9931237739; e095ecaec6d94aa2156cceb98a85d409b51190f3; and 3 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

References

https://git.kernel.org/stable/c/94439cbe478b53f92223da9aae95fffb28623c3f
https://git.kernel.org/stable/c/4236c30b437b80f673b9e08c8fae38b8d471ac9e
https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b	patch
https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2	patch
https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb	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
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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.