CVE-2026-31663
xfrm: hold dev ref until after transport_finish NF_HOOK
- Published
- Updated
- Reserved
- Assigned by
- Linux
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| redhat-SADPADP (enrichment) | 3.1 | High7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.22% · top 87% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected acf568ee859f098279eadf551612f103afdacb4e – < 4d06caedea587c59cc2cc893ceecc57c75c64312
- affected acf568ee859f098279eadf551612f103afdacb4e – < 94439cbe478b53f92223da9aae95fffb28623c3f
- affected acf568ee859f098279eadf551612f103afdacb4e – < 4236c30b437b80f673b9e08c8fae38b8d471ac9e
- affected acf568ee859f098279eadf551612f103afdacb4e – < 0f451b43c88bf2b9c038b414be580efee42e031b
- affected acf568ee859f098279eadf551612f103afdacb4e – < 5002beda5cac69d522dc54da0d5d463ed9c963d2
- affected acf568ee859f098279eadf551612f103afdacb4e – < 1c428b03840094410c5fb6a5db30640486bbbfcb
- affected 69895c5ea0ca2e8d7de1e6d36965d0ab9730787f
- affected 833760100588acfb267dac4d6a02ab9931237739
- affected e095ecaec6d94aa2156cceb98a85d409b51190f3
- affected 3.2.100 – < 3.3
- affected 3.16.55 – < 3.17
- affected 4.14.24 – < 4.15
- affected 4.15
- unaffected < 4.15
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.160 – ≤ 6.6.*
- unaffected 6.12.94 – ≤ 6.12.*
- unaffected 6.18.23 – ≤ 6.18.*
- unaffected 6.19.13 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References (13)
- https://git.kernel.org/stable/c/4d06caedea587c59cc2cc893ceecc57c75c64312 (opens in a new tab)
- https://git.kernel.org/stable/c/94439cbe478b53f92223da9aae95fffb28623c3f (opens in a new tab)
- https://git.kernel.org/stable/c/4236c30b437b80f673b9e08c8fae38b8d471ac9e (opens in a new tab)
- https://git.kernel.org/stable/c/0f451b43c88bf2b9c038b414be580efee42e031b (opens in a new tab)
- https://git.kernel.org/stable/c/5002beda5cac69d522dc54da0d5d463ed9c963d2 (opens in a new tab)
- https://git.kernel.org/stable/c/1c428b03840094410c5fb6a5db30640486bbbfcb (opens in a new tab)
- https://access.redhat.com/security/cve/CVE-2026-31663 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2461462 (opens in a new tab)issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31663.json (opens in a new tab)x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:67471 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:68570 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:68531 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:68532 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://trackcve.app/cve/CVE-2026-31663)Record last updated .