CVE-2026-31663
MEDIUMDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U
Exploit Intelligence
Low risk: more likely to be exploited than 12% of all known CVEs.
References
Related Vulnerabilities
Other CWE-826 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2026-33526 | High | 7.5 | 8.9% | - | Fix |
| CVE-2026-32748 | High | 7.5 | 8.9% | - | Fix |
| CVE-2023-1297 | Medium | 4.9 | 0.8% | - | Fix |
| CVE-2025-24912 | Low | 3.7 | 0.7% | - | - |
| CVE-2025-31115 | High | - | 0.6% | - | Fix |
| CVE-2024-51727 | Medium | 6.5 | 0.5% | - | Fix |
Common questions
How do I fix CVE-2026-31663?
Upgrade linux on debian 13 to 6.12.94-1 or later.
Is CVE-2026-31663 being actively exploited?
Not that we know of. CVE-2026-31663 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.22% is the estimated probability that it will be exploited in the next 30 days. That is higher than 12% of all scored CVEs.
How severe is CVE-2026-31663?
CVE-2026-31663 has a CVSS v3 base score of 7.0, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-31663 affect?
Published advisories record a fix for linux (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
Embed a live status badge for CVE-2026-31663
Markdown
[](https://tridentstack.com/cve/CVE-2026-31663)HTML
<a href="https://tridentstack.com/cve/CVE-2026-31663"><img src="https://tridentstack.com/cve/badge/CVE-2026-31663.svg" alt="CVE-2026-31663"></a>Find and fix vulnerabilities across your fleet
TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.
This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-08-06.