# xfrm: hold dev ref until after transport_finish NF_HOOK

CVE record · `CVE-2026-31663`

- **Identifiers:** `CVE-2026-31663`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Weakness (CWE):** [CWE-416](https://cwe.mitre.org/data/definitions/416.html) · [CWE-826](https://cwe.mitre.org/data/definitions/826.html)
- **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md) · [CWE-826](https://agentprime.io/advisories/tag/cwe-826.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 24 Apr 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 24 Apr 2026, 14:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `acf568ee859f098279eadf551612f103afdacb4e to before 4d06caedea587c59cc2cc893ceecc57c75c64312` (git)
  - affected: `acf568ee859f098279eadf551612f103afdacb4e to before 94439cbe478b53f92223da9aae95fffb28623c3f` (git)
  - affected: `acf568ee859f098279eadf551612f103afdacb4e to before 4236c30b437b80f673b9e08c8fae38b8d471ac9e` (git)
  - affected: `acf568ee859f098279eadf551612f103afdacb4e to before 0f451b43c88bf2b9c038b414be580efee42e031b` (git)
  - affected: `acf568ee859f098279eadf551612f103afdacb4e to before 5002beda5cac69d522dc54da0d5d463ed9c963d2` (git)
  - affected: `acf568ee859f098279eadf551612f103afdacb4e to before 1c428b03840094410c5fb6a5db30640486bbbfcb` (git)
  - affected: `69895c5ea0ca2e8d7de1e6d36965d0ab9730787f` (git)
  - affected: `833760100588acfb267dac4d6a02ab9931237739` (git)
  - affected: `e095ecaec6d94aa2156cceb98a85d409b51190f3` (git)
  - affected: `3.2.100 to before 3.3` (semver)
  - affected: `3.16.55 to before 3.17` (semver)
  - affected: `4.14.24 to before 4.15` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.15`
  - unaffected: `before 4.15` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.94 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.23 to 6.18.*, inclusive` (semver)
  - unaffected: `6.19.13 to 6.19.*, inclusive` (semver)
  - unaffected: `7.0 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 7.8 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from CNA (Linux) (used for this record)
- 7.0 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H`, from ADP (redhat-SADP)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0022, the 13th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 24 Apr 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-31663](https://www.cve.org/CVERecord?id=CVE-2026-31663)
- [NVD: CVE-2026-31663](https://nvd.nist.gov/vuln/detail/CVE-2026-31663)

### References from the CNA

- <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>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-31663>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-31663/>. Everything for agents: <https://agentprime.io/llms.txt>.