# can: isotp: fix tx.buf use-after-free in isotp_sendmsg()

CVE record · `CVE-2026-31474`

- **Identifiers:** `CVE-2026-31474`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Weakness (CWE):** [CWE-364](https://cwe.mitre.org/data/definitions/364.html) · [CWE-416](https://cwe.mitre.org/data/definitions/416.html)
- **Tags:** [Memory corruption](https://agentprime.io/advisories/tag/memory-corruption.md) · [CWE-364](https://agentprime.io/advisories/tag/cwe-364.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 22 Apr 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 22 Apr 2026, 13:54 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: `96d1c81e6a0478535342dff6c730adb076cd84e8 to before cb3d6efa78460e6d50bf68806d0db66265709f64` (git)
  - affected: `96d1c81e6a0478535342dff6c730adb076cd84e8 to before 9649d051e54413049c009638ec1dc23962c884a4` (git)
  - affected: `96d1c81e6a0478535342dff6c730adb076cd84e8 to before eec8a1b18a79600bd4419079dc0026c1db72a830` (git)
  - affected: `96d1c81e6a0478535342dff6c730adb076cd84e8 to before 2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c` (git)
  - affected: `96d1c81e6a0478535342dff6c730adb076cd84e8 to before 424e95d62110cdbc8fd12b40918f37e408e35a92` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.4`
  - unaffected: `before 6.4` (semver)
  - unaffected: `6.6.131 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.80 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.21 to 6.18.*, inclusive` (semver)
  - unaffected: `6.19.11 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)
- 7.8 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`, from ADP (redhat-SADP)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0010, the 1st 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 22 Apr 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-31474](https://www.cve.org/CVERecord?id=CVE-2026-31474)
- [NVD: CVE-2026-31474](https://nvd.nist.gov/vuln/detail/CVE-2026-31474)

### References from the CNA

- <https://git.kernel.org/stable/c/cb3d6efa78460e6d50bf68806d0db66265709f64>
- <https://git.kernel.org/stable/c/9649d051e54413049c009638ec1dc23962c884a4>
- <https://git.kernel.org/stable/c/eec8a1b18a79600bd4419079dc0026c1db72a830>
- <https://git.kernel.org/stable/c/2e62e7051eca75a7f2e3d52d62ec10d7d7aa358c>
- <https://git.kernel.org/stable/c/424e95d62110cdbc8fd12b40918f37e408e35a92>

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-2026-31474>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-31474/>. Everything for agents: <https://agentprime.io/llms.txt>.