# net: ravb: serialize PTP clock teardown

CVE record · `CVE-2026-80991`

- **Identifiers:** `CVE-2026-80991`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:42 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: `a0d2f20650e81407d8e51ad2cbdc492861c74e9c to before 0400b9c5608933289bcacc3886dd3e4f6b7695f1` (git)
  - affected: `a0d2f20650e81407d8e51ad2cbdc492861c74e9c to before b917f37bfcce919a969d66a044580a95b11df31c` (git)
  - affected: `a0d2f20650e81407d8e51ad2cbdc492861c74e9c to before 695acb5534a9e366efb47b40c7487fc56488b09b` (git)
  - affected: `a0d2f20650e81407d8e51ad2cbdc492861c74e9c to before 67a82e6f886beed0de8f8da08bb767e68fba952d` (git)
  - affected: `a0d2f20650e81407d8e51ad2cbdc492861c74e9c to before 66b50c31419e7946e9aa325a468ad9b64c961a25` (git)
  - affected: `a0d2f20650e81407d8e51ad2cbdc492861c74e9c to before 1cb9663789c5b7a12fcd419fcca6d6254c398252` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.2`
  - unaffected: `before 4.2` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.109 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.50 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.4 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Linux kernel's ravb network driver (Renesas Ethernet AVB) is vulnerable to a use-after-free during PTP clock teardown, where an interrupt handler can race with the clock being unregistered. The source gives few details on how an attacker would trigger it. The fix is to upgrade to a fixed kernel version: 4.2 and later versions before the listed fixes, or the stable releases 6.1.191, 6.6.160, 6.12.109, or 6.18.50 and their later updates. No workaround is listed.

Written 12 Nov 2026.

## 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)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0016, the 5th percentile, on 14 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 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-80991](https://www.cve.org/CVERecord?id=CVE-2026-80991)
- [NVD: CVE-2026-80991](https://nvd.nist.gov/vuln/detail/CVE-2026-80991)

### References from the CNA

- <https://git.kernel.org/stable/c/0400b9c5608933289bcacc3886dd3e4f6b7695f1>
- <https://git.kernel.org/stable/c/b917f37bfcce919a969d66a044580a95b11df31c>
- <https://git.kernel.org/stable/c/695acb5534a9e366efb47b40c7487fc56488b09b>
- <https://git.kernel.org/stable/c/67a82e6f886beed0de8f8da08bb767e68fba952d>
- <https://git.kernel.org/stable/c/66b50c31419e7946e9aa325a468ad9b64c961a25>
- <https://git.kernel.org/stable/c/1cb9663789c5b7a12fcd419fcca6d6254c398252>

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-2026-80991>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-80991/>. Everything for agents: <https://agentprime.io/llms.txt>.