# vlan: fix skb_under_panic and races when toggling HW VLAN offload

CVE record · `CVE-2026-80925`

- **Identifiers:** `CVE-2026-80925`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 9 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 9 Sept 2026, 16:19 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: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 69f2fc6e761ee68a4c0c8e416ae88c573d4d7319` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before b38d7a4bc9c17e1d437696da25f9fbc286614d9d` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before b30fe4de285b9bdaf9508740191f69f7cd83b8fa` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 1517d1996b5236fe69eccd9d253f725e06996eb1` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a29f3b884ba50217e6f50414f568073221e2bb07` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 447cbe95ebb95392b5d8f6a01c0556826919ce23` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.12`
  - unaffected: `before 2.6.12` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.3 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 VLAN devices are affected from 2.6.12 before the fixes in the listed stable branches, and the source gives few details beyond the description. Toggling hardware VLAN TX offload on a lower device could change a VLAN device's header length while other code read it without locking, which could cause a kernel panic (skb_under_panic) when headers are built. The advisory does not state an attacker requirement or privilege level. Upgrade to a fixed kernel release for your branch; the CNA lists fixed versions from 6.1.191, 6.6.158, 6.12.111, and 6.18.51 onward.

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

No source has published a CVSS score for this record yet.

- **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 9 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-80925](https://www.cve.org/CVERecord?id=CVE-2026-80925)
- [NVD: CVE-2026-80925](https://nvd.nist.gov/vuln/detail/CVE-2026-80925)

### References from the CNA

- <https://git.kernel.org/stable/c/69f2fc6e761ee68a4c0c8e416ae88c573d4d7319>
- <https://git.kernel.org/stable/c/b38d7a4bc9c17e1d437696da25f9fbc286614d9d>
- <https://git.kernel.org/stable/c/b30fe4de285b9bdaf9508740191f69f7cd83b8fa>
- <https://git.kernel.org/stable/c/1517d1996b5236fe69eccd9d253f725e06996eb1>
- <https://git.kernel.org/stable/c/a29f3b884ba50217e6f50414f568073221e2bb07>
- <https://git.kernel.org/stable/c/447cbe95ebb95392b5d8f6a01c0556826919ce23>

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-2026-80925>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80925/>. Everything for agents: <https://agentprime.io/llms.txt>.