# tipc: avoid busy looping in tipc_exit_net()

CVE record · `CVE-2026-80866`

- **Identifiers:** `CVE-2026-80866`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 4 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 4 Sept 2026, 16:48 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: `04c26faa51d1e2fe71cf13c45791f5174c37f986 to before 772769859226a5b004442403510acb58a1c32e72` (git)
  - affected: `04c26faa51d1e2fe71cf13c45791f5174c37f986 to before 99b82c8452887408ea908fdfa5df33c4a5dfa88f` (git)
  - affected: `04c26faa51d1e2fe71cf13c45791f5174c37f986 to before 110bb16d37bdba03213156c0df37e7119c190936` (git)
  - affected: `04c26faa51d1e2fe71cf13c45791f5174c37f986 to before 7672973957e3e20780afe5937a9fec70b72bc060` (git)
  - affected: `04c26faa51d1e2fe71cf13c45791f5174c37f986 to before 522d1d950b9e3b68190a6de7534827c8dccedb73` (git)
  - affected: `04c26faa51d1e2fe71cf13c45791f5174c37f986 to before c1481c94e74c955e0448ddf46b8615a44d840c1e` (git)
  - affected: `d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa` (git)
  - affected: `5195ec5e365a2a9331bfeb585b613a6e94f98dba` (git)
  - affected: `b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d` (git)
  - affected: `5.4.124 to before 5.5` (semver)
  - affected: `5.10.42 to before 5.11` (semver)
  - affected: `5.12.9 to before 5.13` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.13`
  - unaffected: `before 5.13` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.57 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.5 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2 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 versions from 5.13 before the fixed releases have a TIPC networking flaw in which network namespace teardown busy-waits, wasting CPU and possibly causing soft lockups. The source does not describe what an attacker would need to trigger it. Upgrade to 6.1.191, 6.6.160, 6.12.114, or 6.18.57 or later in the respective series.

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:** 0.0020, the 9th 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 4 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-80866](https://www.cve.org/CVERecord?id=CVE-2026-80866)
- [NVD: CVE-2026-80866](https://nvd.nist.gov/vuln/detail/CVE-2026-80866)

### References from the CNA

- <https://git.kernel.org/stable/c/772769859226a5b004442403510acb58a1c32e72>
- <https://git.kernel.org/stable/c/99b82c8452887408ea908fdfa5df33c4a5dfa88f>
- <https://git.kernel.org/stable/c/110bb16d37bdba03213156c0df37e7119c190936>
- <https://git.kernel.org/stable/c/7672973957e3e20780afe5937a9fec70b72bc060>
- <https://git.kernel.org/stable/c/522d1d950b9e3b68190a6de7534827c8dccedb73>
- <https://git.kernel.org/stable/c/c1481c94e74c955e0448ddf46b8615a44d840c1e>

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-2026-80866>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80866/>. Everything for agents: <https://agentprime.io/llms.txt>.