# sctp: fix NULL deref on untransmitted RECONF completion

CVE record · `CVE-2026-89477`

- **Identifiers:** `CVE-2026-89477`
- **State:** Confirmed
- **Severity:** CVSS 7.5 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:43 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: `81054476453640159149cb6704e834893e16736b to before 79ff751311e80fa0370007e46a79a6d601685e75` (git)
  - affected: `81054476453640159149cb6704e834893e16736b to before 53141db979687eae7dc6d29414cefc77034f967e` (git)
  - affected: `81054476453640159149cb6704e834893e16736b to before 68891125af5a5dfbca728809a16637a869bbe0df` (git)
  - affected: `81054476453640159149cb6704e834893e16736b to before b2d6d873b4dfb5b84194061c4b40a1cd85b92ca4` (git)
  - affected: `81054476453640159149cb6704e834893e16736b to before 77ea60f2d24002c308f224db44a4542c466489af` (git)
  - affected: `81054476453640159149cb6704e834893e16736b to before 25419f516ea84b1e7d3d55aae5215ac86ece0c66` (git)
  - affected: `81054476453640159149cb6704e834893e16736b to before 0ee697defc0594f1da810ed75d9d643fb46f5318` (git)
  - affected: `81054476453640159149cb6704e834893e16736b to before 2db9bfa3e27bdea15e05ea70b56bad3d21e570ec` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.11`
  - unaffected: `before 4.11` (semver)
  - unaffected: `5.10.270 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.221 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 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

## 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

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0050, the 43rd 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-2026-89477](https://www.cve.org/CVERecord?id=CVE-2026-89477)
- [NVD: CVE-2026-89477](https://nvd.nist.gov/vuln/detail/CVE-2026-89477)

### References from the CNA

- <https://git.kernel.org/stable/c/79ff751311e80fa0370007e46a79a6d601685e75>
- <https://git.kernel.org/stable/c/53141db979687eae7dc6d29414cefc77034f967e>
- <https://git.kernel.org/stable/c/68891125af5a5dfbca728809a16637a869bbe0df>
- <https://git.kernel.org/stable/c/b2d6d873b4dfb5b84194061c4b40a1cd85b92ca4>
- <https://git.kernel.org/stable/c/77ea60f2d24002c308f224db44a4542c466489af>
- <https://git.kernel.org/stable/c/25419f516ea84b1e7d3d55aae5215ac86ece0c66>
- <https://git.kernel.org/stable/c/0ee697defc0594f1da810ed75d9d643fb46f5318>
- <https://git.kernel.org/stable/c/2db9bfa3e27bdea15e05ea70b56bad3d21e570ec>

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-2026-89477>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-89477/>. Everything for agents: <https://agentprime.io/llms.txt>.