# sctp: fix use-after-free of cached ASCONF chunk

CVE record · `CVE-2026-74587`

- **Identifiers:** `CVE-2026-74587`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 22 Aug 2026
- **Updated:** 16 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 22 Aug 2026, 15:31 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.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `a000c01e60e40e15304ffe48fff051d17a7bea91 to before 10459b03e2d9ee12435e96f587de4d4cacdbf435` (git)
  - affected: `a000c01e60e40e15304ffe48fff051d17a7bea91 to before e1bb114e09372fd6e03387ced9ef566da336ed6c` (git)
  - affected: `a000c01e60e40e15304ffe48fff051d17a7bea91 to before 179676f0166230c80053a392303485b37c93dd33` (git)
  - affected: `a000c01e60e40e15304ffe48fff051d17a7bea91 to before dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d` (git)
  - affected: `a000c01e60e40e15304ffe48fff051d17a7bea91 to before 618b5c6d049896fcfabb91afc072954c92cb2693` (git)
  - affected: `a000c01e60e40e15304ffe48fff051d17a7bea91 to before 07daf4f9750104960a1d60831b2353c0d41f35fb` (git)
  - affected: `a000c01e60e40e15304ffe48fff051d17a7bea91 to before d949992bc3f00027a2c755e860a11950c75f6073` (git)
  - affected: `a000c01e60e40e15304ffe48fff051d17a7bea91 to before 8c283e7b56adce00193837f3311b06662466fb21` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.0`
  - unaffected: `before 3.0` (semver)
  - unaffected: `5.10.265 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.216 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.183 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.152 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.104 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.45 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.9 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0050, the 43rd percentile, on 15 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 Aug 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-74587](https://www.cve.org/CVERecord?id=CVE-2026-74587)
- [NVD: CVE-2026-74587](https://nvd.nist.gov/vuln/detail/CVE-2026-74587)

### References from the CNA

- <https://git.kernel.org/stable/c/10459b03e2d9ee12435e96f587de4d4cacdbf435>
- <https://git.kernel.org/stable/c/e1bb114e09372fd6e03387ced9ef566da336ed6c>
- <https://git.kernel.org/stable/c/179676f0166230c80053a392303485b37c93dd33>
- <https://git.kernel.org/stable/c/dc67d528c2fa939cec7fe3bf7f3089c8d281ca3d>
- <https://git.kernel.org/stable/c/618b5c6d049896fcfabb91afc072954c92cb2693>
- <https://git.kernel.org/stable/c/07daf4f9750104960a1d60831b2353c0d41f35fb>
- <https://git.kernel.org/stable/c/d949992bc3f00027a2c755e860a11950c75f6073>
- <https://git.kernel.org/stable/c/8c283e7b56adce00193837f3311b06662466fb21>

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-2026-74587>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-74587/>. Everything for agents: <https://agentprime.io/llms.txt>.