# sunrpc: defer rq_argp and rq_resp free until after RCU grace period

CVE record · `CVE-2026-89545`

- **Identifiers:** `CVE-2026-89545`
- **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, 19:44 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: `812443865c5fc255363d4a684a62c086af1addca to before c977158237bccc3d2512d5b17c47ee3760dc8839` (git)
  - affected: `812443865c5fc255363d4a684a62c086af1addca to before 0ea49d69aa806008b2424c8cf21cf746b9963967` (git)
  - affected: `812443865c5fc255363d4a684a62c086af1addca to before 08bc49e0541260bf294962cf889a32a2d2713ad6` (git)
  - affected: `812443865c5fc255363d4a684a62c086af1addca to before e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090` (git)
  - affected: `812443865c5fc255363d4a684a62c086af1addca to before c479bde671cbe2f9e152834a8b0eb7c3c295bbaf` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.19`
  - unaffected: `before 3.19` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.12.111 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.

> The Linux kernel sunrpc subsystem is affected from version 3.19, where a use-after-free can occur when RCU readers access server thread data that was freed too early during thread exit. The source does not state what access an attacker needs to trigger it, though it is rated CVSS 3.1 7.8 (HIGH). Upgrade to 6.1.191, 6.12.111, 6.18.50, or 7.2.4 or later in the matching stable 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

- 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-2026-89545](https://www.cve.org/CVERecord?id=CVE-2026-89545)
- [NVD: CVE-2026-89545](https://nvd.nist.gov/vuln/detail/CVE-2026-89545)

### References from the CNA

- <https://git.kernel.org/stable/c/c977158237bccc3d2512d5b17c47ee3760dc8839>
- <https://git.kernel.org/stable/c/0ea49d69aa806008b2424c8cf21cf746b9963967>
- <https://git.kernel.org/stable/c/08bc49e0541260bf294962cf889a32a2d2713ad6>
- <https://git.kernel.org/stable/c/e0c5693d3f9a5d4911735ab0e0eba4eecb1f1090>
- <https://git.kernel.org/stable/c/c479bde671cbe2f9e152834a8b0eb7c3c295bbaf>

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-2026-89545>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-89545/>. Everything for agents: <https://agentprime.io/llms.txt>.