# ring-buffer: Hold cpu_buffer::lock when resizing a subbuf

CVE record · `CVE-2026-89501`

- **Identifiers:** `CVE-2026-89501`
- **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:** 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: `8e7b58c27b3c567316a51079b375b846f9223bba to before 8a496aaa3da6e8d545896c2370c7e617cc931ae2` (git)
  - affected: `8e7b58c27b3c567316a51079b375b846f9223bba to before 6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2` (git)
  - affected: `8e7b58c27b3c567316a51079b375b846f9223bba to before bf242baf58de03467f226c8e29554c9495dca7fc` (git)
  - affected: `8e7b58c27b3c567316a51079b375b846f9223bba to before 24974bd0da1b47fd56c975533ead50abf754e74d` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.8`
  - unaffected: `before 6.8` (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

- 7.8 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:** 0.0017, the 6th 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-2026-89501](https://www.cve.org/CVERecord?id=CVE-2026-89501)
- [NVD: CVE-2026-89501](https://nvd.nist.gov/vuln/detail/CVE-2026-89501)

### References from the CNA

- <https://git.kernel.org/stable/c/8a496aaa3da6e8d545896c2370c7e617cc931ae2>
- <https://git.kernel.org/stable/c/6fcb0b745a0b80df62eae4a93ce52a2d061f4ac2>
- <https://git.kernel.org/stable/c/bf242baf58de03467f226c8e29554c9495dca7fc>
- <https://git.kernel.org/stable/c/24974bd0da1b47fd56c975533ead50abf754e74d>

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-2026-89501>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89501/>. Everything for agents: <https://agentprime.io/llms.txt>.