# ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page

CVE record · `CVE-2026-89500`

- **Identifiers:** `CVE-2026-89500`
- **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 d8f52dc3c3f1f987d8cf920ccd8d66590870bf3f` (git)
  - affected: `8e7b58c27b3c567316a51079b375b846f9223bba to before a1dabe68fb53730bc0be60c5dbfd3f4c560084e7` (git)
  - affected: `8e7b58c27b3c567316a51079b375b846f9223bba to before d787d509bdf6c88c85e095247daf7456cb7fb772` (git)
  - affected: `8e7b58c27b3c567316a51079b375b846f9223bba to before 7a1fb95de5404134f8758c1295ce88986bdf117c` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.8`
  - unaffected: `before 6.8` (semver)
  - unaffected: `6.12.112 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 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-2026-89500](https://www.cve.org/CVERecord?id=CVE-2026-89500)
- [NVD: CVE-2026-89500](https://nvd.nist.gov/vuln/detail/CVE-2026-89500)

### References from the CNA

- <https://git.kernel.org/stable/c/d8f52dc3c3f1f987d8cf920ccd8d66590870bf3f>
- <https://git.kernel.org/stable/c/a1dabe68fb53730bc0be60c5dbfd3f4c560084e7>
- <https://git.kernel.org/stable/c/d787d509bdf6c88c85e095247daf7456cb7fb772>
- <https://git.kernel.org/stable/c/7a1fb95de5404134f8758c1295ce88986bdf117c>

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-2026-89500>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89500/>. Everything for agents: <https://agentprime.io/llms.txt>.