# ring-buffer: Free cpu_buffer::free_page with subbuf_order

CVE record · `CVE-2026-89502`

- **Identifiers:** `CVE-2026-89502`
- **State:** Confirmed
- **Severity:** No CVSS score
- **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: `f9b94daa542a8d2532f0930f01cd9aec2d19621b to before 77275ccea06eaf297e8e6ac3fc830cb72086379a` (git)
  - affected: `f9b94daa542a8d2532f0930f01cd9aec2d19621b to before 8c1ecdcdea738efe0494af908f12c0ae3a97fffa` (git)
  - affected: `f9b94daa542a8d2532f0930f01cd9aec2d19621b to before 81063bbb16c4fcf0136c9117d5e49d3621dd6a1e` (git)
  - affected: `f9b94daa542a8d2532f0930f01cd9aec2d19621b to before 234b1a72e9706fe20c08c96f4374ec8e83b934cb` (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

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0021, the 10th 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-2026-89502](https://www.cve.org/CVERecord?id=CVE-2026-89502)
- [NVD: CVE-2026-89502](https://nvd.nist.gov/vuln/detail/CVE-2026-89502)

### References from the CNA

- <https://git.kernel.org/stable/c/77275ccea06eaf297e8e6ac3fc830cb72086379a>
- <https://git.kernel.org/stable/c/8c1ecdcdea738efe0494af908f12c0ae3a97fffa>
- <https://git.kernel.org/stable/c/81063bbb16c4fcf0136c9117d5e49d3621dd6a1e>
- <https://git.kernel.org/stable/c/234b1a72e9706fe20c08c96f4374ec8e83b934cb>

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-2026-89502>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89502/>. Everything for agents: <https://agentprime.io/llms.txt>.