# powerpc/kexec_file: Prevent kexec range truncation

CVE record · `CVE-2026-89962`

- **Identifiers:** `CVE-2026-89962`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:32 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: `180adfc532a83c1d74146449f7385f767d4b8059 to before 1b9f9d566a5826da373dce7fe8958a4f23e86019` (git)
  - affected: `180adfc532a83c1d74146449f7385f767d4b8059 to before ffbdc2a3834a3e47bac7236a71bbc82b45c83832` (git)
  - affected: `180adfc532a83c1d74146449f7385f767d4b8059 to before 9ef63622e6cee588ea4b763a6afc87065254b36a` (git)
  - affected: `180adfc532a83c1d74146449f7385f767d4b8059 to before da88a2a2119e4fd0e8919a7a2448682f574e1545` (git)
  - affected: `180adfc532a83c1d74146449f7385f767d4b8059 to before c4cb547f26d9b73b489c5278d0c8db837c5a174f` (git)
  - affected: `180adfc532a83c1d74146449f7385f767d4b8059 to before fa40f9dbdd4af53e7445d9135b5b207eb8adf372` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.9`
  - unaffected: `before 5.9` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.5 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 powerpc kexec_file code from 5.9 until fixed can truncate memory ranges during merging, so active memory may be left off the kexec exclude lists. The source gives few details on what an attacker needs. Upgrade to 6.1.191, 6.6.160, 6.12.110, 6.18.51, or a later release in those 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0023, the 13th percentile, on 13 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 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89962](https://www.cve.org/CVERecord?id=CVE-2026-89962)
- [NVD: CVE-2026-89962](https://nvd.nist.gov/vuln/detail/CVE-2026-89962)

### References from the CNA

- <https://git.kernel.org/stable/c/1b9f9d566a5826da373dce7fe8958a4f23e86019>
- <https://git.kernel.org/stable/c/ffbdc2a3834a3e47bac7236a71bbc82b45c83832>
- <https://git.kernel.org/stable/c/9ef63622e6cee588ea4b763a6afc87065254b36a>
- <https://git.kernel.org/stable/c/da88a2a2119e4fd0e8919a7a2448682f574e1545>
- <https://git.kernel.org/stable/c/c4cb547f26d9b73b489c5278d0c8db837c5a174f>
- <https://git.kernel.org/stable/c/fa40f9dbdd4af53e7445d9135b5b207eb8adf372>

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-2026-89962>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89962/>. Everything for agents: <https://agentprime.io/llms.txt>.