# timers/itimer: Zero-init old itimerval before copy to userspace

CVE record · `CVE-2026-89765`

- **Identifiers:** `CVE-2026-89765`
- **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, 19:47 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: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 6d4b937251386d9c6f968e7802f0cb16a8523772` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4ea70146ab9376092297eb8b622ef1792797f2cf` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before a17b345daff46fec4af9f1ecbdf350208016dd15` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before bdfda99c5763822a9a888e8af0ad7d9312ffcfe2` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 00ef529a5402f41eb1d227916437e237450719f9` (git)
  - affected: `1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.12`
  - unaffected: `before 2.6.12` (semver)
  - unaffected: `5.10.270 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.221 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (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:** 0.0020, 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-2026-89765](https://www.cve.org/CVERecord?id=CVE-2026-89765)
- [NVD: CVE-2026-89765](https://nvd.nist.gov/vuln/detail/CVE-2026-89765)

### References from the CNA

- <https://git.kernel.org/stable/c/6d4b937251386d9c6f968e7802f0cb16a8523772>
- <https://git.kernel.org/stable/c/4ea70146ab9376092297eb8b622ef1792797f2cf>
- <https://git.kernel.org/stable/c/a17b345daff46fec4af9f1ecbdf350208016dd15>
- <https://git.kernel.org/stable/c/bdfda99c5763822a9a888e8af0ad7d9312ffcfe2>
- <https://git.kernel.org/stable/c/4c66719dd1e4023c5e3f7d050f1bbefec3dfbeb4>
- <https://git.kernel.org/stable/c/2bf5e8f7c9bf4ad3be343a9a6e3e50a34264d25e>
- <https://git.kernel.org/stable/c/00ef529a5402f41eb1d227916437e237450719f9>
- <https://git.kernel.org/stable/c/18c7d85864e554adc8fad1e8d2e9d2cb6c3911c8>

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-2026-89765>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89765/>. Everything for agents: <https://agentprime.io/llms.txt>.