# libceph: validate OSD extent maps before cursor advance

CVE record · `CVE-2026-89657`

- **Identifiers:** `CVE-2026-89657`
- **State:** Confirmed
- **Severity:** CVSS 7.5 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, 19:45 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: `f628d799972799023d32c2542bb2639eb8c4f84e to before 94ae5145c520618802b0a24c047dcd5f05835db8` (git)
  - affected: `f628d799972799023d32c2542bb2639eb8c4f84e to before 058ffa81f9440c5b4714685611cf697fd3739ec9` (git)
  - affected: `f628d799972799023d32c2542bb2639eb8c4f84e to before 2571b35883268a266554e80d368e67fdfea7fb9d` (git)
  - affected: `f628d799972799023d32c2542bb2639eb8c4f84e to before 201db408872ca12cf09e36bf0f560138c3dcfa1c` (git)
  - affected: `f628d799972799023d32c2542bb2639eb8c4f84e to before 9ec08b7499a62c6d4afa93d36ab47a43fcad57d1` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.6`
  - unaffected: `before 6.6` (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

- 7.5 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0061, the 49th 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-2026-89657](https://www.cve.org/CVERecord?id=CVE-2026-89657)
- [NVD: CVE-2026-89657](https://nvd.nist.gov/vuln/detail/CVE-2026-89657)

### References from the CNA

- <https://git.kernel.org/stable/c/94ae5145c520618802b0a24c047dcd5f05835db8>
- <https://git.kernel.org/stable/c/058ffa81f9440c5b4714685611cf697fd3739ec9>
- <https://git.kernel.org/stable/c/2571b35883268a266554e80d368e67fdfea7fb9d>
- <https://git.kernel.org/stable/c/201db408872ca12cf09e36bf0f560138c3dcfa1c>
- <https://git.kernel.org/stable/c/9ec08b7499a62c6d4afa93d36ab47a43fcad57d1>

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-2026-89657>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89657/>. Everything for agents: <https://agentprime.io/llms.txt>.