# ceph: do not repeat ceph_trim_dentries() if no progress possible

CVE record · `CVE-2026-89647`

- **Identifiers:** `CVE-2026-89647`
- **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:** 30 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: `37c4efc1ddf98ba8b234d116d863a9464445901e to before f2f6daf8e99e15d636b1706bb4efd9a856195324` (git)
  - affected: `37c4efc1ddf98ba8b234d116d863a9464445901e to before dd2e9824e5e7dba406005ff779a107f773175a76` (git)
  - affected: `37c4efc1ddf98ba8b234d116d863a9464445901e to before 5a541eb401acb89d791da41189d7a79220164b93` (git)
  - affected: `37c4efc1ddf98ba8b234d116d863a9464445901e to before 37d6edb2f03b29399a3a337fae78674de51e1695` (git)
  - affected: `37c4efc1ddf98ba8b234d116d863a9464445901e to before 3d122b2feb1dd76bb5041bdea5e1e1b007d8d415` (git)
  - affected: `37c4efc1ddf98ba8b234d116d863a9464445901e to before e7d7aa7b730178278109c41fa1b17b06873065d5` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.1`
  - unaffected: `before 5.1` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 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

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The Linux kernel's ceph filesystem client is affected from version 5.1 until fixed in 6.1.191, 6.6.160, 6.12.109, 6.18.50, or later stable releases. A busy loop in cap reclaim can consume CPU without making progress. The source gives no details on attacker requirements. Upgrade to a fixed kernel version.

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

- 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:** 0.0067, the 52nd 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-2026-89647](https://www.cve.org/CVERecord?id=CVE-2026-89647)
- [NVD: CVE-2026-89647](https://nvd.nist.gov/vuln/detail/CVE-2026-89647)

### References from the CNA

- <https://git.kernel.org/stable/c/f2f6daf8e99e15d636b1706bb4efd9a856195324>
- <https://git.kernel.org/stable/c/dd2e9824e5e7dba406005ff779a107f773175a76>
- <https://git.kernel.org/stable/c/5a541eb401acb89d791da41189d7a79220164b93>
- <https://git.kernel.org/stable/c/37d6edb2f03b29399a3a337fae78674de51e1695>
- <https://git.kernel.org/stable/c/3d122b2feb1dd76bb5041bdea5e1e1b007d8d415>
- <https://git.kernel.org/stable/c/e7d7aa7b730178278109c41fa1b17b06873065d5>

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-2026-89647>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89647/>. Everything for agents: <https://agentprime.io/llms.txt>.