# ceph: cap delegated inode count in ceph_parse_deleg_inos()

CVE record · `CVE-2026-89648`

- **Identifiers:** `CVE-2026-89648`
- **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: `d4846487870897a5a149a3220c95bfd5728f9247 to before 4606d76748affb378f9d15a5d77c128793f4b996` (git)
  - affected: `d4846487870897a5a149a3220c95bfd5728f9247 to before 8194d8e61ef0b49baddf660c7e88fc1c563a5e55` (git)
  - affected: `d4846487870897a5a149a3220c95bfd5728f9247 to before 7fc55e8e6b6b50f217b1728415578704baf4d0a2` (git)
  - affected: `d4846487870897a5a149a3220c95bfd5728f9247 to before c040e139f1a629b767f900bbbc3f9892c290ed85` (git)
  - affected: `d4846487870897a5a149a3220c95bfd5728f9247 to before f341270ac5f5077804d7837ce77b0f0df1cea29d` (git)
  - affected: `d4846487870897a5a149a3220c95bfd5728f9247 to before 4bd3158bd62466d57ed72a3f7bc5f205fedd6919` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.7`
  - unaffected: `before 5.7` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 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.

> Linux kernel Ceph client code from version 5.7 onward is affected until fixed. A malicious or compromised Ceph metadata server can send crafted replies that make clients consume unbounded CPU and memory. Upgrade to 6.1.191, 6.6.160, 6.12.114, 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

- 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-2026-89648](https://www.cve.org/CVERecord?id=CVE-2026-89648)
- [NVD: CVE-2026-89648](https://nvd.nist.gov/vuln/detail/CVE-2026-89648)

### References from the CNA

- <https://git.kernel.org/stable/c/4606d76748affb378f9d15a5d77c128793f4b996>
- <https://git.kernel.org/stable/c/8194d8e61ef0b49baddf660c7e88fc1c563a5e55>
- <https://git.kernel.org/stable/c/7fc55e8e6b6b50f217b1728415578704baf4d0a2>
- <https://git.kernel.org/stable/c/c040e139f1a629b767f900bbbc3f9892c290ed85>
- <https://git.kernel.org/stable/c/f341270ac5f5077804d7837ce77b0f0df1cea29d>
- <https://git.kernel.org/stable/c/4bd3158bd62466d57ed72a3f7bc5f205fedd6919>

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-2026-89648>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89648/>. Everything for agents: <https://agentprime.io/llms.txt>.