# jbd2: bound shrinker scans by examined checkpoint buffers

CVE record · `CVE-2026-89567`

- **Identifiers:** `CVE-2026-89567`
- **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:** 21 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:44 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: `b98dba273a0e47dbfade89c9af73c5b012a4eabb to before 6b5366ba63a58819396045ab146bd37ff9e503c6` (git)
  - affected: `b98dba273a0e47dbfade89c9af73c5b012a4eabb to before edf5fcd0469b7467bd5b37a79502c8d9c3257dbb` (git)
  - affected: `b98dba273a0e47dbfade89c9af73c5b012a4eabb to before 71c6b872c746465fa4b5def239cb296173ca8216` (git)
  - affected: `b98dba273a0e47dbfade89c9af73c5b012a4eabb to before c2c0fb364685b8996c357d3b050394959b29d6e0` (git)
  - affected: `b98dba273a0e47dbfade89c9af73c5b012a4eabb to before 15cb16496446b94e67f7abcb049b8e2c75cd3d02` (git)
  - affected: `9c31bb2684f8035beca0275349d19d679b679ffb` (git)
  - affected: `5fda50e262e65bd553ff777c4b280afd1495a18b` (git)
  - affected: `557fda9ed70ebf8eda2620ba3d746215285a1303` (git)
  - affected: `5.15.129 to before 5.16` (semver)
  - affected: `6.1.50 to before 6.2` (semver)
  - affected: `6.4.13 to before 6.5` (semver)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.5`
  - unaffected: `before 6.5` (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

## 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:** 0.0021, 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-2026-89567](https://www.cve.org/CVERecord?id=CVE-2026-89567)
- [NVD: CVE-2026-89567](https://nvd.nist.gov/vuln/detail/CVE-2026-89567)

### References from the CNA

- <https://git.kernel.org/stable/c/6b5366ba63a58819396045ab146bd37ff9e503c6>
- <https://git.kernel.org/stable/c/edf5fcd0469b7467bd5b37a79502c8d9c3257dbb>
- <https://git.kernel.org/stable/c/71c6b872c746465fa4b5def239cb296173ca8216>
- <https://git.kernel.org/stable/c/c2c0fb364685b8996c357d3b050394959b29d6e0>
- <https://git.kernel.org/stable/c/15cb16496446b94e67f7abcb049b8e2c75cd3d02>

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-2026-89567>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89567/>. Everything for agents: <https://agentprime.io/llms.txt>.