# dm cache: fix issue with background work locking

CVE record · `CVE-2026-99256`

- **Identifiers:** `CVE-2026-99256`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 3 Nov 2026
- **Updated:** 3 Nov 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 3 Nov 2026, 11:25 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: `b29d4986d0da1a27cd35917cdb433672f5c95d7f to before 0c7a8cad7c96012a9157a189649e569d0390f384` (git)
  - affected: `b29d4986d0da1a27cd35917cdb433672f5c95d7f to before f5db935d257023c3ef410bd39163b949b0e5a55d` (git)
  - affected: `b29d4986d0da1a27cd35917cdb433672f5c95d7f to before 6290507ecc0dd6dd40759729cbbbd49b1d2a63c4` (git)
  - affected: `b29d4986d0da1a27cd35917cdb433672f5c95d7f to before 8433fd005c25fd127021f67c9144a879fb585572` (git)
  - affected: `b29d4986d0da1a27cd35917cdb433672f5c95d7f to before 2f2cfa16dd0f4179bb988139dd37d00a42324f6c` (git)
  - affected: `b29d4986d0da1a27cd35917cdb433672f5c95d7f to before 73df2ff409f3db95029982fe3656329568e3715d` (git)
  - affected: `b29d4986d0da1a27cd35917cdb433672f5c95d7f to before 104f09e02038b0fc6bbb718b3976af029e15c1d0` (git)
  - affected: `b29d4986d0da1a27cd35917cdb433672f5c95d7f to before bc9781c0247de107876f32929f1637db93a42b34` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.12`
  - unaffected: `before 4.12` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.161 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.115 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.59 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.13 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 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 3 Nov 2026, 11:25 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-99256)
- 3 Nov 2026, 11:27 UTC: First seen by agentprime
- 3 Nov 2026, 12:17 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-99256)

## Sources

- [CVE List: CVE-2026-99256](https://www.cve.org/CVERecord?id=CVE-2026-99256)
- [NVD: CVE-2026-99256](https://nvd.nist.gov/vuln/detail/CVE-2026-99256)

### References from the CNA

- <https://git.kernel.org/stable/c/0c7a8cad7c96012a9157a189649e569d0390f384>
- <https://git.kernel.org/stable/c/f5db935d257023c3ef410bd39163b949b0e5a55d>
- <https://git.kernel.org/stable/c/6290507ecc0dd6dd40759729cbbbd49b1d2a63c4>
- <https://git.kernel.org/stable/c/8433fd005c25fd127021f67c9144a879fb585572>
- <https://git.kernel.org/stable/c/2f2cfa16dd0f4179bb988139dd37d00a42324f6c>
- <https://git.kernel.org/stable/c/73df2ff409f3db95029982fe3656329568e3715d>
- <https://git.kernel.org/stable/c/104f09e02038b0fc6bbb718b3976af029e15c1d0>
- <https://git.kernel.org/stable/c/bc9781c0247de107876f32929f1637db93a42b34>

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-2026-99256>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99256/>. Everything for agents: <https://agentprime.io/llms.txt>.