# dm-thin: fix metadata refcount underflow

CVE record · `CVE-2026-46107`

- **Identifiers:** `CVE-2026-46107`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Weakness (CWE):** [CWE-667](https://cwe.mitre.org/data/definitions/667.html)
- **Tags:** [CWE-667](https://agentprime.io/advisories/tag/cwe-667.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 28 May 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 28 May 2026, 09:35 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: `3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to before b719d12cb94df345e9ad2715fd0abe9afcaeb111` (git)
  - affected: `3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to before f49b41c9eb7c6ff00df27cd49cea210abbadd8ad` (git)
  - affected: `3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to before f06f6aededd792a754cd677c02b3d3016d868c2c` (git)
  - affected: `3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to before 12161e03d33afce781f68fa11cc6060538862fad` (git)
  - affected: `3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to before 323d252a4a378834e4fe68298ca61cfc5dd3a460` (git)
  - affected: `3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to before 85311a585a26640760cd0f3349ab9f2905691044` (git)
  - affected: `3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to before 5ec0debbcfd43596e32c1239e993de06a704e04c` (git)
  - affected: `3241b1d3e0aaafbfcd320f4d71ade629728cc4f4 to before 09a65adc7d8bbfce06392cb6d375468e2728ead5` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.2`
  - unaffected: `before 3.2` (semver)
  - unaffected: `5.10.259 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.209 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.175 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.140 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.88 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.30 to 6.18.*, inclusive` (semver)
  - unaffected: `7.0.7 to 7.0.*, inclusive` (semver)
  - unaffected: `7.1 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0010, the 1st percentile, on 5 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 28 May 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-46107](https://www.cve.org/CVERecord?id=CVE-2026-46107)
- [NVD: CVE-2026-46107](https://nvd.nist.gov/vuln/detail/CVE-2026-46107)

### References from the CNA

- <https://git.kernel.org/stable/c/b719d12cb94df345e9ad2715fd0abe9afcaeb111>
- <https://git.kernel.org/stable/c/f49b41c9eb7c6ff00df27cd49cea210abbadd8ad>
- <https://git.kernel.org/stable/c/f06f6aededd792a754cd677c02b3d3016d868c2c>
- <https://git.kernel.org/stable/c/12161e03d33afce781f68fa11cc6060538862fad>
- <https://git.kernel.org/stable/c/323d252a4a378834e4fe68298ca61cfc5dd3a460>
- <https://git.kernel.org/stable/c/85311a585a26640760cd0f3349ab9f2905691044>
- <https://git.kernel.org/stable/c/5ec0debbcfd43596e32c1239e993de06a704e04c>
- <https://git.kernel.org/stable/c/09a65adc7d8bbfce06392cb6d375468e2728ead5>

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-2026-46107>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-46107/>. Everything for agents: <https://agentprime.io/llms.txt>.