# bpf: Fix incorrect pruning due to atomic fetch precision tracking

CVE record · `CVE-2026-43009`

- **Identifiers:** `CVE-2026-43009`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Weakness (CWE):** [CWE-682](https://cwe.mitre.org/data/definitions/682.html)
- **Tags:** [CWE-682](https://agentprime.io/advisories/tag/cwe-682.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 1 May 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 1 May 2026, 14:15 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: `5ca419f2864a2c60940dcf4bbaeb69546200e36f to before 06999c8a2c52b13977771ab093b8e179821b532d` (git)
  - affected: `5ca419f2864a2c60940dcf4bbaeb69546200e36f to before 1aac6b271e0a80b91c2f6a8f75ab0c0b1fc8ffe8` (git)
  - affected: `5ca419f2864a2c60940dcf4bbaeb69546200e36f to before 7c72e5f3741d1c5cc53439137162f0e09254e6e9` (git)
  - affected: `5ca419f2864a2c60940dcf4bbaeb69546200e36f to before ea150ffa9fc9f78c5cf22e1f7b06b6d016b1017c` (git)
  - affected: `5ca419f2864a2c60940dcf4bbaeb69546200e36f to before 7ffbe45b1d227e24659998a91cfd4c27af457e71` (git)
  - affected: `5ca419f2864a2c60940dcf4bbaeb69546200e36f to before 179ee84a89114b854ac2dd1d293633a7f6c8dac1` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.12`
  - unaffected: `before 5.12` (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: `6.18.50 to 6.18.*, inclusive` (semver)
  - unaffected: `6.19.12 to 6.19.*, inclusive` (semver)
  - unaffected: `7.0 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:** 0.0016, the 5th 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 1 May 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-43009](https://www.cve.org/CVERecord?id=CVE-2026-43009)
- [NVD: CVE-2026-43009](https://nvd.nist.gov/vuln/detail/CVE-2026-43009)

### References from the CNA

- <https://git.kernel.org/stable/c/06999c8a2c52b13977771ab093b8e179821b532d>
- <https://git.kernel.org/stable/c/1aac6b271e0a80b91c2f6a8f75ab0c0b1fc8ffe8>
- <https://git.kernel.org/stable/c/7c72e5f3741d1c5cc53439137162f0e09254e6e9>
- <https://git.kernel.org/stable/c/ea150ffa9fc9f78c5cf22e1f7b06b6d016b1017c>
- <https://git.kernel.org/stable/c/7ffbe45b1d227e24659998a91cfd4c27af457e71>
- <https://git.kernel.org/stable/c/179ee84a89114b854ac2dd1d293633a7f6c8dac1>

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-2026-43009>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-43009/>. Everything for agents: <https://agentprime.io/llms.txt>.