# net: shaper: protect late read accesses to the hierarchy

CVE record · `CVE-2026-23437`

- **Identifiers:** `CVE-2026-23437`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Weakness (CWE):** [CWE-662](https://cwe.mitre.org/data/definitions/662.html)
- **Tags:** [CWE-662](https://agentprime.io/advisories/tag/cwe-662.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 3 Apr 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 3 Apr 2026, 15:15 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: `4b623f9f0f59652ea71fcb27d60b4c3b65126dbb to before 581eee0890a8bde44f1fb78ad3e70502a897d583` (git)
  - affected: `4b623f9f0f59652ea71fcb27d60b4c3b65126dbb to before 348758ba74e6a348299965b16a97cfb817545cc0` (git)
  - affected: `4b623f9f0f59652ea71fcb27d60b4c3b65126dbb to before 0f9ea7141f365b4f27226898e62220fb98ef8dc6` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.13`
  - unaffected: `before 6.13` (semver)
  - unaffected: `6.18.20 to 6.18.*, inclusive` (semver)
  - unaffected: `6.19.10 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:** 0.0013, the 2nd percentile, on 6 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 3 Apr 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-23437](https://www.cve.org/CVERecord?id=CVE-2026-23437)
- [NVD: CVE-2026-23437](https://nvd.nist.gov/vuln/detail/CVE-2026-23437)

### References from the CNA

- <https://git.kernel.org/stable/c/581eee0890a8bde44f1fb78ad3e70502a897d583>
- <https://git.kernel.org/stable/c/348758ba74e6a348299965b16a97cfb817545cc0>
- <https://git.kernel.org/stable/c/0f9ea7141f365b4f27226898e62220fb98ef8dc6>

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-2026-23437>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-23437/>. Everything for agents: <https://agentprime.io/llms.txt>.