# Bluetooth: L2CAP: Fix missing key size check for L2CAP_LE_CONN_REQ

CVE record · `CVE-2026-43134`

- **Identifiers:** `CVE-2026-43134`
- **State:** Confirmed
- **Severity:** CVSS 8.1 High
- **Critical:** No
- **CNA:** Linux
- **Weakness (CWE):** [CWE-326](https://cwe.mitre.org/data/definitions/326.html)
- **Tags:** [Weak cryptography or TLS](https://agentprime.io/advisories/tag/weak-crypto.md)
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 6 May 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 6 May 2026, 11:27 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: `27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d to before 335071c0c3637064ec250481f589075db44fe4e6` (git)
  - affected: `27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d to before fa6ad76fa8623c0a50d529cd5726fa5d819a3be4` (git)
  - affected: `27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d to before 9118601ff90b79e8df3c0c98f48ae00c1b02ecef` (git)
  - affected: `27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d to before 481ea39b342c347b6ac029f3d418486280be4e45` (git)
  - affected: `27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d to before ec91078e132179b04e0c3906b599816c056ceaad` (git)
  - affected: `27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d to before 96581749c7c14fbec32c35728520867929600041` (git)
  - affected: `27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d to before 8dd43f9a9323f9c01bc8246da8d81a4c783c9e97` (git)
  - affected: `27e2d4c8d28be1d1b4ecfbffab572d7dbd35254d to before 138d7eca445ef37a0333425d269ee59900ca1104` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.14`
  - unaffected: `before 3.14` (semver)
  - unaffected: `5.10.252 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.202 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.165 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.128 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.75 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.16 to 6.18.*, inclusive` (semver)
  - unaffected: `6.19.6 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0012, the 1st percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 6 May 2026, 12:16 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-43134)

## Sources

- [CVE List: CVE-2026-43134](https://www.cve.org/CVERecord?id=CVE-2026-43134)
- [NVD: CVE-2026-43134](https://nvd.nist.gov/vuln/detail/CVE-2026-43134)

### References from the CNA

- <https://git.kernel.org/stable/c/335071c0c3637064ec250481f589075db44fe4e6>
- <https://git.kernel.org/stable/c/fa6ad76fa8623c0a50d529cd5726fa5d819a3be4>
- <https://git.kernel.org/stable/c/9118601ff90b79e8df3c0c98f48ae00c1b02ecef>
- <https://git.kernel.org/stable/c/481ea39b342c347b6ac029f3d418486280be4e45>
- <https://git.kernel.org/stable/c/ec91078e132179b04e0c3906b599816c056ceaad>
- <https://git.kernel.org/stable/c/96581749c7c14fbec32c35728520867929600041>
- <https://git.kernel.org/stable/c/8dd43f9a9323f9c01bc8246da8d81a4c783c9e97>
- <https://git.kernel.org/stable/c/138d7eca445ef37a0333425d269ee59900ca1104>

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-2026-43134>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-43134/>. Everything for agents: <https://agentprime.io/llms.txt>.