# Bluetooth: L2CAP: validate frame length before control and FCS access

CVE record · `CVE-2026-98457`

- **Identifiers:** `CVE-2026-98457`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 18 Oct 2026
- **Updated:** 19 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 18 Oct 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: `1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 4373ba79a267947e771c438507f7b103e30bdb21` (git)
  - affected: `1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 965bd88ed4b4763cb765dd65885adcfa588c6b14` (git)
  - affected: `1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70` (git)
  - affected: `1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 8c7556c7cd17e073bbefdc4a9a4694a207544c37` (git)
  - affected: `1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 1fdbb2a712a9a162ee817c959740face80b3d929` (git)
  - affected: `1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before c6a288e6001bcce16553c3853e0f5a45eaaf85c7` (git)
  - affected: `1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before f557274af7b94b6134692e6f26b880f1e34c15bf` (git)
  - affected: `1c2acffb76d4bc5fd27c4ea55cc27ad8ead10f9a to before 6c78a213d9070b610c7f418af2c25b66180b7e37` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.32`
  - unaffected: `before 2.6.32` (semver)
  - unaffected: `5.10.271 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.222 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.189 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.158 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.112 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.55 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.9 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:** 0.0018, the 8th percentile, on 9 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 18 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-98457](https://www.cve.org/CVERecord?id=CVE-2026-98457)
- [NVD: CVE-2026-98457](https://nvd.nist.gov/vuln/detail/CVE-2026-98457)

### References from the CNA

- <https://git.kernel.org/stable/c/4373ba79a267947e771c438507f7b103e30bdb21>
- <https://git.kernel.org/stable/c/965bd88ed4b4763cb765dd65885adcfa588c6b14>
- <https://git.kernel.org/stable/c/3acf6a0038ec0d4e8f4dcbfc2a557dff5f61cb70>
- <https://git.kernel.org/stable/c/8c7556c7cd17e073bbefdc4a9a4694a207544c37>
- <https://git.kernel.org/stable/c/1fdbb2a712a9a162ee817c959740face80b3d929>
- <https://git.kernel.org/stable/c/c6a288e6001bcce16553c3853e0f5a45eaaf85c7>
- <https://git.kernel.org/stable/c/f557274af7b94b6134692e6f26b880f1e34c15bf>
- <https://git.kernel.org/stable/c/6c78a213d9070b610c7f418af2c25b66180b7e37>

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-2026-98457>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98457/>. Everything for agents: <https://agentprime.io/llms.txt>.