# Bluetooth: hci_sync: don't drain cmd_sync backlog on unregister

CVE record · `CVE-2026-98809`

- **Identifiers:** `CVE-2026-98809`
- **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:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 18 Oct 2026, 15:48 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: `008ee9eb8a11bcabf12c91771dd4f470b082bd44 to before b06d85b114cc5fa61809f9950bca66502e0e1173` (git)
  - affected: `008ee9eb8a11bcabf12c91771dd4f470b082bd44 to before b11acfcb5925ed27fae692b27931a1ac732677fb` (git)
  - affected: `008ee9eb8a11bcabf12c91771dd4f470b082bd44 to before 143bde97c4101ae68eb656c87e620c45b07a3090` (git)
  - affected: `008ee9eb8a11bcabf12c91771dd4f470b082bd44 to before 7f16443a30f4e86d84ae4faf057d333b41ddb757` (git)
  - affected: `008ee9eb8a11bcabf12c91771dd4f470b082bd44 to before e8ba8c9c74d1035042cdf6cb5adf8f59b9b1271c` (git)
  - affected: `008ee9eb8a11bcabf12c91771dd4f470b082bd44 to before b1f24c1ab52345e810c42a1a81286cb5a7c92252` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.17`
  - unaffected: `before 5.17` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.113 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.56 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.10 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:** 0.0017, the 6th percentile, on 7 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-2026-98809](https://www.cve.org/CVERecord?id=CVE-2026-98809)
- [NVD: CVE-2026-98809](https://nvd.nist.gov/vuln/detail/CVE-2026-98809)

### References from the CNA

- <https://git.kernel.org/stable/c/b06d85b114cc5fa61809f9950bca66502e0e1173>
- <https://git.kernel.org/stable/c/b11acfcb5925ed27fae692b27931a1ac732677fb>
- <https://git.kernel.org/stable/c/143bde97c4101ae68eb656c87e620c45b07a3090>
- <https://git.kernel.org/stable/c/7f16443a30f4e86d84ae4faf057d333b41ddb757>
- <https://git.kernel.org/stable/c/e8ba8c9c74d1035042cdf6cb5adf8f59b9b1271c>
- <https://git.kernel.org/stable/c/b1f24c1ab52345e810c42a1a81286cb5a7c92252>

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-2026-98809>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98809/>. Everything for agents: <https://agentprime.io/llms.txt>.