CVE-2026-64406

Bluetooth: fix UAF in bt_accept_dequeue()

State: Published
Severity: 8.0 High
Published: Jul 25, 2026
Updated: Oct 19, 2026
Reserved: Jul 19, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.0 High	CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
LinuxLinux	751de6ec671fe75ad9cf65a0638d2a06b6a5984d to before c0577c55219be42b6ea2ea8db11e85bfab6f4e8dAffected 407217734835d21d4e0105ebf347860dc1806f88 to before 96ad400d5132eb333f28f6f1e2d58f0728ca9547Affected 7eebd4c2c86f573af87ff165d08a83432eb0b919 to before 0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0Affected 5d86d2f1b4d9a508c441d3e45277ae1a73cfed57 to before c66a95e60b65d876a927123b0ed36bd6177d9ca6Affected 87c543e2f78d0871f271df92dab98901bbd5b6f5 to before 6303ed4bbe0095f4cc195225479bf506e010d1dbAffected added1213395071470a900cc845a042fb51882a6 to before 26168db1ce5a9766cde021b18e590a101c056614Affected ab1513597c6cf17cd1ad2a21e3b045421b48e022 to before 50c662bdcd51b03033a0abed6716bfd377ba1049Affected ab1513597c6cf17cd1ad2a21e3b045421b48e022 to before 4bd0b274054f2679f28b70222b607bb0afc3ab9aAffected a5ca86a6097a8b030ca3226cd300b17ed330f966Affected 5.10.259 to before 5.10.261Affected 5.15.210 to before 5.15.212Affected 6.1.175 to before 6.1.178Affected 6.6.142 to before 6.6.145Affected 6.12.92 to before 6.12.96Affected 6.18.34 to before 6.18.39Affected 7.0.11 to before 7.1Affected
LinuxLinux	7.1Affected before 7.1Not affected 5.10.261 through 5.10.Not affected 5.15.212 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.96 through 6.12.Not affected 6.18.39 through 6.18.Not affected 7.1.4 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

751de6ec671fe75ad9cf65a0638d2a06b6a5984d to before c0577c55219be42b6ea2ea8db11e85bfab6f4e8dAffected
407217734835d21d4e0105ebf347860dc1806f88 to before 96ad400d5132eb333f28f6f1e2d58f0728ca9547Affected
7eebd4c2c86f573af87ff165d08a83432eb0b919 to before 0a98ff4e7b867f72fbb4e1237d81e9fa02ded0a0Affected
5d86d2f1b4d9a508c441d3e45277ae1a73cfed57 to before c66a95e60b65d876a927123b0ed36bd6177d9ca6Affected
87c543e2f78d0871f271df92dab98901bbd5b6f5 to before 6303ed4bbe0095f4cc195225479bf506e010d1dbAffected
added1213395071470a900cc845a042fb51882a6 to before 26168db1ce5a9766cde021b18e590a101c056614Affected
ab1513597c6cf17cd1ad2a21e3b045421b48e022 to before 50c662bdcd51b03033a0abed6716bfd377ba1049Affected
ab1513597c6cf17cd1ad2a21e3b045421b48e022 to before 4bd0b274054f2679f28b70222b607bb0afc3ab9aAffected
a5ca86a6097a8b030ca3226cd300b17ed330f966Affected
5.10.259 to before 5.10.261Affected
5.15.210 to before 5.15.212Affected
6.1.175 to before 6.1.178Affected
6.6.142 to before 6.6.145Affected
6.12.92 to before 6.12.96Affected
6.18.34 to before 6.18.39Affected
7.0.11 to before 7.1Affected

LinuxLinux

7.1Affected
before 7.1Not affected
5.10.261 through 5.10.*Not affected
5.15.212 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.96 through 6.12.*Not affected
6.18.39 through 6.18.*Not affected
7.1.4 through 7.1.*Not affected
7.2 and laterNot affected

References

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