CVE-2026-64406

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.

References

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