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Vulnerability record · CVE-2026-64406 · published 25 July 2026

CVE-2026-64406: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

8.0 CVSS 3.1 High EPSS 0.43% · top 65.7% CWE-416 · Use after free
8.0CVSS 3.1 base score
0.43%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
4 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-64406), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.