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Vulnerability record · CVE-2026-31408 · published 6 April 2026

CVE-2026-31408: Linux kernel use after free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold sco_recv_frame() reads conn->sk under sco_conn_lock() but immediately releases the lock without holding a reference to the socket. A concurrent close() can free the socket between the lock release and the subsequent sk->sk_state access, resulting in a use-after-free. Other functions in the same file (sco_sock_timeout(), sco_conn_del()) correctly use sco_sock_hold() to safely hold a reference under the lock. Fix by using sco_sock_hold() to take a reference before releasing the lock, and adding sock_put() on all exit paths.

8.8 CVSS 3.1 High EPSS 0.40% · top 68.3% CWE-416 · Use after free
8.8CVSS 3.1 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
19 Aug 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold sco_recv_frame() reads conn->sk under sco_conn_lock() but immediately releases the lock without holding a reference to the socket. A concurrent close() can free the socket between the lock release and the subsequent sk->sk_state access, resulting in a use-after-free. Other functions in the same file (sco_sock_timeout(), sco_conn_del()) correctly use sco_sock_hold() to safely hold a reference under the lock. Fix by using sco_sock_hold() to take a reference before releasing the lock, and adding sock_put() on all exit paths.

CVSS:3.1/AV:A/AC:L/PR:N/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/108b81514d8f2535eb16651495cefb2250528db3 Patch
https://git.kernel.org/stable/c/37e18bc8c9a70d77bd099e2273f328b3bc7f6d0d
https://git.kernel.org/stable/c/45aaca995e4a7a05b272a58e7ab2fff4f611b8f1 Patch
https://git.kernel.org/stable/c/598dbba9919c5e36c54fe1709b557d64120cb94b Patch
https://git.kernel.org/stable/c/7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e Patch
https://git.kernel.org/stable/c/b0a7da0e3f7442545f071499beb36374714bb9de Patch
https://git.kernel.org/stable/c/d57384e27d1ebf0047e3f00a6e1181b8be9857a2 Patch
https://git.kernel.org/stable/c/e76e8f0581ef555eacc11dbb095e602fb30a5361 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31408), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.