CVE-2026-31408
Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold
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.
INFO
Published Date :
April 6, 2026, 8:16 a.m.
Last Modified :
May 20, 2026, 4:18 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Hold socket reference using sco_sock_hold() before lock release.
- Add sock_put() on all exit paths.
- Apply the provided patch to the Linux kernel.
- Update the Linux kernel to the patched version.
Public PoC/Exploit Available at Github
CVE-2026-31408 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-31408.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-31408 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-31408
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Linux Kernel Security Patches & Analysis - CVEs 2026 - Includes custom kernel for NVIDIA CUDA support
Shell
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-31408 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-31408 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
May. 20, 2026
Action Type Old Value New Value Added CWE CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.168 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.21 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.11 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.131 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.80 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.12.1 up to (excluding) 5.15.203 Added Reference Type kernel.org: https://git.kernel.org/stable/c/108b81514d8f2535eb16651495cefb2250528db3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/45aaca995e4a7a05b272a58e7ab2fff4f611b8f1 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/598dbba9919c5e36c54fe1709b557d64120cb94b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b0a7da0e3f7442545f071499beb36374714bb9de Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d57384e27d1ebf0047e3f00a6e1181b8be9857a2 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e76e8f0581ef555eacc11dbb095e602fb30a5361 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 18, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/d57384e27d1ebf0047e3f00a6e1181b8be9857a2 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 11, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/b0a7da0e3f7442545f071499beb36374714bb9de -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 06, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/108b81514d8f2535eb16651495cefb2250528db3 Added Reference https://git.kernel.org/stable/c/45aaca995e4a7a05b272a58e7ab2fff4f611b8f1 Added Reference https://git.kernel.org/stable/c/598dbba9919c5e36c54fe1709b557d64120cb94b Added Reference https://git.kernel.org/stable/c/7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e Added Reference https://git.kernel.org/stable/c/e76e8f0581ef555eacc11dbb095e602fb30a5361