What’s Vulnerable › Vulnerabilities

CVE-2025-40318: Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-08 · updated 2026-10-15

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once hci_cmd_sync_dequeue_once() does lookup and then cancel the entry under two separate lock sections. Meanwhile, hci_cmd_sync_work() can also delete the same entry, leading to double list_del() and "UAF". Fix this by holding cmd_sync_work_lock across both lookup and cancel, so that the entry cannot be removed concurrently.

Affected products

• Linux kernel: from 6.1.120 before 6.1.159; from 6.6.51 before 6.6.117; from 6.8.9 before 6.9; 6.9 — fixed in 6.1.159, 6.18, 6.6.117, 6.9

How to fix

Upgrade to a fixed version: Linux kernel 6.1.159, 6.18, 6.6.117, 6.9. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/09b0cd1297b4dbfe736aeaa0ceeab2265f47f772
• https://git.kernel.org/stable/c/0a94f7e017438935c09ef833a1aa908ad9875213
• https://git.kernel.org/stable/c/932c0a4f77ac13e526fdd5b42914d29c9821d389
• https://git.kernel.org/stable/c/9cd536970192b72257afcdfba0bfc09993e6f19c
• https://git.kernel.org/stable/c/ae76cf6c2c842944c6514c57df54d728f1916553

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