CVE-2026-31499 Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()

What is CVE-2026-31499?

CVE-2026-31499 is a medium-severity vulnerability in Linux kernel, published on 22 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: L2CAP: Fix deadlock in l2cap_conn_del()

l2cap_conn_del() calls cancel_delayed_work_sync() for both info_timer and id_addr_timer while holding conn->lock. However, the work functions l2cap_info_timeout() and l2cap_conn_update_id_addr() both acquire conn->lock, creating a potential AB-BA deadlock if the work is already executing when l2cap_conn_del() takes the lock.

Move the work cancellations before acquiring conn->lock and use disable_delayed_work_sync() to additionally prevent the works from being rearmed after cancellation, consistent with the pattern used in hci_conn_del().

Weakness: CWE-667

Which versions are affected by CVE-2026-31499?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-31499?

Apply the vendor's patch.

Is CVE-2026-31499 being exploited?

There is no known exploitation of CVE-2026-31499 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-85008, BELL-CVE-2026-31499, DEBIAN-CVE-2026-31499, GHSA-hr22-g233-2gjg, ROOT-OS-DEBIAN-13-CVE-2026-31499, ROOT-OS-UBUNTU-2404-CVE-2026-31499 and 1 more.