Improper resource shutdown or release in Linux kernel - CVE-2026-72333
Published: August 16, 2026
Vulnerability identifier: #VU143106
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-72333
CWE-ID: CWE-404
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper resource management in the Bluetooth L2CAP LE credit handling logic when processing repeated LE CoC traffic. A remote attacker can stream data to the host to exhaust the signaling identifier range and cause a denial of service.
The issue can cause subsequent L2CAP_LE_CREDITS packets to be sent with invalid identifier 0, which some remote stacks ignore, permanently stalling the channel.
Affected software
Linux kernel
Ubuntu
linux-gcp-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
Ubuntu
linux-gcp-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)
How to mitigate CVE-2026-72333
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
linux-gcp-7.0 (Ubuntu package) - addressed in versions 7.0.0-38.38~24.04.4, 7.0.0-1013.13~24.04.1, 7.0.0-1014.14~24.04.1
linux-azure-7.0 (Ubuntu package) - addressed in versions 7.0.0-1016.16~24.04.1, 7.0.0-1017.17~24.04.1
External References
- https://git.kernel.org/stable/c/0c602cb8f148a36bfb39c25ade400bdadc023c4f
- https://git.kernel.org/stable/c/6e1930ece855a4c256f1c7e6632d634cfb9888b5
- https://git.kernel.org/stable/c/b8a32a5fc915b024c60f18d51b6cffd2bd64d4a6
- https://git.kernel.org/stable/c/bd1e01170341291292fd4c46b5f6949da282ca6c
- https://git.kernel.org/stable/c/d0a2b0c81f112540a337cde1c20251bf05ddf1da