Deadlock in Linux kernel - CVE-2026-74463
Published: August 16, 2026
Vulnerability identifier: #VU143327
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74463
CWE-ID: CWE-833
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a deadlock in the jz4780 i2c bus driver when handling concurrent i2c transfers involving clock framework operations. A local user can trigger concurrent bus activity to cause a denial of service.
The issue can freeze the system because of a circular dependency between the common clock framework prepare_lock mutex and the i2c adapter lock.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74463
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.105-1
linux (Debian package) - update to 6.12.105-1
External References
- https://git.kernel.org/stable/c/14429dc1c756c35e106f01ff09cadccb82f5531d
- https://git.kernel.org/stable/c/19b783335d62e7a2367436a6e1f1b37da1878360
- https://git.kernel.org/stable/c/aa1944b52d6492c48bdd17046578aa0d953546e6
- https://git.kernel.org/stable/c/b6cb47e186abba85a3b08aa3023067ab82577286
- https://git.kernel.org/stable/c/d99607c888f26e8a4e9fe9772860cef4aff86bb4