Improper Initialization in Linux kernel - CVE-2026-74602
Published: August 24, 2026
Vulnerability identifier: #VU144964
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74602
CWE-ID: CWE-665
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 improper initialization in rb_allocate_cpu_buffer() in the ring buffer subsystem when freeing ring-buffer reader pages for sub-buffers larger than PAGE_SIZE. A local user can trigger allocation and freeing of a crafted ring buffer configuration to cause a denial of service.
The issue affects ring buffers with sub-buffers larger than PAGE_SIZE.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74602
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