Use-after-free in Linux kernel - CVE-2026-74634
Published: August 24, 2026
Vulnerability identifier: #VU144917
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-2026-74634
CWE-ID: CWE-416
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 use-after-free in ring_buffer_subbuf_order_set() and rb_advance_iter() when changing the ring buffer sub-buffer order while resizing is disabled. A local user can trigger a non-consuming reader to access freed buffer pages to cause a denial of service.
The issue affects non-consuming reader scenarios in the ring buffer.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-74634
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