Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-89748
Published: September 12, 2026
Vulnerability identifier: #VU149059
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89748
CWE-ID: CWE-670
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to corrupt ring buffer data.
The vulnerability exists due to incorrect retry exhaustion handling in simple_ring_buffer_swap_reader_page() when retrying link replacement during a simple ring buffer reader page swap. A local user can trigger the affected reader page swap operation to corrupt ring buffer data.
Affected software
Linux kernel
How to mitigate CVE-2026-89748
Install security update from vendor's repository.