Race condition in Linux kernel - CVE-2026-89503
Published: September 12, 2026
Vulnerability identifier: #VU149303
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89503
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a mismatch between reader-page metadata and allocated memory.
The vulnerability exists due to a race condition in ring_buffer_alloc_read_page() when resizing ring-buffer subbuffers while allocating a reader page. A local user can race reader-page allocation with a subbuffer-order change to cause a mismatch between reader-page metadata and allocated memory.
Affected software
Linux kernel
How to mitigate CVE-2026-89503
Install security update from vendor's repository.