Improper Check for Unusual or Exceptional Conditions in Linux kernel - CVE-2026-89499
Published: September 12, 2026
Vulnerability identifier: #VU149299
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-2026-89499
CWE-ID: CWE-754
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause ring buffer page-list corruption.
The vulnerability exists due to improper handling of callback failures in __rb_get_reader_page_from_remote() when handling remote reader page swaps. A local user can trigger an event storm to cause ring buffer page-list corruption.
The callback can return -EBUSY when the writer moves the head before the remote reader catches it, particularly on a small buffer.
Affected software
Linux kernel
How to mitigate CVE-2026-89499
Install security update from vendor's repository.