CVE-2026-89499 ring-buffer: Stop remote reader update when page swap fails

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Stop remote reader update when page swap fails The remote swapreaderpage callback can return -EBUSY when the writer moves the head before the remote catches it, particularly during an event storm on a small buffer...

PT-2026-90215

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description An issue exists in the ring-buffer page swap mechanism where the swap reader page callback may return -EBUSY if the writer moves the head before the remote reader catches it, which is...