CVE-2026-89499
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Linux kernel ring-buffer subsystem, __rb_get_reader_page_from_remote() continues despite a failed swap_reader_page callback (returning -EBUSY), potentially mishandling the page list. The fix treats the callback failure as recoverable, logs it with pr_warn_ratelimited(), and returns NULL.
Risk Assessment
Incorrect handling of reader pages can lead to data corruption or kernel crashes, especially during event storms on a small buffer.
Recommendation
Update the Linux kernel to a version with the fix that handles swap_reader_page callback failure as a recoverable error and returns NULL.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Stop remote reader update when page swap fails The remote swap_reader_page callback can return -EBUSY when the writer moves the head before the remote catches it, particularly during an event storm on a small buffer. __rb_get_reader_page_from_remote() currently warns about that failure but continues with the unchanged reader ID and rearranges the local page list as though the swap succeeded. Handle the callback failure as a recoverable error. Report it with pr_warn_ratelimited() and return NULL. Callers already handle a NULL reader page as a failed attempt. This avoids splicing the same page as both the previous and new reader without flooding the log under contention.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS