Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 2e67fabd8b77c4f482df9b211bca1b495c6c2c24 before a14a97048e48471e283d76879b83d2ae323e0722; affected 2e67fabd8b77c4f482df9b211bca1b495c6c2c24 before 5eab74874d11160725c42ab676ba97a797a362eb |
| Linux / Linux | affected 7.1; unaffected 0 before 7.1; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.