CVE-2026-89499High· 7.8▾ TwilightIn 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 cat…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 5.5
none → medium
— → 7.8
none → high
7.8 → 5.5
high → medium
5.5 → 7.8
medium → high
7.8 → 5.5
high → medium
0.2% → 0.2%
Last analysed / modified upstream
5.5 → 7.8
medium → high
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.
Linux >= 2e67fabd8b77c4f482df9b211bca1b495c6c2c24 < a14a97048e48471e283d76879b83d2ae323e0722Linux >= 2e67fabd8b77c4f482df9b211bca1b495c6c2c24 < 5eab74874d11160725c42ab676ba97a797a362ebLinux 7.1Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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