CVE-2026-89499
CVE CVE-2026-89499EUVD EUVD-2026-76405Published 2026-09-11T19:43:48.000ZLast changed 2026-09-13T06:30:06.000ZCVSS 7.8
What the advisory describes
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.
Source: EUVD (ENISA), in the words of the advisory.
Products the advisory names
These come from the advisory itself, not from any check we performed.
- Linux — Linux patch: 7.3-rc1; patch: 0; patch: 7.2.4; 7.1; 2e67fabd8b77c4f482df9b211bca1b495c6c2c24 <5eab74874d11160725c42ab676ba97a797a362eb; 2e67fabd8b77c4f482df9b211bca1b495c6c2c24 <a14a97048e48471e283d76879b83d2ae323e0722
The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.
Carried in the product catalogue
An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.
- Linux — Linux
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