CVE-2026-89771
CVE CVE-2026-89771EUVD EUVD-2026-76683Published 2026-09-11T19:47:10.000ZLast changed 2026-09-13T06:34:12.000ZCVSS 7.8
What the advisory describes
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix subbuf resize race with ring buffer readers trace_buffer subbuf_size is read lockless in ring_buffer_read_page() and ring_buffer_read_start(), while it can simultaneously be resized with ring_buffer_subbuf_order_set(). Instead of trace_buffer::subbuf_size, use bpage::order in ring_buffer_read_start() and ring_buffer_read_page(). In ring_buffer_read_start(), even with resize_disabled, there is still a possibility of a race with a buffer modification. Hold the trace_buffer mutex to synchronise with any pending ring buffer order modification. trace_buffer::subbuf_size is now actually useless, remove it. Also, create accessors rb_subbuf_capacity() and rb_page_capacity() which return the actual size available for storing events, while rb_subbuf_size() returns the actual subbuf page-size.
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 6.8; patch: 7.3-rc1; f9b94daa542a8d2532f0930f01cd9aec2d19621b <8a5f63637890f03177146efddaba5ec7a1b4d61f; f9b94daa542a8d2532f0930f01cd9aec2d19621b <6d666f0b8b36c0765cf19fbe6de5a7ba5a73aad9; patch: 7.2.4; f9b94daa542a8d2532f0930f01cd9aec2d19621b <0c7c517827a453128a8f58bfd849546a29813b27; patch: 0; patch: 6.18.50; patch: 6.12.109; f9b94daa542a8d2532f0930f01cd9aec2d19621b <50f4a793c4ff24826efb0ac700989a5063cc53df
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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