CVE-2026-89771: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: f9b94daa542a8d2532f0930f01cd9aec2d19621b преди 6d666f0b8b36c0765cf19fbe6de5a7ba5a73aad9; f9b94daa542a8d2532f0930f01cd9aec2d19621b преди 50f4a793c4ff24826efb0ac700989a5063cc53df; f9b94daa542a8d2532f0930f01cd9aec2d19621b преди 0c7c517827a453128a8f58bfd849546a29813b27; f9b94daa542a8d2532f0930f01cd9aec2d19621b преди 8a5f63637890f03177146efddaba5ec7a1b4d61f
• Linux Linux: 6.8; преди 6.8; 6.12.109 до 6.12.*; 6.18.50 до 6.18.*; 7.2.4 до 7.2.*; от 7.3 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-89771
• https://nvd.nist.gov/vuln/detail/CVE-2026-89771
• https://git.kernel.org/stable/c/6d666f0b8b36c0765cf19fbe6de5a7ba5a73aad9
• https://git.kernel.org/stable/c/50f4a793c4ff24826efb0ac700989a5063cc53df
• https://git.kernel.org/stable/c/0c7c517827a453128a8f58bfd849546a29813b27
• https://git.kernel.org/stable/c/8a5f63637890f03177146efddaba5ec7a1b4d61f