CVE-2026-89500: Linux

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page Discarding a cached reader page after a concurrent ring buffer resize uses the new global subbuf_order for the free_pages() call. This mismatched order may crashes the kernel or leaks memory because the cached page was allocated under the old size. Save the actual free_page order alongside the page address to ensure we always refer to the correct value and do not rely on the potentially stalled cpu_buffer->subbuf_order value. The simplest is to make free_page a buffer_data_read_page which already covers exactly what we need: a page address and a page order.

Засегнати продукти

• Linux Linux: 8e7b58c27b3c567316a51079b375b846f9223bba преди d8f52dc3c3f1f987d8cf920ccd8d66590870bf3f; 8e7b58c27b3c567316a51079b375b846f9223bba преди a1dabe68fb53730bc0be60c5dbfd3f4c560084e7; 8e7b58c27b3c567316a51079b375b846f9223bba преди d787d509bdf6c88c85e095247daf7456cb7fb772; 8e7b58c27b3c567316a51079b375b846f9223bba преди 7a1fb95de5404134f8758c1295ce88986bdf117c
• Linux Linux: 6.8; преди 6.8; 6.12.112 до 6.12.*; 6.18.51 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-2026-89500
• https://nvd.nist.gov/vuln/detail/CVE-2026-89500
• https://git.kernel.org/stable/c/d8f52dc3c3f1f987d8cf920ccd8d66590870bf3f
• https://git.kernel.org/stable/c/a1dabe68fb53730bc0be60c5dbfd3f4c560084e7
• https://git.kernel.org/stable/c/d787d509bdf6c88c85e095247daf7456cb7fb772
• https://git.kernel.org/stable/c/7a1fb95de5404134f8758c1295ce88986bdf117c