CVE-2026-89500
CVE CVE-2026-89500EUVD EUVD-2026-76406Published 2026-09-11T19:43:49.000ZLast changed 2026-09-13T06:30:07.000ZCVSS 7.8
What the advisory describes
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.
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: 6.18.51; 8e7b58c27b3c567316a51079b375b846f9223bba <7a1fb95de5404134f8758c1295ce88986bdf117c; 8e7b58c27b3c567316a51079b375b846f9223bba <a1dabe68fb53730bc0be60c5dbfd3f4c560084e7; 6.8; 8e7b58c27b3c567316a51079b375b846f9223bba <d787d509bdf6c88c85e095247daf7456cb7fb772; patch: 7.3-rc1; patch: 7.2.4; patch: 0
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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