Answer in brief
CVE-2026-89500 records a High severity (CVSS 7.8) vulnerability in ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8e7b58c27b3c567316a51079b375b846f9223bba <a1dabe68fb53730bc0be60c5dbfd3f4c560084e7 || >=8e7b58c27b3c567316a51079b375b846f9223bba <d787d509bdf6c88c85e095247daf7456cb7fb772 || >=8e7b58c27b3c567316a51079b375b846f9223bba <7a1fb95de5404134f8758c1295ce88986bdf117c | a1dabe68fb53730bc0be60c5dbfd3f4c560084e7, d787d509bdf6c88c85e095247daf7456cb7fb772, 7a1fb95de5404134f8758c1295ce88986bdf117c |
| Linux/Linuxgeneric | >=8e7b58c27b3c567316a51079b375b846f9223bba <d8f52dc3c3f1f987d8cf920ccd8d66590870bf3f || >=8e7b58c27b3c567316a51079b375b846f9223bba <a1dabe68fb53730bc0be60c5dbfd3f4c560084e7 || >=8e7b58c27b3c567316a51079b375b846f9223bba <d787d509bdf6c88c85e095247daf7456cb7fb772 || >=8e7b58c27b3c567316a51079b375b846f9223bba <7a1fb95de5404134f8758c1295ce88986bdf117c | d8f52dc3c3f1f987d8cf920ccd8d66590870bf3f, a1dabe68fb53730bc0be60c5dbfd3f4c560084e7, d787d509bdf6c88c85e095247daf7456cb7fb772, 7a1fb95de5404134f8758c1295ce88986bdf117c |
| Linux/Linuxgeneric | 6.8 | Not reported |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.