Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 8e7b58c27b3c567316a51079b375b846f9223bba before d8f52dc3c3f1f987d8cf920ccd8d66590870bf3f; affected 8e7b58c27b3c567316a51079b375b846f9223bba before a1dabe68fb53730bc0be60c5dbfd3f4c560084e7; affected 8e7b58c27b3c567316a51079b375b846f9223bba before d787d509bdf6c88c85e095247daf7456cb7fb772; affected 8e7b58c27b3c567316a51079b375b846f9223bba before 7a1fb95de5404134f8758c1295ce88986bdf117c |
| Linux / Linux | affected 6.8; unaffected 0 before 6.8; unaffected 6.12.112 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.