CVE-2026-89500ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 8e7b58c27b3c567316a51079b375b846f9223bba before d8f52dc3c3f1f987d8cf920ccd8d66590870bf3f; from 8e7b58c27b3c567316a51079b375b846f9223bba before a1dabe68fb53730bc0be60c5dbfd3f4c560084e7; from 8e7b58c27b3c567316a51079b375b846f9223bba before d787d509bdf6c88c85e095247daf7456cb7fb772; 8e7b58c27b3c567316a51079b375b846f9223bba builds before 7a1fb95de5404134f8758c1295ce88986bdf117c | CNA record |
References
- 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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.