ring-buffer: Make cpu_buffer::free_page a buffer_data_read_page

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89500
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:32 UTC
Updated2026-09-11 20:19:32 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8e7b58c27b3c567316a51079b375b846f9223bba a1dabe68fb53730bc0be60c5dbfd3f4c560084e7 git Not specified
CNA Linux Linux affected 8e7b58c27b3c567316a51079b375b846f9223bba d787d509bdf6c88c85e095247daf7456cb7fb772 git Not specified
CNA Linux Linux affected 8e7b58c27b3c567316a51079b375b846f9223bba 7a1fb95de5404134f8758c1295ce88986bdf117c git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/a1dabe68fb53730bc0be60c5dbfd3f4c560084e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7a1fb95de5404134f8758c1295ce88986bdf117c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d787d509bdf6c88c85e095247daf7456cb7fb772 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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