ring-buffer: Fix subbuf resize race with ring_buffer_alloc_read_page()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89503
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: Fix subbuf resize race with ring_buffer_alloc_read_page() ring_buffer_alloc_read_page() is racy with ring_buffer_subbuf_order_set, it can allocate a reader page with an outdated order. This isn't a big issue, the user can still re-allocate a new reader page and try again. However, what is more problematic is if the value of subbuf_order changes in the middle of ring_buffer_alloc_read_page(). In that case, bpage->order might not match the actual allocated memory. Use bpage->order for the allocation to prevent this race.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected bce761d757452ba5eb77e11fecc37a04b67494e7 2dc510957fe8fd098ab3c3147ebdf34d00cd2734 git Not specified
CNA Linux Linux affected bce761d757452ba5eb77e11fecc37a04b67494e7 53106e9262a310ef2c9a9321168c03705940c678 git Not specified
CNA Linux Linux affected bce761d757452ba5eb77e11fecc37a04b67494e7 e743527c5bfdceda1095bc0a9e596e2aebb6a9c3 git Not specified
CNA Linux Linux affected 6.8 Not specified
CNA Linux Linux unaffected 6.8 semver Not specified
CNA Linux Linux unaffected 6.18.50 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/2dc510957fe8fd098ab3c3147ebdf34d00cd2734 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/53106e9262a310ef2c9a9321168c03705940c678 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e743527c5bfdceda1095bc0a9e596e2aebb6a9c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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