mm/mempolicy: fix memory leaks in weighted_interleave_auto_store()

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Summary

CVECVE-2026-46042
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:23 UTC
Updated2026-05-27 14:48:03 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mm/mempolicy: fix memory leaks in weighted_interleave_auto_store() weighted_interleave_auto_store() fetches old_wi_state inside the if (!input) block only. This causes two memory leaks: 1. When a user writes "false" and the current mode is already manual, the function returns early without freeing the freshly allocated new_wi_state. 2. When a user writes "true", old_wi_state stays NULL because the fetch is skipped entirely. The old state is then overwritten by rcu_assign_pointer() but never freed, since the cleanup path is gated on old_wi_state being non-NULL. A user can trigger this repeatedly by writing "1" in a loop. Fix both leaks by moving the old_wi_state fetch before the input check, making it unconditional. This also allows a unified early return for both "true" and "false" when the requested mode matches the current mode. Reviewed by: Donet Tom <[email protected]>

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.042650000 (date 2026-06-01)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e341f9c3c8412e57fe0042a33a2640245ecdf619 c42a7efb9060d89b72708ffaf255d0002c2164a7 git Not specified
CNA Linux Linux affected e341f9c3c8412e57fe0042a33a2640245ecdf619 39caa9ca863f96b3d00447c5aa200cabda489856 git Not specified
CNA Linux Linux affected e341f9c3c8412e57fe0042a33a2640245ecdf619 6fae274ce0e3109cbbc4c18b354eaace1f0af7d7 git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.27 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.4 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/39caa9ca863f96b3d00447c5aa200cabda489856 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c42a7efb9060d89b72708ffaf255d0002c2164a7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6fae274ce0e3109cbbc4c18b354eaace1f0af7d7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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