mm/damon/core: disallow non-power of two min_region_sz on damon_start()

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Summary

CVECVE-2026-52905
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-09 14:16:44 UTC
Updated2026-06-09 14:16:44 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mm/damon/core: disallow non-power of two min_region_sz on damon_start() Commit d8f867fa0825 ("mm/damon: add damon_ctx->min_sz_region") introduced a bug that allows unaligned DAMON region address ranges. Commit c80f46ac228b ("mm/damon/core: disallow non-power of two min_region_sz") fixed it, but only for damon_commit_ctx() use case. Still, DAMON sysfs interface can emit non-power of two min_region_sz via damon_start(). Fix the path by adding the is_power_of_2() check on damon_start(). The issue was discovered by sashiko [1].

Risk And Classification

EPSS: 0.000170000 probability, percentile 0.042700000 (date 2026-06-12)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d8f867fa0825fb3e358457566d7326d8aab2406a 1de2db19a6028abe7d905875922faef5b873de67 git Not specified
CNA Linux Linux affected d8f867fa0825fb3e358457566d7326d8aab2406a 89b6226b6c2a4add3939f361653a47c212d6ab75 git Not specified
CNA Linux Linux affected d8f867fa0825fb3e358457566d7326d8aab2406a 95093e5cb4c5b50a5b1a4b79f2942b62744bd66a git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.30 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/89b6226b6c2a4add3939f361653a47c212d6ab75 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/95093e5cb4c5b50a5b1a4b79f2942b62744bd66a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1de2db19a6028abe7d905875922faef5b873de67 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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