Bug 2487004 (CVE-2026-52905) - CVE-2026-52905 kernel: mm/damon/core: disallow non-power of two min_region_sz on damon_start()
Summary: CVE-2026-52905 kernel: mm/damon/core: disallow non-power of two min_region_sz...
Keywords:
Status: NEW
Alias: CVE-2026-52905
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: ---
Assignee: Product Security
QA Contact:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-09 14:01 UTC by OSIDB Bzimport
Modified: 2026-06-09 16:30 UTC (History)
2 users (show)

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Description OSIDB Bzimport 2026-06-09 14:01:48 UTC 
In 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].
Comment 1 Keith Grant 2026-06-09 16:29:15 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026060913-CVE-2026-52905-6528@gregkh/T
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