CVE-2026-52905
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].
Affected versions
Linux kernel versions
6.18
and later are affected. Fixed in
6.18.30,
7.0.4,
7.1-rc1
and their respective stable series.
References
The following references provide additional information about CVE-2026-52905 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/1de2db19a6028abe7d905875922faef5b873de67
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PatchKernel patch commithttps://git.kernel.org/stable/c/89b6226b6c2a4add3939f361653a47c212d6ab75
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PatchKernel patch commithttps://git.kernel.org/stable/c/95093e5cb4c5b50a5b1a4b79f2942b62744bd66a
Frequently asked questions
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What is CVE-2026-52905?
CVE-2026-52905 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.18 onward and has been patched in 6.18.30, 7.0.4 and 7.1-rc1. CVE-2026-52905 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-52905?
Yes — CVE-2026-52905 has been patched. Fixed versions include 6.18.30, 7.0.4 and 7.1-rc1. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-52905 actively exploited?
No — CVE-2026-52905 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.