CVE-2026-52905
N/A
N/A
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | d8f867fa0825fb3e358457566d7326d8aab2406a < 1de2db19a6028abe7d905875922faef5b873de67 | affected |
| Linux | Linux | d8f867fa0825fb3e358457566d7326d8aab2406a < 89b6226b6c2a4add3939f361653a47c212d6ab75 | affected |
| Linux | Linux | d8f867fa0825fb3e358457566d7326d8aab2406a < 95093e5cb4c5b50a5b1a4b79f2942b62744bd66a | affected |
| Linux | Linux | 6.18 | affected |
| Linux | Linux | 0 < 6.18 | unaffected |
| Linux | Linux | 6.18.30 <= 6.18.* | unaffected |
| Linux | Linux | 7.0.4 <= 7.0.* | unaffected |
| Linux | Linux | 7.1 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/1de2db19a6028abe7d905875922faef5b873de67
- https://git.kernel.org/stable/c/89b6226b6c2a4add3939f361653a47c212d6ab75
- https://git.kernel.org/stable/c/95093e5cb4c5b50a5b1a4b79f2942b62744bd66a
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