FKIE_CVE-2026-52905

Vulnerability from fkie_nvd - Published: 2026-06-09 14:16 - Updated: 2026-06-17 10:57
Severity
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].
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1de2db19a6028abe7d905875922faef5b873de67
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/89b6226b6c2a4add3939f361653a47c212d6ab75
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/95093e5cb4c5b50a5b1a4b79f2942b62744bd66a
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1de2db19a6028abe7d905875922faef5b873de67",
              "status": "affected",
              "version": "d8f867fa0825fb3e358457566d7326d8aab2406a",
              "versionType": "git"
            },
            {
              "lessThan": "89b6226b6c2a4add3939f361653a47c212d6ab75",
              "status": "affected",
              "version": "d8f867fa0825fb3e358457566d7326d8aab2406a",
              "versionType": "git"
            },
            {
              "lessThan": "95093e5cb4c5b50a5b1a4b79f2942b62744bd66a",
              "status": "affected",
              "version": "d8f867fa0825fb3e358457566d7326d8aab2406a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/damon/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/damon/core: disallow non-power of two min_region_sz on damon_start()\n\nCommit d8f867fa0825 (\"mm/damon: add damon_ctx-\u003emin_sz_region\") introduced\na bug that allows unaligned DAMON region address ranges.  Commit\nc80f46ac228b (\"mm/damon/core: disallow non-power of two min_region_sz\")\nfixed it, but only for damon_commit_ctx() use case.  Still, DAMON sysfs\ninterface can emit non-power of two min_region_sz via damon_start().  Fix\nthe path by adding the is_power_of_2() check on damon_start().\n\nThe issue was discovered by sashiko [1]."
    }
  ],
  "id": "CVE-2026-52905",
  "lastModified": "2026-06-17T10:57:54.030",
  "metrics": {},
  "published": "2026-06-09T14:16:44.950",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1de2db19a6028abe7d905875922faef5b873de67"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/89b6226b6c2a4add3939f361653a47c212d6ab75"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/95093e5cb4c5b50a5b1a4b79f2942b62744bd66a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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