Vulnerability-Lookup

GHSA-Q36J-3HM6-HH2W

Vulnerability from github – Published: 2026-06-09 15:32 – Updated: 2026-06-09 15:32

Details

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].

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{
  "affected": [],
  "aliases": [
    "CVE-2026-52905"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-09T14:16:44Z",
    "severity": null
  },
  "details": "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": "GHSA-q36j-3hm6-hh2w",
  "modified": "2026-06-09T15:32:19Z",
  "published": "2026-06-09T15:32:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-52905"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1de2db19a6028abe7d905875922faef5b873de67"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/89b6226b6c2a4add3939f361653a47c212d6ab75"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/95093e5cb4c5b50a5b1a4b79f2942b62744bd66a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-52905 (GCVE-0-2026-52905)

Vulnerability from cvelistv5 – Published: 2026-06-09 12:36 – Updated: 2026-06-09 12:36

Title

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

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].

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/1de2db19a6028abe7…
https://git.kernel.org/stable/c/89b6226b6c2a4add3…
https://git.kernel.org/stable/c/95093e5cb4c5b50a5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d8f867fa0825fb3e358457566d7326d8aab2406a , < 1de2db19a6028abe7d905875922faef5b873de67 (git) Affected: d8f867fa0825fb3e358457566d7326d8aab2406a , < 89b6226b6c2a4add3939f361653a47c212d6ab75 (git) Affected: d8f867fa0825fb3e358457566d7326d8aab2406a , < 95093e5cb4c5b50a5b1a4b79f2942b62744bd66a (git)
Linux	Linux	Affected: 6.18 Unaffected: 0 , < 6.18 (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.4 , ≤ 7.0.* (semver) Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "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": [
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              "status": "affected",
              "version": "d8f867fa0825fb3e358457566d7326d8aab2406a",
              "versionType": "git"
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              "version": "d8f867fa0825fb3e358457566d7326d8aab2406a",
              "versionType": "git"
            },
            {
              "lessThan": "95093e5cb4c5b50a5b1a4b79f2942b62744bd66a",
              "status": "affected",
              "version": "d8f867fa0825fb3e358457566d7326d8aab2406a",
              "versionType": "git"
            }
          ]
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          "programFiles": [
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          "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"
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              "status": "unaffected",
              "version": "7.1-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.18",
                  "vulnerable": true
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                  "vulnerable": true
                }
              ],
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              "operator": "OR"
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        }
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      "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]."
        }
      ],
      "providerMetadata": {
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        {
          "url": "https://git.kernel.org/stable/c/95093e5cb4c5b50a5b1a4b79f2942b62744bd66a"
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      ],
      "title": "mm/damon/core: disallow non-power of two min_region_sz on damon_start()",
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    "datePublished": "2026-06-09T12:36:02.516Z",
    "dateReserved": "2026-06-09T07:44:35.366Z",
    "dateUpdated": "2026-06-09T12:36:02.516Z",
    "state": "PUBLISHED"
  },
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-Q36J-3HM6-HH2W

CVE-2026-52905 (GCVE-0-2026-52905)

Tags

Sightings

Nomenclature