Vulnerability-Lookup

GHSA-MG7H-Q7HW-M596

Vulnerability from github – Published: 2026-04-24 15:32 – Updated: 2026-05-07 06:31

Details

In the Linux kernel, the following vulnerability has been resolved:

mm: call ->free_folio() directly in folio_unmap_invalidate()

We can only call filemap_free_folio() if we have a reference to (or hold a lock on) the mapping. Otherwise, we've already removed the folio from the mapping so it no longer pins the mapping and the mapping can be removed, causing a use-after-free when accessing mapping->a_ops.

Follow the same pattern as __remove_mapping() and load the free_folio function pointer before dropping the lock on the mapping. That lets us make filemap_free_folio() static as this was the only caller outside filemap.c.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31589"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-24T15:16:34Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: call -\u003efree_folio() directly in folio_unmap_invalidate()\n\nWe can only call filemap_free_folio() if we have a reference to (or hold a\nlock on) the mapping.  Otherwise, we\u0027ve already removed the folio from the\nmapping so it no longer pins the mapping and the mapping can be removed,\ncausing a use-after-free when accessing mapping-\u003ea_ops.\n\nFollow the same pattern as __remove_mapping() and load the free_folio\nfunction pointer before dropping the lock on the mapping.  That lets us\nmake filemap_free_folio() static as this was the only caller outside\nfilemap.c.",
  "id": "GHSA-mg7h-q7hw-m596",
  "modified": "2026-05-07T06:31:40Z",
  "published": "2026-04-24T15:32:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31589"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/615d9bb2ccad42f9e21d837431e401db2e471195"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b667df39d98a7a24be7c2a40ff0863dac1ad2cd7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c330e65ea59c4805d6ab6757c4ddfe8c63acef31"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/efc52947247a21bbf79059539bbbd40f4ea76f00"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-31589 (GCVE-0-2026-31589)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-05-11 22:11

Title

mm: call ->free_folio() directly in folio_unmap_invalidate()

Summary

In the Linux kernel, the following vulnerability has been resolved: mm: call ->free_folio() directly in folio_unmap_invalidate() We can only call filemap_free_folio() if we have a reference to (or hold a lock on) the mapping. Otherwise, we've already removed the folio from the mapping so it no longer pins the mapping and the mapping can be removed, causing a use-after-free when accessing mapping->a_ops. Follow the same pattern as __remove_mapping() and load the free_folio function pointer before dropping the lock on the mapping. That lets us make filemap_free_folio() static as this was the only caller outside filemap.c.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/efc52947247a21bbf…
https://git.kernel.org/stable/c/b667df39d98a7a24b…
https://git.kernel.org/stable/c/c330e65ea59c4805d…
https://git.kernel.org/stable/c/615d9bb2ccad42f9e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fb7d3bc4149395c1ae99029c852eab6c28fc3c88 , < efc52947247a21bbf79059539bbbd40f4ea76f00 (git) Affected: fb7d3bc4149395c1ae99029c852eab6c28fc3c88 , < b667df39d98a7a24be7c2a40ff0863dac1ad2cd7 (git) Affected: fb7d3bc4149395c1ae99029c852eab6c28fc3c88 , < c330e65ea59c4805d6ab6757c4ddfe8c63acef31 (git) Affected: fb7d3bc4149395c1ae99029c852eab6c28fc3c88 , < 615d9bb2ccad42f9e21d837431e401db2e471195 (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.27 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0.1 , ≤ 7.0.* (semver) Unaffected: 7.1-rc1 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/filemap.c",
            "mm/internal.h",
            "mm/truncate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "efc52947247a21bbf79059539bbbd40f4ea76f00",
              "status": "affected",
              "version": "fb7d3bc4149395c1ae99029c852eab6c28fc3c88",
              "versionType": "git"
            },
            {
              "lessThan": "b667df39d98a7a24be7c2a40ff0863dac1ad2cd7",
              "status": "affected",
              "version": "fb7d3bc4149395c1ae99029c852eab6c28fc3c88",
              "versionType": "git"
            },
            {
              "lessThan": "c330e65ea59c4805d6ab6757c4ddfe8c63acef31",
              "status": "affected",
              "version": "fb7d3bc4149395c1ae99029c852eab6c28fc3c88",
              "versionType": "git"
            },
            {
              "lessThan": "615d9bb2ccad42f9e21d837431e401db2e471195",
              "status": "affected",
              "version": "fb7d3bc4149395c1ae99029c852eab6c28fc3c88",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/filemap.c",
            "mm/internal.h",
            "mm/truncate.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.27",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.1",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.27",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                }
              ],
              "negate": false,
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: call -\u003efree_folio() directly in folio_unmap_invalidate()\n\nWe can only call filemap_free_folio() if we have a reference to (or hold a\nlock on) the mapping.  Otherwise, we\u0027ve already removed the folio from the\nmapping so it no longer pins the mapping and the mapping can be removed,\ncausing a use-after-free when accessing mapping-\u003ea_ops.\n\nFollow the same pattern as __remove_mapping() and load the free_folio\nfunction pointer before dropping the lock on the mapping.  That lets us\nmake filemap_free_folio() static as this was the only caller outside\nfilemap.c."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T22:11:42.830Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/efc52947247a21bbf79059539bbbd40f4ea76f00"
        },
        {
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        },
        {
          "url": "https://git.kernel.org/stable/c/c330e65ea59c4805d6ab6757c4ddfe8c63acef31"
        },
        {
          "url": "https://git.kernel.org/stable/c/615d9bb2ccad42f9e21d837431e401db2e471195"
        }
      ],
      "title": "mm: call -\u003efree_folio() directly in folio_unmap_invalidate()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31589",
    "datePublished": "2026-04-24T14:42:16.955Z",
    "dateReserved": "2026-03-09T15:48:24.120Z",
    "dateUpdated": "2026-05-11T22:11:42.830Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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GHSA-MG7H-Q7HW-M596

CVE-2026-31589 (GCVE-0-2026-31589)

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Sightings

Nomenclature