Vulnerability-Lookup

FKIE_CVE-2026-31589

Vulnerability from fkie_nvd - Published: 2026-04-24 15:16 - Updated: 2026-06-17 10:34

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/615d9bb2ccad42f9e21d837431e401db2e471195	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b667df39d98a7a24be7c2a40ff0863dac1ad2cd7	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c330e65ea59c4805d6ab6757c4ddfe8c63acef31	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/efc52947247a21bbf79059539bbbd40f4ea76f00

Impacted products

	Vendor	Product	Version
	linux	linux_kernel	*
	linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "24221FC1-03CA-4C3B-99B7-27AFF9FC5FAE",
              "versionEndExcluding": "6.19.14",
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            }
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  "cveTags": [],
  "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."
    }
  ],
  "id": "CVE-2026-31589",
  "lastModified": "2026-06-17T10:34:02.407",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-24T15:16:34.700",
  "references": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/615d9bb2ccad42f9e21d837431e401db2e471195"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/b667df39d98a7a24be7c2a40ff0863dac1ad2cd7"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c330e65ea59c4805d6ab6757c4ddfe8c63acef31"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/efc52947247a21bbf79059539bbbd40f4ea76f00"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-04-24 14:42 – Updated: 2026-08-05 12:23

Title

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

Summary

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 CNA under the mitre root

CNA scorecard D 53/100 over 7018 records in the last 180 days details

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 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "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": [
            {
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            },
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              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
            },
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              "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"
            },
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              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.1",
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            },
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              "versionType": "original_commit_for_fix"
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        }
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      "metrics": [
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          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable path can be reached by remote NFS clients when nfsd is configured for NFSD_IO_DONTCACHE on a filesystem advertising FOP_DONTCACHE, causing remote READ/WRITE handling to set IOCB_DONTCACHE and enter the dropbehind invalidation path. This is a network-facing kernel service.\nAC:L - Once the affected DONTCACHE path is available, an attacker can repeatedly drive writeback/dropbehind and inode lifetime pressure with ordinary I/O operations. The race is attacker-influenced rather than dependent on an uncontrollable system state.\nPR:N - A remote NFS client can reach nfsd request processing without local shell access or kernel capabilities on the target; permissive or anonymous exports make the relevant file operations reachable without prior target privileges. When uncertain between N and L, N is the higher-severity defensible choice.\nUI:N - No victim user action is needed after the service and export are available. The attacker triggers the path by sending I/O requests.\nS:U - The vulnerability corrupts/uses freed memory inside the same kernel security authority that processes the request. It is not a VM escape, IOMMU bypass, or cross-authority boundary violation.\nC:H - The bug is a use-after-free of the address_space/inode-backed mapping when dereferencing mapping-\u003ea_ops after the folio no longer pins the mapping. Kernel UAFs are defensibly scored as high confidentiality impact because they can be shaped into kernel memory disclosure primitives.\nI:H - The stale mapping dereference includes an indirect free_folio function pointer lookup and potential call, making control-flow or memory corruption exploitation defensible. Kernel UAFs are scored high for integrity under the provided guidance.\nA:H - At minimum, dereferencing mapping-\u003ea_ops after the mapping has been freed can crash or oops the kernel. The attacker can trigger the vulnerable path repeatedly, so availability impact is high."
            }
          ]
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:23:40.286Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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      ],
      "title": "mm: call -\u003efree_folio() directly in folio_unmap_invalidate()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31589",
    "datePublished": "2026-04-24T14:42:16.955Z",
    "dateReserved": "2026-03-09T15:48:24.120Z",
    "dateUpdated": "2026-08-05T12:23:40.286Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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