Vulnerability-Lookup

GHSA-44F9-RXJ6-P8RG

Vulnerability from github – Published: 2026-06-03 18:33 – Updated: 2026-06-03 18:33

Details

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

NFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages

LOCALIO is an NFS loopback mount optimization that avoids using the network for READ, WRITE and COMMIT if the NFS client and server are determined to be on the same system. But because LOCALIO is still fundamentally "just NFS loopback mount" it is susceptible to recursion deadlock via direct reclaim, e.g.: NFS LOCALIO down to XFS and then back into NFS via nfs_writepages.

Fix LOCALIO's potential for direct reclaim deadlock by ensuring that all its page cache allocations are done from GFP_NOFS context.

Thanks to Ben Coddington for pointing out commit ad22c7a043c2 ("xfs: prevent stack overflows from page cache allocation").

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-46256"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-03T18:16:26Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages\n\nLOCALIO is an NFS loopback mount optimization that avoids using the\nnetwork for READ, WRITE and COMMIT if the NFS client and server are\ndetermined to be on the same system. But because LOCALIO is still\nfundamentally \"just NFS loopback mount\" it is susceptible to recursion\ndeadlock via direct reclaim, e.g.: NFS LOCALIO down to XFS and then\nback into NFS via nfs_writepages.\n\nFix LOCALIO\u0027s potential for direct reclaim deadlock by ensuring that\nall its page cache allocations are done from GFP_NOFS context.\n\nThanks to Ben Coddington for pointing out commit ad22c7a043c2 (\"xfs:\nprevent stack overflows from page cache allocation\").",
  "id": "GHSA-44f9-rxj6-p8rg",
  "modified": "2026-06-03T18:33:12Z",
  "published": "2026-06-03T18:33:12Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46256"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67435d2d8a33a75f9647724952cb1b18279d2e95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae26a4cf2baf0a44c538dc093504d1994b02dade"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-46256 (GCVE-0-2026-46256)

Vulnerability from cvelistv5 – Published: 2026-06-03 15:49 – Updated: 2026-06-03 15:49

Title

NFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages

Summary

In the Linux kernel, the following vulnerability has been resolved: NFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages LOCALIO is an NFS loopback mount optimization that avoids using the network for READ, WRITE and COMMIT if the NFS client and server are determined to be on the same system. But because LOCALIO is still fundamentally "just NFS loopback mount" it is susceptible to recursion deadlock via direct reclaim, e.g.: NFS LOCALIO down to XFS and then back into NFS via nfs_writepages. Fix LOCALIO's potential for direct reclaim deadlock by ensuring that all its page cache allocations are done from GFP_NOFS context. Thanks to Ben Coddington for pointing out commit ad22c7a043c2 ("xfs: prevent stack overflows from page cache allocation").

Severity

No CVSS data available.

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/ae26a4cf2baf0a44c…
https://git.kernel.org/stable/c/6a5de0c4fc0f217ee…
https://git.kernel.org/stable/c/67435d2d8a33a75f9…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 70ba381e1a431245c137ed597ec6a05991c79bd9 , < ae26a4cf2baf0a44c538dc093504d1994b02dade (git) Affected: 70ba381e1a431245c137ed597ec6a05991c79bd9 , < 6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9 (git) Affected: 70ba381e1a431245c137ed597ec6a05991c79bd9 , < 67435d2d8a33a75f9647724952cb1b18279d2e95 (git)
Linux	Linux	Affected: 6.12 Unaffected: 0 , < 6.12 (semver) Unaffected: 6.18.14 , ≤ 6.18.* (semver) Unaffected: 6.19.4 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/localio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ae26a4cf2baf0a44c538dc093504d1994b02dade",
              "status": "affected",
              "version": "70ba381e1a431245c137ed597ec6a05991c79bd9",
              "versionType": "git"
            },
            {
              "lessThan": "6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9",
              "status": "affected",
              "version": "70ba381e1a431245c137ed597ec6a05991c79bd9",
              "versionType": "git"
            },
            {
              "lessThan": "67435d2d8a33a75f9647724952cb1b18279d2e95",
              "status": "affected",
              "version": "70ba381e1a431245c137ed597ec6a05991c79bd9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfs/localio.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.14",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages\n\nLOCALIO is an NFS loopback mount optimization that avoids using the\nnetwork for READ, WRITE and COMMIT if the NFS client and server are\ndetermined to be on the same system. But because LOCALIO is still\nfundamentally \"just NFS loopback mount\" it is susceptible to recursion\ndeadlock via direct reclaim, e.g.: NFS LOCALIO down to XFS and then\nback into NFS via nfs_writepages.\n\nFix LOCALIO\u0027s potential for direct reclaim deadlock by ensuring that\nall its page cache allocations are done from GFP_NOFS context.\n\nThanks to Ben Coddington for pointing out commit ad22c7a043c2 (\"xfs:\nprevent stack overflows from page cache allocation\")."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-03T15:49:53.168Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ae26a4cf2baf0a44c538dc093504d1994b02dade"
        },
        {
          "url": "https://git.kernel.org/stable/c/6a5de0c4fc0f217eea945d3d72c34ee30d72cbc9"
        },
        {
          "url": "https://git.kernel.org/stable/c/67435d2d8a33a75f9647724952cb1b18279d2e95"
        }
      ],
      "title": "NFS/localio: prevent direct reclaim recursion into NFS via nfs_writepages",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46256",
    "datePublished": "2026-06-03T15:49:53.168Z",
    "dateReserved": "2026-05-13T15:03:33.108Z",
    "dateUpdated": "2026-06-03T15:49:53.168Z",
    "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.

Action not permitted

GHSA-44F9-RXJ6-P8RG

CVE-2026-46256 (GCVE-0-2026-46256)

Tags

Sightings

Nomenclature