Vulnerability-Lookup

FKIE_CVE-2025-71292

Vulnerability from fkie_nvd - Published: 2026-05-06 12:16 - Updated: 2026-07-30 06:24

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: jfs: nlink overflow in jfs_rename If nlink is maximal for a directory (-1) and inside that directory you perform a rename for some child directory (not moving from the parent), then the nlink of the first directory is first incremented and later decremented. Normally this is fine, but when nlink = -1 this causes a wrap around to 0, and then drop_nlink issues a warning. After applying the patch syzbot no longer issues any warnings. I also ran some basic fs tests to look for any regressions.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2108829a59f081e822fdab8c2cd7131deb8aa8a1	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5d77c36cd4b698649f5c30c5f6c084f4f61d1880	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9218dc26fd922b09858ecd3666ed57dfd8098da8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/93c325746ae59709b4f9bad4e3e4761c8d566c70	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a3d66089e50a6e0142f8884471f74292102ea9aa	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b4330a0d0947fbdc9d445cbbeabd8cc910a8c9ca	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f70fcbc2ac7c24f087a2c895c5753aa730b1e479	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/fe136426e30ca6debcf916fd6a141555ed9fde74	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12

JSON

To clipboard

{
  "affected": [
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      "affectedData": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/jfs/namei.c"
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              "versionType": "git"
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              "status": "unaffected",
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.202",
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              "status": "unaffected",
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          ]
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      ],
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    }
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: nlink overflow in jfs_rename\n\nIf nlink is maximal for a directory (-1) and inside that directory you\nperform a rename for some child directory (not moving from the parent),\nthen the nlink of the first directory is first incremented and later\ndecremented. Normally this is fine, but when nlink = -1 this causes a\nwrap around to 0, and then drop_nlink issues a warning.\n\nAfter applying the patch syzbot no longer issues any warnings. I also\nran some basic fs tests to look for any regressions."
    }
  ],
  "id": "CVE-2025-71292",
  "lastModified": "2026-07-30T06:24:57.520",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
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        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
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          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-05-06T12:16:28.453",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/2108829a59f081e822fdab8c2cd7131deb8aa8a1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/5d77c36cd4b698649f5c30c5f6c084f4f61d1880"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/9218dc26fd922b09858ecd3666ed57dfd8098da8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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      "tags": [
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    },
    {
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    },
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    },
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-71292 (GCVE-0-2025-71292)

Vulnerability from cvelistv5 – Published: 2026-05-06 11:32 – Updated: 2026-08-05 12:12

Title

jfs: nlink overflow in jfs_rename

Summary

Severity

7.5 (High)


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

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/2108829a59f081e82…
https://git.kernel.org/stable/c/b4330a0d0947fbdc9…
https://git.kernel.org/stable/c/a3d66089e50a6e014…
https://git.kernel.org/stable/c/f70fcbc2ac7c24f08…
https://git.kernel.org/stable/c/5d77c36cd4b698649…
https://git.kernel.org/stable/c/fe136426e30ca6deb…
https://git.kernel.org/stable/c/93c325746ae59709b…
https://git.kernel.org/stable/c/9218dc26fd922b098…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2108829a59f081e822fdab8c2cd7131deb8aa8a1 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b4330a0d0947fbdc9d445cbbeabd8cc910a8c9ca (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a3d66089e50a6e0142f8884471f74292102ea9aa (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f70fcbc2ac7c24f087a2c895c5753aa730b1e479 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 5d77c36cd4b698649f5c30c5f6c084f4f61d1880 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < fe136426e30ca6debcf916fd6a141555ed9fde74 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 93c325746ae59709b4f9bad4e3e4761c8d566c70 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9218dc26fd922b09858ecd3666ed57dfd8098da8 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.252 , ≤ 5.10.* (semver) Unaffected: 5.15.202 , ≤ 5.15.* (semver) Unaffected: 6.1.165 , ≤ 6.1.* (semver) Unaffected: 6.6.128 , ≤ 6.6.* (semver) Unaffected: 6.12.75 , ≤ 6.12.* (semver) Unaffected: 6.18.16 , ≤ 6.18.* (semver) Unaffected: 6.19.6 , ≤ 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/jfs/namei.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            },
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              "status": "unaffected",
              "version": "5.15.202",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.1.165",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.75",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "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": "5.10.252",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.202",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.165",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.128",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.75",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.16",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.6",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\njfs: nlink overflow in jfs_rename\n\nIf nlink is maximal for a directory (-1) and inside that directory you\nperform a rename for some child directory (not moving from the parent),\nthen the nlink of the first directory is first incremented and later\ndecremented. Normally this is fine, but when nlink = -1 this causes a\nwrap around to 0, and then drop_nlink issues a warning.\n\nAfter applying the patch syzbot no longer issues any warnings. I also\nran some basic fs tests to look for any regressions."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - An NFSv3/v4 RENAME on an exported JFS directory follows SunRPC dispatch through nfsd_rename and vfs_rename into jfs_rename. Thus a remote NFS client can reach the vulnerable code.\nAC:L - With the parent nlink at 0xffffffff, one same-parent directory rename deterministically triggers the wrap and warning. No race is required, and the filesystem state can be attacker-controlled.\nPR:N - A writable NFS export permitting anonymous or AUTH_NULL access requires no account or prior privileges. nfsd\u0027s export and directory permission checks still permit the operation when the anonymous identity has write access.\nUI:N - The attacker directly submits the RENAME operation after the affected filesystem state exists. No separate victim action is required in an already mounted and exported JFS deployment.\nS:U - The warning and resulting denial of service affect the same kernel and host processing the filesystem operation. No virtualization, IOMMU, or other security boundary is crossed.\nC:N - The overflow affects only the unsigned link-count field and does not read or disclose memory. The count is restored before the successful transaction commits.\nI:N - There is no out-of-bounds access, use-after-free, or arbitrary write primitive. On the successful path the transient zero link count is restored to 0xffffffff before metadata is dirtied or committed.\nA:H - The repeatable WARN_ON can panic the kernel when panic_on_warn or an applicable warn_limit is configured. Even without those settings, repeated remote renames can continuously generate expensive warning traces."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:12:42.348Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2108829a59f081e822fdab8c2cd7131deb8aa8a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/b4330a0d0947fbdc9d445cbbeabd8cc910a8c9ca"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3d66089e50a6e0142f8884471f74292102ea9aa"
        },
        {
          "url": "https://git.kernel.org/stable/c/f70fcbc2ac7c24f087a2c895c5753aa730b1e479"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d77c36cd4b698649f5c30c5f6c084f4f61d1880"
        },
        {
          "url": "https://git.kernel.org/stable/c/fe136426e30ca6debcf916fd6a141555ed9fde74"
        },
        {
          "url": "https://git.kernel.org/stable/c/93c325746ae59709b4f9bad4e3e4761c8d566c70"
        },
        {
          "url": "https://git.kernel.org/stable/c/9218dc26fd922b09858ecd3666ed57dfd8098da8"
        }
      ],
      "title": "jfs: nlink overflow in jfs_rename",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71292",
    "datePublished": "2026-05-06T11:32:23.897Z",
    "dateReserved": "2026-05-06T11:31:45.509Z",
    "dateUpdated": "2026-08-05T12:12:42.348Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.

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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FKIE_CVE-2025-71292

CVE-2025-71292 (GCVE-0-2025-71292)

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Sightings

Nomenclature

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