github - ghsa-74qv-83cv-fw98

GHSA-74QV-83CV-FW98

Vulnerability from github – Published: 2025-07-25 15:30 – Updated: 2025-11-19 21:31

Details

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

smb: client: fix regression with native SMB symlinks

Some users and customers reported that their backup/copy tools started to fail when the directory being copied contained symlink targets that the client couldn't parse - even when those symlinks weren't followed.

Fix this by allowing lstat(2) and readlink(2) to succeed even when the client can't resolve the symlink target, restoring old behavior.

Severity ?

5.5 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-38431"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-07-25T15:15:28Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix regression with native SMB symlinks\n\nSome users and customers reported that their backup/copy tools started\nto fail when the directory being copied contained symlink targets that\nthe client couldn\u0027t parse - even when those symlinks weren\u0027t followed.\n\nFix this by allowing lstat(2) and readlink(2) to succeed even when the\nclient can\u0027t resolve the symlink target, restoring old behavior.",
  "id": "GHSA-74qv-83cv-fw98",
  "modified": "2025-11-19T21:31:17Z",
  "published": "2025-07-25T15:30:54Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38431"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ddaf7567080c7de2e0c99efca2ee1e6b79beea5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ff8abbd248c1f52df0c321690b88454b13ff54b2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-38431 (GCVE-0-2025-38431)

Vulnerability from cvelistv5 – Published: 2025-07-25 14:22 – Updated: 2025-07-28 04:22

Summary

In the Linux kernel, the following vulnerability has been resolved: smb: client: fix regression with native SMB symlinks Some users and customers reported that their backup/copy tools started to fail when the directory being copied contained symlink targets that the client couldn't parse - even when those symlinks weren't followed. Fix this by allowing lstat(2) and readlink(2) to succeed even when the client can't resolve the symlink target, restoring old behavior.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/6ddaf7567080c7de2…
	https://git.kernel.org/stable/c/ff8abbd248c1f52df…

Impacted products

Vendor

Product

Version

Linux

Affected: 12b466eb52d926802b6898d2cb7e67386467f54a , < 6ddaf7567080c7de2e0c99efca2ee1e6b79beea5 (git)
Affected: 12b466eb52d926802b6898d2cb7e67386467f54a , < ff8abbd248c1f52df0c321690b88454b13ff54b2 (git)

Linux

Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.15.5 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/reparse.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6ddaf7567080c7de2e0c99efca2ee1e6b79beea5",
              "status": "affected",
              "version": "12b466eb52d926802b6898d2cb7e67386467f54a",
              "versionType": "git"
            },
            {
              "lessThan": "ff8abbd248c1f52df0c321690b88454b13ff54b2",
              "status": "affected",
              "version": "12b466eb52d926802b6898d2cb7e67386467f54a",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/reparse.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": "6.15.*",
              "status": "unaffected",
              "version": "6.15.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15.5",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.16",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix regression with native SMB symlinks\n\nSome users and customers reported that their backup/copy tools started\nto fail when the directory being copied contained symlink targets that\nthe client couldn\u0027t parse - even when those symlinks weren\u0027t followed.\n\nFix this by allowing lstat(2) and readlink(2) to succeed even when the\nclient can\u0027t resolve the symlink target, restoring old behavior."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-07-28T04:22:03.224Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6ddaf7567080c7de2e0c99efca2ee1e6b79beea5"
        },
        {
          "url": "https://git.kernel.org/stable/c/ff8abbd248c1f52df0c321690b88454b13ff54b2"
        }
      ],
      "title": "smb: client: fix regression with native SMB symlinks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38431",
    "datePublished": "2025-07-25T14:22:34.363Z",
    "dateReserved": "2025-04-16T04:51:24.015Z",
    "dateUpdated": "2025-07-28T04:22:03.224Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

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-74QV-83CV-FW98

CVE-2025-38431 (GCVE-0-2025-38431)

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Nomenclature