Vulnerability-Lookup

GHSA-3X67-44WH-MRGF

Vulnerability from github – Published: 2025-05-20 18:30 – Updated: 2025-11-10 21:30

Details

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

ksmbd: fix use-after-free in kerberos authentication

Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on the session and make use of sess->user after it has been passed to ksmbd_free_user but before sess->user is set to NULL.

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-37924"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-20T16:15:29Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in kerberos authentication\n\nSetting sess-\u003euser = NULL was introduced to fix the dangling pointer\ncreated by ksmbd_free_user. However, it is possible another thread could\nbe operating on the session and make use of sess-\u003euser after it has been\npassed to ksmbd_free_user but before sess-\u003euser is set to NULL.",
  "id": "GHSA-3x67-44wh-mrgf",
  "modified": "2025-11-10T21:30:30Z",
  "published": "2025-05-20T18:30:55Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-37924"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/28c756738af44a404a91b77830d017bb0c525890"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b447463562238428503cfba1c913261047772f90"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e18c616718018dfc440e4a2d2b94e28fe91b1861"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e34a33d5d7e87399af0a138bb32f6a3e95dd83d2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e86e9134e1d1c90a960dd57f59ce574d27b9a124"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-37924 (GCVE-0-2025-37924)

Vulnerability from cvelistv5 – Published: 2025-05-20 15:21 – Updated: 2026-08-05 11:58

Title

ksmbd: fix use-after-free in kerberos authentication

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in kerberos authentication Setting sess->user = NULL was introduced to fix the dangling pointer created by ksmbd_free_user. However, it is possible another thread could be operating on the session and make use of sess->user after it has been passed to ksmbd_free_user but before sess->user is set to NULL.

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 mitre root Scorecard

References

6 references

URL	Tags
https://git.kernel.org/stable/c/e34a33d5d7e87399a…
https://git.kernel.org/stable/c/b4474635622384285…
https://git.kernel.org/stable/c/e18c616718018dfc4…
https://git.kernel.org/stable/c/28c756738af44a404…
https://git.kernel.org/stable/c/e86e9134e1d1c90a9…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < e34a33d5d7e87399af0a138bb32f6a3e95dd83d2 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < b447463562238428503cfba1c913261047772f90 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < e18c616718018dfc440e4a2d2b94e28fe91b1861 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 28c756738af44a404a91b77830d017bb0c525890 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < e86e9134e1d1c90a960dd57f59ce574d27b9a124 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 6.1.138 , ≤ 6.1.* (semver) Unaffected: 6.6.90 , ≤ 6.6.* (semver) Unaffected: 6.12.28 , ≤ 6.12.* (semver) Unaffected: 6.14.6 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T19:57:23.372Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/auth.c",
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "e34a33d5d7e87399af0a138bb32f6a3e95dd83d2",
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            },
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              "versionType": "git"
            },
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              "lessThan": "e18c616718018dfc440e4a2d2b94e28fe91b1861",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            },
            {
              "lessThan": "28c756738af44a404a91b77830d017bb0c525890",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            },
            {
              "lessThan": "e86e9134e1d1c90a960dd57f59ce574d27b9a124",
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              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
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          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/auth.c",
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.138",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.90",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.28",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "5.15",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.90",
                  "versionStartIncluding": "5.15",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in kerberos authentication\n\nSetting sess-\u003euser = NULL was introduced to fix the dangling pointer\ncreated by ksmbd_free_user. However, it is possible another thread could\nbe operating on the session and make use of sess-\u003euser after it has been\npassed to ksmbd_free_user but before sess-\u003euser is set to NULL."
        }
      ],
      "metrics": [
        {
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            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "ksmbd kerberos authentication UAF. sess-\u003euser freed by one thread while another thread still accesses it during concurrent session setup. Attacker opens two connections to same session and sends concurrent SESSION_SETUP requests, controlling both sides of the race. Network-reachable, pre-authentication."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:58:25.065Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e34a33d5d7e87399af0a138bb32f6a3e95dd83d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/b447463562238428503cfba1c913261047772f90"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/28c756738af44a404a91b77830d017bb0c525890"
        },
        {
          "url": "https://git.kernel.org/stable/c/e86e9134e1d1c90a960dd57f59ce574d27b9a124"
        }
      ],
      "title": "ksmbd: fix use-after-free in kerberos authentication",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37924",
    "datePublished": "2025-05-20T15:21:52.681Z",
    "dateReserved": "2025-04-16T04:51:23.969Z",
    "dateUpdated": "2026-08-05T11:58:25.065Z",
    "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.

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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GHSA-3X67-44WH-MRGF

CVE-2025-37924 (GCVE-0-2025-37924)

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Sightings

Nomenclature

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