Vulnerability-Lookup

GHSA-4MF3-FRRH-JFQW

Vulnerability from github – Published: 2026-01-23 15:31 – Updated: 2026-01-23 15:31

Details

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

ksmbd: Fix refcount leak when invalid session is found on session lookup

When a session is found but its state is not SMB2_SESSION_VALID, It indicates that no valid session was found, but it is missing to decrement the reference count acquired by the session lookup, which results in a reference count leak. This patch fixes the issue by explicitly calling ksmbd_user_session_put to release the reference to the session.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-71150"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-23T15:16:05Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: Fix refcount leak when invalid session is found on session lookup\n\nWhen a session is found but its state is not SMB2_SESSION_VALID, It\nindicates that no valid session was found, but it is missing to decrement\nthe reference count acquired by the session lookup, which results in\na reference count leak. This patch fixes the issue by explicitly calling\nksmbd_user_session_put to release the reference to the session.",
  "id": "GHSA-4mf3-frrh-jfqw",
  "modified": "2026-01-23T15:31:35Z",
  "published": "2026-01-23T15:31:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71150"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/02e06785e85b4bd86ef3d23b7c8d87acc76773d5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0fb87b28cafae71e9c8248432cc3a6a1fd759efc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8cabcb4dd3dc85dd83a37d26efcc59a66a4074d7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cafb57f7bdd57abba87725eb4e82bbdca4959644"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e54fb2a4772545701766cba08aab20de5eace8cd"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-71150 (GCVE-0-2025-71150)

Vulnerability from cvelistv5 – Published: 2026-01-23 14:15 – Updated: 2026-01-26 06:52

Title

ksmbd: Fix refcount leak when invalid session is found on session lookup

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix refcount leak when invalid session is found on session lookup When a session is found but its state is not SMB2_SESSION_VALID, It indicates that no valid session was found, but it is missing to decrement the reference count acquired by the session lookup, which results in a reference count leak. This patch fixes the issue by explicitly calling ksmbd_user_session_put to release the reference to the session.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/0fb87b28cafae71e9…
	https://git.kernel.org/stable/c/e54fb2a4772545701…
	https://git.kernel.org/stable/c/02e06785e85b4bd86…
	https://git.kernel.org/stable/c/8cabcb4dd3dc85dd8…
	https://git.kernel.org/stable/c/cafb57f7bdd57abba…

Impacted products

Vendor

Product

Version

Linux

Affected: 37a0e2b362b3150317fb6e2139de67b1e29ae5ff , < 0fb87b28cafae71e9c8248432cc3a6a1fd759efc (git)
Affected: 450a844c045ff0895d41b05a1cbe8febd1acfcfd , < e54fb2a4772545701766cba08aab20de5eace8cd (git)
Affected: a39e31e22a535d47b14656a7d6a893c7f6cf758c , < 02e06785e85b4bd86ef3d23b7c8d87acc76773d5 (git)
Affected: b95629435b84b9ecc0c765995204a4d8a913ed52 , < 8cabcb4dd3dc85dd83a37d26efcc59a66a4074d7 (git)
Affected: b95629435b84b9ecc0c765995204a4d8a913ed52 , < cafb57f7bdd57abba87725eb4e82bbdca4959644 (git)
Affected: 2107ab40629aeabbec369cf34b8cf0f288c3eb1b (git)

Linux

Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.64 , ≤ 6.12.* (semver)
Unaffected: 6.18.3 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc2 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/mgmt/user_session.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "0fb87b28cafae71e9c8248432cc3a6a1fd759efc",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "02e06785e85b4bd86ef3d23b7c8d87acc76773d5",
              "status": "affected",
              "version": "a39e31e22a535d47b14656a7d6a893c7f6cf758c",
              "versionType": "git"
            },
            {
              "lessThan": "8cabcb4dd3dc85dd83a37d26efcc59a66a4074d7",
              "status": "affected",
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              "versionType": "git"
            },
            {
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2107ab40629aeabbec369cf34b8cf0f288c3eb1b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/mgmt/user_session.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.160",
                  "versionStartIncluding": "6.1.121",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                  "versionStartIncluding": "5.15.176",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: Fix refcount leak when invalid session is found on session lookup\n\nWhen a session is found but its state is not SMB2_SESSION_VALID, It\nindicates that no valid session was found, but it is missing to decrement\nthe reference count acquired by the session lookup, which results in\na reference count leak. This patch fixes the issue by explicitly calling\nksmbd_user_session_put to release the reference to the session."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-26T06:52:30.374Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0fb87b28cafae71e9c8248432cc3a6a1fd759efc"
        },
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          "url": "https://git.kernel.org/stable/c/e54fb2a4772545701766cba08aab20de5eace8cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/02e06785e85b4bd86ef3d23b7c8d87acc76773d5"
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        {
          "url": "https://git.kernel.org/stable/c/8cabcb4dd3dc85dd83a37d26efcc59a66a4074d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/cafb57f7bdd57abba87725eb4e82bbdca4959644"
        }
      ],
      "title": "ksmbd: Fix refcount leak when invalid session is found on session lookup",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-71150",
    "datePublished": "2026-01-23T14:15:16.898Z",
    "dateReserved": "2026-01-13T15:30:19.662Z",
    "dateUpdated": "2026-01-26T06:52:30.374Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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-4MF3-FRRH-JFQW

CVE-2025-71150 (GCVE-0-2025-71150)

Tags

Sightings

Nomenclature