Vulnerability-Lookup

GHSA-77H3-779X-V4X3

Vulnerability from github – Published: 2026-01-13 18:31 – Updated: 2026-01-13 18:31

Details

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

ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency

Under high concurrency, A tree-connection object (tcon) is freed on a disconnect path while another path still holds a reference and later executes *_put()/write on it.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-68817"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-13T16:16:03Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency\n\nUnder high concurrency, A tree-connection object (tcon) is freed on\na disconnect path while another path still holds a reference and later\nexecutes *_put()/write on it.",
  "id": "GHSA-77h3-779x-v4x3",
  "modified": "2026-01-13T18:31:04Z",
  "published": "2026-01-13T18:31:04Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68817"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/063cbbc6f595ea36ad146e1b7d2af820894beb21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21a3d01fc6db5129f81edb0ab7cb94fd758bcbea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b39a1833cc4a2755b02603eec3a71a85e9dff926"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d092de8a26c952379ded8e6b0bda31d89befac1a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d64977495e44855f2b28d8ce56107c963a7a50e4"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2025-68817 (GCVE-0-2025-68817)

Vulnerability from cvelistv5 – Published: 2026-01-13 15:29 – Updated: 2026-01-14 08:51

Title

ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency Under high concurrency, A tree-connection object (tcon) is freed on a disconnect path while another path still holds a reference and later executes *_put()/write on it.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/d092de8a26c952379…
	https://git.kernel.org/stable/c/d64977495e44855f2…
	https://git.kernel.org/stable/c/21a3d01fc6db5129f…
	https://git.kernel.org/stable/c/063cbbc6f595ea36a…
	https://git.kernel.org/stable/c/b39a1833cc4a2755b…

Impacted products

Vendor

Product

Version

Linux

Affected: 7b58ee8d0b91359554cf219cd4f33872ea2afd66 , < d092de8a26c952379ded8e6b0bda31d89befac1a (git)
Affected: 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e , < d64977495e44855f2b28d8ce56107c963a7a50e4 (git)
Affected: 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e , < 21a3d01fc6db5129f81edb0ab7cb94fd758bcbea (git)
Affected: 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e , < 063cbbc6f595ea36ad146e1b7d2af820894beb21 (git)
Affected: 33b235a6e6ebe0f05f3586a71e8d281d00f71e2e , < b39a1833cc4a2755b02603eec3a71a85e9dff926 (git)
Affected: dd45db4d9bbc8f122a9b4db5ce94ae29fcf03d3c (git)

Linux

Affected: 6.6
Unaffected: 0 , < 6.6 (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-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/mgmt/tree_connect.c",
            "fs/smb/server/mgmt/tree_connect.h",
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d092de8a26c952379ded8e6b0bda31d89befac1a",
              "status": "affected",
              "version": "7b58ee8d0b91359554cf219cd4f33872ea2afd66",
              "versionType": "git"
            },
            {
              "lessThan": "d64977495e44855f2b28d8ce56107c963a7a50e4",
              "status": "affected",
              "version": "33b235a6e6ebe0f05f3586a71e8d281d00f71e2e",
              "versionType": "git"
            },
            {
              "lessThan": "21a3d01fc6db5129f81edb0ab7cb94fd758bcbea",
              "status": "affected",
              "version": "33b235a6e6ebe0f05f3586a71e8d281d00f71e2e",
              "versionType": "git"
            },
            {
              "lessThan": "063cbbc6f595ea36ad146e1b7d2af820894beb21",
              "status": "affected",
              "version": "33b235a6e6ebe0f05f3586a71e8d281d00f71e2e",
              "versionType": "git"
            },
            {
              "lessThan": "b39a1833cc4a2755b02603eec3a71a85e9dff926",
              "status": "affected",
              "version": "33b235a6e6ebe0f05f3586a71e8d281d00f71e2e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "dd45db4d9bbc8f122a9b4db5ce94ae29fcf03d3c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/mgmt/tree_connect.c",
            "fs/smb/server/mgmt/tree_connect.h",
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "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-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.160",
                  "versionStartIncluding": "6.1.71",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.64",
                  "versionStartIncluding": "6.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.3",
                  "versionStartIncluding": "6.6",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                  "versionStartIncluding": "5.15.145",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency\n\nUnder high concurrency, A tree-connection object (tcon) is freed on\na disconnect path while another path still holds a reference and later\nexecutes *_put()/write on it."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-14T08:51:40.603Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d092de8a26c952379ded8e6b0bda31d89befac1a"
        },
        {
          "url": "https://git.kernel.org/stable/c/d64977495e44855f2b28d8ce56107c963a7a50e4"
        },
        {
          "url": "https://git.kernel.org/stable/c/21a3d01fc6db5129f81edb0ab7cb94fd758bcbea"
        },
        {
          "url": "https://git.kernel.org/stable/c/063cbbc6f595ea36ad146e1b7d2af820894beb21"
        },
        {
          "url": "https://git.kernel.org/stable/c/b39a1833cc4a2755b02603eec3a71a85e9dff926"
        }
      ],
      "title": "ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68817",
    "datePublished": "2026-01-13T15:29:21.210Z",
    "dateReserved": "2025-12-24T10:30:51.048Z",
    "dateUpdated": "2026-01-14T08:51:40.603Z",
    "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-77H3-779X-V4X3

CVE-2025-68817 (GCVE-0-2025-68817)

Tags

Sightings

Nomenclature