Vulnerability-Lookup

GHSA-782G-7R6X-6926

Vulnerability from github – Published: 2025-12-16 15:30 – Updated: 2026-07-30 06:32

Details

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

ksmbd: close accepted socket when per-IP limit rejects connection

When the per-IP connection limit is exceeded in ksmbd_kthread_fn(), the code sets ret = -EAGAIN and continues the accept loop without closing the just-accepted socket. That leaks one socket per rejected attempt from a single IP and enables a trivial remote DoS.

Release client_sk before continuing.

This bug was found with ZeroPath.

Severity

7.5 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-68246"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-16T15:15:53Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: close accepted socket when per-IP limit rejects connection\n\nWhen the per-IP connection limit is exceeded in ksmbd_kthread_fn(),\nthe code sets ret = -EAGAIN and continues the accept loop without\nclosing the just-accepted socket. That leaks one socket per rejected\nattempt from a single IP and enables a trivial remote DoS.\n\nRelease client_sk before continuing.\n\nThis bug was found with ZeroPath.",
  "id": "GHSA-782g-7r6x-6926",
  "modified": "2026-07-30T06:32:24Z",
  "published": "2025-12-16T15:30:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68246"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35521b5a7e8a184548125f4530552101236dcda1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4587a7826be1ae0190dba10ff70b46bb0e3bc7d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5746b2a0f5eb3d79667b3c51fe849bd62464220e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7a3c7154d5fc05956a8ad9e72ecf49e21555bfca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98a5fd31cbf72d46bf18e50b3ab0ce86d5f319a9"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-68246 (GCVE-0-2025-68246)

Vulnerability from cvelistv5 – Published: 2025-12-16 14:21 – Updated: 2026-08-05 12:10

Title

ksmbd: close accepted socket when per-IP limit rejects connection

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: close accepted socket when per-IP limit rejects connection When the per-IP connection limit is exceeded in ksmbd_kthread_fn(), the code sets ret = -EAGAIN and continues the accept loop without closing the just-accepted socket. That leaks one socket per rejected attempt from a single IP and enables a trivial remote DoS. Release client_sk before continuing. This bug was found with ZeroPath.

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

5 references

URL	Tags
https://git.kernel.org/stable/c/7a3c7154d5fc05956…
https://git.kernel.org/stable/c/5746b2a0f5eb3d796…
https://git.kernel.org/stable/c/4587a7826be1ae019…
https://git.kernel.org/stable/c/35521b5a7e8a18454…
https://git.kernel.org/stable/c/98a5fd31cbf72d46b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 7a3c7154d5fc05956a8ad9e72ecf49e21555bfca (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 5746b2a0f5eb3d79667b3c51fe849bd62464220e (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 4587a7826be1ae0190dba10ff70b46bb0e3bc7d3 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 35521b5a7e8a184548125f4530552101236dcda1 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 98a5fd31cbf72d46bf18e50b3ab0ce86d5f319a9 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 6.1.159 , ≤ 6.1.* (semver) Unaffected: 6.6.117 , ≤ 6.6.* (semver) Unaffected: 6.12.59 , ≤ 6.12.* (semver) Unaffected: 6.17.9 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/transport_tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7a3c7154d5fc05956a8ad9e72ecf49e21555bfca",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
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              "versionType": "git"
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        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/transport_tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
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            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.159",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.159",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: close accepted socket when per-IP limit rejects connection\n\nWhen the per-IP connection limit is exceeded in ksmbd_kthread_fn(),\nthe code sets ret = -EAGAIN and continues the accept loop without\nclosing the just-accepted socket. That leaks one socket per rejected\nattempt from a single IP and enables a trivial remote DoS.\n\nRelease client_sk before continuing.\n\nThis bug was found with ZeroPath."
        }
      ],
      "metrics": [
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            "baseSeverity": "HIGH",
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              "value": "AV:N - The flaw is reachable remotely through IPv4 or IPv6 TCP connections to the ksmbd listener, normally port 445.\nAC:L - A single attacker can hold the per-IP quota and repeatedly complete additional TCP handshakes, with no race or condition outside the attacker\u0027s control.\nPR:N - The socket is leaked immediately after accept and before SMB negotiation, authentication, or credential validation.\nUI:N - Exploitation requires only attacker-initiated TCP connections and no action by a victim user.\nS:U - The vulnerable code and affected kernel and service resources remain within the host\u0027s existing security authority.\nC:N - The bug loses a reference to an allocated socket but does not expose memory or provide an out-of-bounds read or use-after-free primitive.\nI:N - No memory corruption, arbitrary write, or unauthorized data modification occurs.\nA:H - Repeated connections cause an unbounded and effectively unreclaimable kernel socket and inode leak, enabling complete ksmbd denial of service and potentially host-wide memory exhaustion."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:10:26.942Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/98a5fd31cbf72d46bf18e50b3ab0ce86d5f319a9"
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      "title": "ksmbd: close accepted socket when per-IP limit rejects connection",
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  "cveMetadata": {
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    "cveId": "CVE-2025-68246",
    "datePublished": "2025-12-16T14:21:23.551Z",
    "dateReserved": "2025-12-16T13:41:40.264Z",
    "dateUpdated": "2026-08-05T12:10:26.942Z",
    "state": "PUBLISHED"
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  "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.

Detection rules are retrieved from Rulezet.

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-782G-7R6X-6926

CVE-2025-68246 (GCVE-0-2025-68246)

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Sightings

Nomenclature

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