Vulnerability-Lookup

GHSA-JH47-C26G-FR5Q

Vulnerability from github – Published: 2024-11-19 03:31 – Updated: 2025-11-04 00:32

Details

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

ksmbd: fix slab-use-after-free in ksmbd_smb2_session_create

There is a race condition between ksmbd_smb2_session_create and ksmbd_expire_session. This patch add missing sessions_table_lock while adding/deleting session from global session table.

Severity

7.0 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2024-50286"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-11-19T02:16:30Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix slab-use-after-free in ksmbd_smb2_session_create\n\nThere is a race condition between ksmbd_smb2_session_create and\nksmbd_expire_session. This patch add missing sessions_table_lock\nwhile adding/deleting session from global session table.",
  "id": "GHSA-jh47-c26g-fr5q",
  "modified": "2025-11-04T00:32:03Z",
  "published": "2024-11-19T03:31:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50286"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0a77715db22611df50b178374c51e2ba0d58866e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e7a2ad2044377853cf8c59528dac808a08a99c72"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e923503a56b3385b64ae492e3225e4623f560c5b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f56446ba5378d19e31040b548a14ee9a8f1500ea"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-50286 (GCVE-0-2024-50286)

Vulnerability from cvelistv5 – Published: 2024-11-19 01:30 – Updated: 2026-08-05 11:43

Title

ksmbd: fix slab-use-after-free in ksmbd_smb2_session_create

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slab-use-after-free in ksmbd_smb2_session_create There is a race condition between ksmbd_smb2_session_create and ksmbd_expire_session. This patch add missing sessions_table_lock while adding/deleting session from global session table.

Severity

9.8 (Critical)


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

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-03-06 16:07 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/f56446ba5378d19e3…
https://git.kernel.org/stable/c/e923503a56b3385b6…
https://git.kernel.org/stable/c/e7a2ad2044377853c…
https://git.kernel.org/stable/c/0a77715db22611df5…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < f56446ba5378d19e31040b548a14ee9a8f1500ea (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < e923503a56b3385b64ae492e3225e4623f560c5b (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < e7a2ad2044377853cf8c59528dac808a08a99c72 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 0a77715db22611df50b178374c51e2ba0d58866e (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 6.1.117 , ≤ 6.1.* (semver) Unaffected: 6.6.61 , ≤ 6.6.* (semver) Unaffected: 6.11.8 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
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              "content": {
                "id": "CVE-2024-50286",
                "options": [
                  {
                    "Exploitation": "none"
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                  {
                    "Technical Impact": "total"
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                "role": "CISA Coordinator",
                "timestamp": "2025-03-06T16:07:56.848996Z",
                "version": "2.0.3"
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              "type": "ssvc"
            }
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          "dateUpdated": "2025-03-06T16:14:33.108Z",
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    "cna": {
      "affected": [
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          "product": "Linux",
          "programFiles": [
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              "status": "unaffected",
              "version": "6.11.8",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
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          ]
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      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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        }
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          "scenarios": [
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              "value": "AV:N - ksmbd is the in-kernel SMB server; the entire path is driven by SMB2 SESSION_SETUP packets arriving on TCP/445 from a remote peer. No local access is needed.\nAC:L - The attacker controls both sides of the race \u2014 one connection deterministically triggers ksmbd_expire_session()\u0027s unlocked hash_del()+kfree() via a second SessionId=0 SESSION_SETUP, while parallel connections drive hash_add()/__session_lookup() on the same 8-bucket global table, making bucket collisions near-certain.\nPR:N - smb2_check_user_session() explicitly exempts SMB2_SESSION_SETUP_HE from the conn-good/session-validity check, and ksmbd_smb2_session_create() plus ksmbd_session_register() run before any NTLMSSP/Kerberos credential is processed. An unauthenticated remote attacker reaches the bug.\nUI:N - Exploitation requires only that the attacker open TCP connections to the listening ksmbd port and send SESSION_SETUP requests; no action by any local user or administrator is involved.\nS:U - The corruption is confined to kernel slab memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The UAF lets __session_lookup()/ksmbd_session_lookup_slowpath() return a dangling struct ksmbd_session that is then used as work-\u003esess, exposing sess-\u003euser credentials, sess_key, smb3signingkey and smb3encryptionkey/decryptionkey read out of attacker-groomable freed memory.\nI:H - hlist_add_head() writes a kernel pointer (first-\u003epprev = \u0026n-\u003enext) into the freed, sprayable slab object, and __session_lookup() writes sess-\u003elast_active into freed memory \u2014 a write primitive usable for heap grooming and control-flow hijack.\nA:H - Corrupting the global session hlist and using a freed session reliably produces a slab-use-after-free oops or panic, remotely and repeatably without authentication."
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    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}

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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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