Vulnerability-Lookup

FKIE_CVE-2024-53186

Vulnerability from fkie_nvd - Published: 2024-12-27 14:15 - Updated: 2026-08-04 11:22

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/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

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix use-after-free in SMB request handling A race condition exists between SMB request handling in `ksmbd_conn_handler_loop()` and the freeing of `ksmbd_conn` in the workqueue handler `handle_ksmbd_work()`. This leads to a UAF. - KASAN: slab-use-after-free Read in handle_ksmbd_work - KASAN: slab-use-after-free in rtlock_slowlock_locked This race condition arises as follows: - `ksmbd_conn_handler_loop()` waits for `conn->r_count` to reach zero: `wait_event(conn->r_count_q, atomic_read(&conn->r_count) == 0);` - Meanwhile, `handle_ksmbd_work()` decrements `conn->r_count` using `atomic_dec_return(&conn->r_count)`, and if it reaches zero, calls `ksmbd_conn_free()`, which frees `conn`. - However, after `handle_ksmbd_work()` decrements `conn->r_count`, it may still access `conn->r_count_q` in the following line: `waitqueue_active(&conn->r_count_q)` or `wake_up(&conn->r_count_q)` This results in a UAF, as `conn` has already been freed. The discovery of this UAF can be referenced in the following PR for syzkaller's support for SMB requests.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/96261adb998a3b513468b6ce17dbec76be5507d4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/9a8c5d89d327ff58e9b2517f8a6afb4181d32c6e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a96f9eb7add30ba0fafcfe7b7aca090978196800	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f20b77f7897e6aab9ce5527e6016ad2be5d70a33	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/server.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            },
            {
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              "versionType": "git"
            },
            {
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            },
            {
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            },
            {
              "lessThan": "6.6.64",
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              "version": "6.11.3",
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          "vendor": "Linux",
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            },
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              "status": "unaffected",
              "version": "0",
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "versionEndExcluding": "6.6.64",
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            },
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  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix use-after-free in SMB request handling\n\nA race condition exists between SMB request handling in\n`ksmbd_conn_handler_loop()` and the freeing of `ksmbd_conn` in the\nworkqueue handler `handle_ksmbd_work()`. This leads to a UAF.\n- KASAN: slab-use-after-free Read in handle_ksmbd_work\n- KASAN: slab-use-after-free in rtlock_slowlock_locked\n\nThis race condition arises as follows:\n- `ksmbd_conn_handler_loop()` waits for `conn-\u003er_count` to reach zero:\n  `wait_event(conn-\u003er_count_q, atomic_read(\u0026conn-\u003er_count) == 0);`\n- Meanwhile, `handle_ksmbd_work()` decrements `conn-\u003er_count` using\n  `atomic_dec_return(\u0026conn-\u003er_count)`, and if it reaches zero, calls\n  `ksmbd_conn_free()`, which frees `conn`.\n- However, after `handle_ksmbd_work()` decrements `conn-\u003er_count`,\n  it may still access `conn-\u003er_count_q` in the following line:\n  `waitqueue_active(\u0026conn-\u003er_count_q)` or `wake_up(\u0026conn-\u003er_count_q)`\n  This results in a UAF, as `conn` has already been freed.\n\nThe discovery of this UAF can be referenced in the following PR for\nsyzkaller\u0027s support for SMB requests."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: se corrige el problema de use-after-free en la gesti\u00f3n de solicitudes SMB Existe una condici\u00f3n de ejecuci\u00f3n entre la gesti\u00f3n de solicitudes SMB en `ksmbd_conn_handler_loop()` y la liberaci\u00f3n de `ksmbd_conn` en el controlador de cola de trabajo `handle_ksmbd_work()`. Esto conduce a una UAF. - KASAN: slab-use-after-free Leer en handle_ksmbd_work - KASAN: slab-use-after-free en rtlock_slowlock_locked Esta condici\u00f3n de ejecuci\u00f3n surge de la siguiente manera: - `ksmbd_conn_handler_loop()` espera a que `conn-\u0026gt;r_count` llegue a cero: `wait_event(conn-\u0026gt;r_count_q, atomic_read(\u0026amp;conn-\u0026gt;r_count) == 0);` - Mientras tanto, `handle_ksmbd_work()` decrementa `conn-\u0026gt;r_count` usando `atomic_dec_return(\u0026amp;conn-\u0026gt;r_count)`, y si llega a cero, llama a `ksmbd_conn_free()`, que libera a `conn`. - Sin embargo, despu\u00e9s de que `handle_ksmbd_work()` disminuya `conn-\u0026gt;r_count`, a\u00fan puede acceder a `conn-\u0026gt;r_count_q` en la siguiente l\u00ednea: `waitqueue_active(\u0026amp;conn-\u0026gt;r_count_q)` o `wake_up(\u0026amp;conn-\u0026gt;r_count_q)` Esto da como resultado un UAF, ya que `conn` ya se ha liberado. Se puede hacer referencia al descubrimiento de este UAF en la siguiente PR para el soporte de syzkaller para solicitudes SMB."
    }
  ],
  "id": "CVE-2024-53186",
  "lastModified": "2026-08-04T11:22:03.150",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
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        "source": "nvd@nist.gov",
        "type": "Primary"
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
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      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-53186",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
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          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-02-10T17:13:00.740506Z",
          "version": "2.0.3"
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  "published": "2024-12-27T14:15:26.083",
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          "value": "CWE-362"
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        }
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      "source": "nvd@nist.gov",
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        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}

CVE-2024-53186 (GCVE-0-2024-53186)

Vulnerability from cvelistv5 – Published: 2024-12-27 13:49 – Updated: 2026-08-05 11:44

Title

ksmbd: fix use-after-free in SMB request handling

Summary

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 2025-02-10 17:13 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6971 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/a96f9eb7add30ba0f…
https://git.kernel.org/stable/c/f20b77f7897e6aab9…
https://git.kernel.org/stable/c/96261adb998a3b513…
https://git.kernel.org/stable/c/9a8c5d89d327ff58e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 18f06bacc197d4ac9b518ad1c69999bc3d83e7aa , < a96f9eb7add30ba0fafcfe7b7aca090978196800 (git) Affected: e9dac92f4482a382e8c0fe1bc243da5fc3526b0c , < f20b77f7897e6aab9ce5527e6016ad2be5d70a33 (git) Affected: ee426bfb9d09b29987369b897fe9b6485ac2be27 , < 96261adb998a3b513468b6ce17dbec76be5507d4 (git) Affected: ee426bfb9d09b29987369b897fe9b6485ac2be27 , < 9a8c5d89d327ff58e9b2517f8a6afb4181d32c6e (git) Affected: 9fd3cde4628bcd3549ab95061f2bab74d2ed4f3b (git) Affected: 6.6.55 , < 6.6.64 (semver) Affected: 6.11.3 , < 6.11.11 (semver) Affected: 6.10.14 , < 6.11 (semver)
Linux	Linux	Affected: 6.12 Unaffected: 0 , < 6.12 (semver) Unaffected: 6.6.64 , ≤ 6.6.* (semver) Unaffected: 6.11.11 , ≤ 6.11.* (semver) Unaffected: 6.12.2 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "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"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-53186",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-02-10T17:13:00.740506Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
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              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-02-10T17:21:09.067Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
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          "product": "Linux",
          "programFiles": [
            "fs/smb/server/server.c"
          ],
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              "version": "6.12.2",
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            },
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              "version": "6.13",
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      "cpeApplicability": [
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.2",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.10.14",
                  "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 SMB request handling\n\nA race condition exists between SMB request handling in\n`ksmbd_conn_handler_loop()` and the freeing of `ksmbd_conn` in the\nworkqueue handler `handle_ksmbd_work()`. This leads to a UAF.\n- KASAN: slab-use-after-free Read in handle_ksmbd_work\n- KASAN: slab-use-after-free in rtlock_slowlock_locked\n\nThis race condition arises as follows:\n- `ksmbd_conn_handler_loop()` waits for `conn-\u003er_count` to reach zero:\n  `wait_event(conn-\u003er_count_q, atomic_read(\u0026conn-\u003er_count) == 0);`\n- Meanwhile, `handle_ksmbd_work()` decrements `conn-\u003er_count` using\n  `atomic_dec_return(\u0026conn-\u003er_count)`, and if it reaches zero, calls\n  `ksmbd_conn_free()`, which frees `conn`.\n- However, after `handle_ksmbd_work()` decrements `conn-\u003er_count`,\n  it may still access `conn-\u003er_count_q` in the following line:\n  `waitqueue_active(\u0026conn-\u003er_count_q)` or `wake_up(\u0026conn-\u003er_count_q)`\n  This results in a UAF, as `conn` has already been freed.\n\nThe discovery of this UAF can be referenced in the following PR for\nsyzkaller\u0027s support for SMB requests."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "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": "AV:N - ksmbd is the in-kernel SMB server listening on TCP/445; the vulnerable work-completion path is driven entirely by PDUs received from a remote peer and by remote connection teardown. No local access is needed.\nAC:L - The attacker controls both sides of the race \u2014 queuing SMB work items (raising conn-\u003er_count) and abruptly closing the TCP connection to drive ksmbd_conn_handler_loop into wait_event/free \u2014 and can retry indefinitely across many parallel connections; syzkaller reproduced it without targeting.\nPR:N - queue_ksmbd_work()/handle_ksmbd_work() run for every received PDU including the very first SMB2 NEGOTIATE, before session setup or any credential validation, so an unauthenticated remote attacker reaches the bug.\nUI:N - Exploitation requires only that the attacker open connections and send/close them; no action by any local user or administrator is involved.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed ksmbd_conn is a sprayable general-cache allocation, and the UAF read of conn-\u003er_count_q plus the list walk in wake_up() over reclaimed memory can be leveraged into kernel memory disclosure and, via the resulting control primitive, arbitrary read.\nI:H - wake_up() on the freed waitqueue writes to freed memory (spinlock acquisition and list_del in the wake function) and performs an indirect call through curr-\u003efunc taken from reclaimed, attacker-sprayable memory, giving a control-flow hijack / arbitrary write primitive.\nA:H - Even without successful exploitation, the use-after-free reliably produces slab corruption, KASAN splats, and kernel oops/panic in handle_ksmbd_work or the RT lock slowpath, and can be triggered repeatedly by an unauthenticated remote peer."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:44:29.475Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a96f9eb7add30ba0fafcfe7b7aca090978196800"
        },
        {
          "url": "https://git.kernel.org/stable/c/f20b77f7897e6aab9ce5527e6016ad2be5d70a33"
        },
        {
          "url": "https://git.kernel.org/stable/c/96261adb998a3b513468b6ce17dbec76be5507d4"
        },
        {
          "url": "https://git.kernel.org/stable/c/9a8c5d89d327ff58e9b2517f8a6afb4181d32c6e"
        }
      ],
      "title": "ksmbd: fix use-after-free in SMB request handling",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-53186",
    "datePublished": "2024-12-27T13:49:29.215Z",
    "dateReserved": "2024-11-19T17:17:25.012Z",
    "dateUpdated": "2026-08-05T11:44:29.475Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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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.
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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.

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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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