Vulnerability-Lookup

FKIE_CVE-2024-50086

Vulnerability from fkie_nvd - Published: 2024-10-29 01:15 - Updated: 2026-08-04 11:21

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 user-after-free from session log off There is racy issue between smb2 session log off and smb2 session setup. It will cause user-after-free from session log off. This add session_lock when setting SMB2_SESSION_EXPIRED and referece count to session struct not to free session while it is being used.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/0f62358ce85b2d4c949ef1b648be01b29cec667a
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/5511999e9615e4318e9142d23b29bd1597befc08	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/7aa8804c0b67b3cb263a472d17f2cb50d7f1a930	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a9839c37fd813b432988f58a9d9dd59253d3eb2c	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ee371898b53a9b9b51c02d22a8c31bfb86d45f0d	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	6.12
linux	linux_kernel	6.12
linux	linux_kernel	6.12

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/mgmt/user_session.c",
            "fs/smb/server/mgmt/user_session.h",
            "fs/smb/server/server.c",
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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          ]
        },
        {
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          "programFiles": [
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            "fs/smb/server/smb2pdu.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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              "version": "6.11.5",
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            },
            {
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              "status": "unaffected",
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            }
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        }
      ],
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    }
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  "cveTags": [],
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix user-after-free from session log off\n\nThere is racy issue between smb2 session log off and smb2 session setup.\nIt will cause user-after-free from session log off.\nThis add session_lock when setting SMB2_SESSION_EXPIRED and referece\ncount to session struct not to free session while it is being used."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: se corrige el problema de user-after-free del cierre de sesi\u00f3n. Hay un problema de velocidad entre el cierre de sesi\u00f3n de smb2 y la configuraci\u00f3n de la sesi\u00f3n de smb2. Esto provocar\u00e1 que el user-after-free cierre la sesi\u00f3n. Esto agrega session_lock al configurar SMB2_SESSION_EXPIRED y hace referencia a count en la estructura de sesi\u00f3n para no liberar la sesi\u00f3n mientras se est\u00e1 utilizando."
    }
  ],
  "id": "CVE-2024-50086",
  "lastModified": "2026-08-04T11:21:16.980",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
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          "baseScore": 9.8,
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          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
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          "timestamp": "2025-04-25T14:30:09.987767Z",
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  "published": "2024-10-29T01:15:05.487",
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    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0f62358ce85b2d4c949ef1b648be01b29cec667a"
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}

CVE-2024-50086 (GCVE-0-2024-50086)

Vulnerability from cvelistv5 – Published: 2024-10-29 00:50 – Updated: 2026-08-05 11:41

Title

ksmbd: fix user-after-free from session log off

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 2025-04-25 14:30 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/0f62358ce85b2d4c9…
https://git.kernel.org/stable/c/a9839c37fd813b432…
https://git.kernel.org/stable/c/5511999e9615e4318…
https://git.kernel.org/stable/c/ee371898b53a9b9b5…
https://git.kernel.org/stable/c/7aa8804c0b67b3cb2…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 0f62358ce85b2d4c949ef1b648be01b29cec667a (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < a9839c37fd813b432988f58a9d9dd59253d3eb2c (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 5511999e9615e4318e9142d23b29bd1597befc08 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < ee371898b53a9b9b51c02d22a8c31bfb86d45f0d (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 7aa8804c0b67b3cb263a472d17f2cb50d7f1a930 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 5.15.171 , ≤ 5.15.* (semver) Unaffected: 6.1.114 , ≤ 6.1.* (semver) Unaffected: 6.6.58 , ≤ 6.6.* (semver) Unaffected: 6.11.5 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (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"
            }
          },
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            "other": {
              "content": {
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                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2025-04-25T14:30:09.987767Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
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              {
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                "description": "CWE-416 Use After Free",
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              }
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        ],
        "providerMetadata": {
          "dateUpdated": "2025-04-25T14:36:34.763Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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        "providerMetadata": {
          "dateUpdated": "2025-11-03T22:25:18.791Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix user-after-free from session log off\n\nThere is racy issue between smb2 session log off and smb2 session setup.\nIt will cause user-after-free from session log off.\nThis add session_lock when setting SMB2_SESSION_EXPIRED and referece\ncount to session struct not to free session while it is being used."
        }
      ],
      "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 processing attacker-supplied SMB2 PDUs on TCP/445 (or RDMA), so the entire race is driven by remote network traffic. No local access to the target is required.\nAC:L - The attacker controls both sides of the race \u2014 one pipelined SMB2 request holds the raw `work-\u003esess` pointer while a second concurrently issued SMB2_SESSION_SETUP drives `ksmbd_expire_session()` into `kfree(sess)` \u2014 and each PDU is dispatched to a separate workqueue item, so the race can be replayed indefinitely and widened with compound/large requests.\nPR:N - No credentials are needed: `__session_create()` leaves a session `SMB2_SESSION_IN_PROGRESS` and `smb2_sess_setup()`\u0027s error path marks it `SMB2_SESSION_EXPIRED`, both of which `ksmbd_expire_session()` frees, while the concurrent work item still dereferences `work-\u003esess` in `smb3_preauth_hash_rsp()`/`set_sign_rsp()` after `ksmbd_conn_unlock()`. The logoff variant needs only an ordinary (including guest-mapped) SMB session.\nUI:N - The attacker triggers everything by sending SMB2 requests to the listening ksmbd server; no action by any local user or administrator is involved.\nS:U - The corruption and its consequences stay within the kernel\u0027s own security authority on the SMB server host, with no crossing of a VM, sandbox, or IOMMU boundary.\nC:H - After the free, `set_sign_rsp()` HMACs the response with `sess-\u003esmb3signingkey` read from reclaimed slab memory and returns the result to the attacker, and `sess-\u003efile_table`/`sess-\u003etree_conns` lookups on freed xarrays yield attacker-influenced pointers, enabling disclosure of arbitrary kernel memory.\nI:H - `smb3_preauth_hash_rsp()` writes a 64-byte SHA-512 result through the `Preauth_HashValue` pointer read out of the freed object, giving a controlled kernel write once the slab is sprayed; the freed `file_table`/`tree_conns`/`user` fields additionally allow type confusion and control-flow hijacking.\nA:H - Even without successful exploitation the use-after-free dereferences freed slab memory and corrupts the allocator, producing kernel oopses and panics that take down the SMB server host, and it can be retriggered at will."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:41:31.690Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0f62358ce85b2d4c949ef1b648be01b29cec667a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a9839c37fd813b432988f58a9d9dd59253d3eb2c"
        },
        {
          "url": "https://git.kernel.org/stable/c/5511999e9615e4318e9142d23b29bd1597befc08"
        },
        {
          "url": "https://git.kernel.org/stable/c/ee371898b53a9b9b51c02d22a8c31bfb86d45f0d"
        },
        {
          "url": "https://git.kernel.org/stable/c/7aa8804c0b67b3cb263a472d17f2cb50d7f1a930"
        }
      ],
      "title": "ksmbd: fix user-after-free from session log off",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50086",
    "datePublished": "2024-10-29T00:50:29.284Z",
    "dateReserved": "2024-10-21T19:36:19.942Z",
    "dateUpdated": "2026-08-05T11:41:31.690Z",
    "state": "PUBLISHED"
  },
  "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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.