Vulnerability-Lookup

FKIE_CVE-2025-22037

Vulnerability from fkie_nvd - Published: 2025-04-16 15:15 - Updated: 2026-10-30 13:17

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix null pointer dereference in alloc_preauth_hash() The Client send malformed smb2 negotiate request. ksmbd return error response. Subsequently, the client can send smb2 session setup even thought conn->preauth_info is not allocated. This patch add KSMBD_SESS_NEED_SETUP status of connection to ignore session setup request if smb2 negotiate phase is not complete.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2d3461d6ae74ebdcd4d65128c855198649bcadcd
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8f216b33a5e1b3489c073b1ea1b3d7cb63c8dc4d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b8eb243e670ecf30e91524dd12f7260dac07d335	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c8b5b7c5da7d0c31c9b7190b4a7bba5281fc4780	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ca8bed31edf728a662ef9d6f39f50e7a7dc2b5ad	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cce57cd8c5dead24127cf2308fdd60fcad2d6ba6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://www.zerodayinitiative.com/advisories/ZDI-25-310/	Third Party Advisory

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/connection.h",
            "fs/smb/server/mgmt/user_session.c",
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          ],
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            },
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            "fs/smb/server/mgmt/user_session.c",
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.23",
              "versionType": "semver"
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              "status": "unaffected",
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix null pointer dereference in alloc_preauth_hash()\n\nThe Client send malformed smb2 negotiate request. ksmbd return error\nresponse. Subsequently, the client can send smb2 session setup even\nthought conn-\u003epreauth_info is not allocated.\nThis patch add KSMBD_SESS_NEED_SETUP status of connection to ignore\nsession setup request if smb2 negotiate phase is not complete."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: se corrige la desreferencia de puntero nulo en alloc_preauth_hash(). El cliente env\u00eda una solicitud de negociaci\u00f3n de SMB2 mal formada. ksmbd devuelve una respuesta de error. Posteriormente, el cliente puede enviar la configuraci\u00f3n de sesi\u00f3n de SMB2 incluso si conn-\u0026gt;preauth_info no est\u00e1 asignado. Este parche a\u00f1ade el estado de conexi\u00f3n KSMBD_SESS_NEED_SETUP para ignorar la solicitud de configuraci\u00f3n de sesi\u00f3n si la fase de negociaci\u00f3n de SMB2 no se completa."
    }
  ],
  "id": "CVE-2025-22037",
  "lastModified": "2026-10-30T13:17:55.693",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
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        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
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    },
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    },
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      "tags": [
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    }
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  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2025-22037 (GCVE-0-2025-22037)

Vulnerability from cvelistv5 – Published: 2025-04-16 14:11 – Updated: 2026-10-30 12:21

Title

ksmbd: fix null pointer dereference in alloc_preauth_hash()

Summary

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 CNA under the mitre root

CNA scorecard D 53/100 over 6846 records in the last 180 days details

References

7 references

URL	Tags
https://git.kernel.org/stable/c/2d3461d6ae74ebdcd…
https://git.kernel.org/stable/c/cce57cd8c5dead241…
https://git.kernel.org/stable/c/ca8bed31edf728a66…
https://git.kernel.org/stable/c/8f216b33a5e1b3489…
https://git.kernel.org/stable/c/b8eb243e670ecf30e…
https://git.kernel.org/stable/c/c8b5b7c5da7d0c31c…
https://www.zerodayinitiative.com/advisories/ZDI-…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 2d3461d6ae74ebdcd4d65128c855198649bcadcd (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < cce57cd8c5dead24127cf2308fdd60fcad2d6ba6 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < ca8bed31edf728a662ef9d6f39f50e7a7dc2b5ad (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 8f216b33a5e1b3489c073b1ea1b3d7cb63c8dc4d (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < b8eb243e670ecf30e91524dd12f7260dac07d335 (git) Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < c8b5b7c5da7d0c31c9b7190b4a7bba5281fc4780 (git)
Linux	Linux	Affected: 5.15 Unaffected: 0 , < 5.15 (semver) Unaffected: 6.1.191 , ≤ 6.1.* (semver) Unaffected: 6.6.107 , ≤ 6.6.* (semver) Unaffected: 6.12.23 , ≤ 6.12.* (semver) Unaffected: 6.13.11 , ≤ 6.13.* (semver) Unaffected: 6.14.2 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/connection.h",
            "fs/smb/server/mgmt/user_session.c",
            "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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              "versionType": "semver"
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix null pointer dereference in alloc_preauth_hash()\n\nThe Client send malformed smb2 negotiate request. ksmbd return error\nresponse. Subsequently, the client can send smb2 session setup even\nthought conn-\u003epreauth_info is not allocated.\nThis patch add KSMBD_SESS_NEED_SETUP status of connection to ignore\nsession setup request if smb2 negotiate phase is not complete."
        }
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      "metrics": [
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - ksmbd is the in-kernel SMB server processing attacker-supplied SMB2 NEGOTIATE and SESSION_SETUP PDUs from any remote client on TCP/445. The entire trigger sequence consists of network packets sent over a single TCP connection.\nAC:L - The attacker fully controls all three PDUs and the sequence is deterministic \u2014 a valid SMB 3.1.1 negotiate, a second negotiate with no preauth-integrity context, then a session setup \u2014 with no race, timing, or memory-layout dependency.\nPR:N - SMB2_SESSION_SETUP_HE is explicitly exempted from session validation in smb2_check_user_session(), and the crash occurs in generate_preauth_hash() before any credential is verified. No account or authentication on the SMB server is required.\nUI:N - The attacker drives the whole sequence by connecting to the listening ksmbd socket; no action by an administrator, local user, or SMB client is needed.\nS:U - The NULL dereference occurs in kernel context within the ksmbd connection handler and its impact is confined to the kernel\u0027s own security authority, with no crossing into a hypervisor, IOMMU, or sandbox boundary.\nC:N - The faulting access is a fixed read of offsetof(struct preauth_integrity_info, Preauth_HashValue) from a NULL pointer, which faults immediately; no data is copied out and no attacker-controlled offset exists to turn it into a disclosure primitive.\nI:N - The bug is a read-side NULL dereference in kmemdup() with no out-of-bounds or freed-object write, so no kernel memory or control-flow state can be modified.\nA:H - An unauthenticated remote client reliably triggers a kernel oops in the ksmbd worker while conn-\u003esrv_mutex is held and conn-\u003er_count is outstanding, leaving the connection permanently stuck and the server unable to reclaim it; on kernels with panic_on_oops this is an immediate full system panic."
            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:21:08.185Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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        },
        {
          "url": "https://www.zerodayinitiative.com/advisories/ZDI-25-310/"
        }
      ],
      "title": "ksmbd: fix null pointer dereference in alloc_preauth_hash()",
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-22037",
    "datePublished": "2025-04-16T14:11:55.670Z",
    "dateReserved": "2024-12-29T08:45:45.809Z",
    "dateUpdated": "2026-10-30T12:21:08.185Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

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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.
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.

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