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

Vulnerability from cvelistv5 – Published: 2025-04-16 14:11 – Updated: 2026-05-11 21:11
VLAI
Title
ksmbd: fix null pointer dereference in alloc_preauth_hash()
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < cce57cd8c5dead24127cf2308fdd60fcad2d6ba6 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < ca8bed31edf728a662ef9d6f39f50e7a7dc2b5ad (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < 8f216b33a5e1b3489c073b1ea1b3d7cb63c8dc4d (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < b8eb243e670ecf30e91524dd12f7260dac07d335 (git)
Affected: 0626e6641f6b467447c81dd7678a69c66f7746cf , < c8b5b7c5da7d0c31c9b7190b4a7bba5281fc4780 (git)
Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (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)
Create a notification for this product.
Show details on NVD website
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": [
            {
              "lessThan": "cce57cd8c5dead24127cf2308fdd60fcad2d6ba6",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            },
            {
              "lessThan": "ca8bed31edf728a662ef9d6f39f50e7a7dc2b5ad",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            },
            {
              "lessThan": "8f216b33a5e1b3489c073b1ea1b3d7cb63c8dc4d",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            },
            {
              "lessThan": "b8eb243e670ecf30e91524dd12f7260dac07d335",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            },
            {
              "lessThan": "c8b5b7c5da7d0c31c9b7190b4a7bba5281fc4780",
              "status": "affected",
              "version": "0626e6641f6b467447c81dd7678a69c66f7746cf",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "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": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.107",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.23",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.13.*",
              "status": "unaffected",
              "version": "6.13.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.14.*",
              "status": "unaffected",
              "version": "6.14.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.107",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.23",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13.11",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.2",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:11:25.096Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cce57cd8c5dead24127cf2308fdd60fcad2d6ba6"
        },
        {
          "url": "https://git.kernel.org/stable/c/ca8bed31edf728a662ef9d6f39f50e7a7dc2b5ad"
        },
        {
          "url": "https://git.kernel.org/stable/c/8f216b33a5e1b3489c073b1ea1b3d7cb63c8dc4d"
        },
        {
          "url": "https://git.kernel.org/stable/c/b8eb243e670ecf30e91524dd12f7260dac07d335"
        },
        {
          "url": "https://git.kernel.org/stable/c/c8b5b7c5da7d0c31c9b7190b4a7bba5281fc4780"
        },
        {
          "url": "https://www.zerodayinitiative.com/advisories/ZDI-25-310/"
        }
      ],
      "title": "ksmbd: fix null pointer dereference in alloc_preauth_hash()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "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": "2026-05-11T21:11:25.096Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-22037",
      "date": "2026-06-07",
      "epss": "0.00109",
      "percentile": "0.288"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-22037\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-04-16T15:15:56.310\",\"lastModified\":\"2025-09-19T15:15:48.433\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"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.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"6.12.23\",\"matchCriteriaId\":\"17B5E5A5-D687-44D7-9EFF-19633C9746A3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.13.11\",\"matchCriteriaId\":\"E7E864B0-8C00-4679-BA55-659B4C9C3AD3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.14\",\"versionEndExcluding\":\"6.14.2\",\"matchCriteriaId\":\"FADAE5D8-4808-442C-B218-77B2CE8780A0\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/8f216b33a5e1b3489c073b1ea1b3d7cb63c8dc4d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b8eb243e670ecf30e91524dd12f7260dac07d335\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c8b5b7c5da7d0c31c9b7190b4a7bba5281fc4780\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ca8bed31edf728a662ef9d6f39f50e7a7dc2b5ad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cce57cd8c5dead24127cf2308fdd60fcad2d6ba6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://www.zerodayinitiative.com/advisories/ZDI-25-310/\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.