Vulnerability-Lookup

GHSA-XP33-MGVV-9242

Vulnerability from github – Published: 2025-11-13 00:30 – Updated: 2026-07-30 06:32

Details

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

net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce()

If new_asoc->peer.adaptation_ind=0 and sctp_ulpevent_make_authkey=0 and sctp_ulpevent_make_authkey() returns 0, then the variable ai_ev remains zero and the zero will be dereferenced in the sctp_ulpevent_free() function.

Severity

7.5 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-40187"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-11-12T22:15:45Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce()\n\nIf new_asoc-\u003epeer.adaptation_ind=0 and sctp_ulpevent_make_authkey=0\nand sctp_ulpevent_make_authkey() returns 0, then the variable\nai_ev remains zero and the zero will be dereferenced\nin the sctp_ulpevent_free() function.",
  "id": "GHSA-xp33-mgvv-9242",
  "modified": "2026-07-30T06:32:17Z",
  "published": "2025-11-13T00:30:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40187"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/025419f4e216a3ae0d0cec622262e98e8078c447"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1014b83778c8677f1d7a57c26dc728baa801ac62"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f3119686ef50319490ccaec81a575973da98815"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f702f85df0266ed7b5bab81ba50394c92f3c928"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/badbd79313e6591616c1b78e29a9b71efed7f035"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c21f45cfa4a9526b34d76b397c9ef080668b6e73"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d0e8f1445c19b1786759ba72a38267e1449bab7e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dbceedc0213e75bf3e9f9f9e2f66b10699d004fe"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2025-40187 (GCVE-0-2025-40187)

Vulnerability from cvelistv5 – Published: 2025-11-12 21:56 – Updated: 2026-08-05 12:08

Title

net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce()

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce() If new_asoc->peer.adaptation_ind=0 and sctp_ulpevent_make_authkey=0 and sctp_ulpevent_make_authkey() returns 0, then the variable ai_ev remains zero and the zero will be dereferenced in the sctp_ulpevent_free() function.

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 mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/1014b83778c8677f1…
https://git.kernel.org/stable/c/7f702f85df0266ed7…
https://git.kernel.org/stable/c/dbceedc0213e75bf3…
https://git.kernel.org/stable/c/025419f4e216a3ae0…
https://git.kernel.org/stable/c/c21f45cfa4a9526b3…
https://git.kernel.org/stable/c/d0e8f1445c19b1786…
https://git.kernel.org/stable/c/badbd79313e659161…
https://git.kernel.org/stable/c/2f3119686ef503194…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b , < 1014b83778c8677f1d7a57c26dc728baa801ac62 (git) Affected: 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b , < 7f702f85df0266ed7b5bab81ba50394c92f3c928 (git) Affected: 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b , < dbceedc0213e75bf3e9f9f9e2f66b10699d004fe (git) Affected: 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b , < 025419f4e216a3ae0d0cec622262e98e8078c447 (git) Affected: 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b , < c21f45cfa4a9526b34d76b397c9ef080668b6e73 (git) Affected: 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b , < d0e8f1445c19b1786759ba72a38267e1449bab7e (git) Affected: 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b , < badbd79313e6591616c1b78e29a9b71efed7f035 (git) Affected: 30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b , < 2f3119686ef50319490ccaec81a575973da98815 (git)
Linux	Linux	Affected: 4.17 Unaffected: 0 , < 4.17 (semver) Unaffected: 5.4.301 , ≤ 5.4.* (semver) Unaffected: 5.10.246 , ≤ 5.10.* (semver) Unaffected: 5.15.195 , ≤ 5.15.* (semver) Unaffected: 6.1.157 , ≤ 6.1.* (semver) Unaffected: 6.6.113 , ≤ 6.6.* (semver) Unaffected: 6.12.54 , ≤ 6.12.* (semver) Unaffected: 6.17.4 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/sm_statefuns.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1014b83778c8677f1d7a57c26dc728baa801ac62",
              "status": "affected",
              "version": "30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b",
              "versionType": "git"
            },
            {
              "lessThan": "7f702f85df0266ed7b5bab81ba50394c92f3c928",
              "status": "affected",
              "version": "30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b",
              "versionType": "git"
            },
            {
              "lessThan": "dbceedc0213e75bf3e9f9f9e2f66b10699d004fe",
              "status": "affected",
              "version": "30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b",
              "versionType": "git"
            },
            {
              "lessThan": "025419f4e216a3ae0d0cec622262e98e8078c447",
              "status": "affected",
              "version": "30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b",
              "versionType": "git"
            },
            {
              "lessThan": "c21f45cfa4a9526b34d76b397c9ef080668b6e73",
              "status": "affected",
              "version": "30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b",
              "versionType": "git"
            },
            {
              "lessThan": "d0e8f1445c19b1786759ba72a38267e1449bab7e",
              "status": "affected",
              "version": "30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b",
              "versionType": "git"
            },
            {
              "lessThan": "badbd79313e6591616c1b78e29a9b71efed7f035",
              "status": "affected",
              "version": "30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "30f6ebf65bc46161c5aaff1db2e6e7c76aa4a06b",
              "versionType": "git"
            }
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        {
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          "product": "Linux",
          "programFiles": [
            "net/sctp/sm_statefuns.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.17"
            },
            {
              "lessThan": "4.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.301",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.246",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.195",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.301",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.246",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.195",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.157",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.54",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.4",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce()\n\nIf new_asoc-\u003epeer.adaptation_ind=0 and sctp_ulpevent_make_authkey=0\nand sctp_ulpevent_make_authkey() returns 0, then the variable\nai_ev remains zero and the zero will be dereferenced\nin the sctp_ulpevent_free() function."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "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 - The bug is in the SCTP state machine\u0027s COOKIE ECHO handler, driven entirely by chunks received from a remote peer over IP, and is reached from `sctp_rcv()` in NET_RX softirq context. Any host with a listening SCTP socket (telecom SIGTRAN/M3UA/Diameter signalling nodes are routinely inter-carrier and internet facing) is remotely reachable.\nAC:L - The attacker deterministically controls both selectable preconditions by simply omitting the Adaptation Layer Indication parameter (leaving `ai_ev` NULL) and omitting the SCTP-AUTH parameters (forcing the `sctp_ulpevent_make_authkey()` call), which are the default characteristics of a plain handshake. The only remaining factor is the GFP_ATOMIC allocation failing, which the attacker can influence by flooding the target with concurrent association attempts and traffic to exhaust atomic reserves \u2014 particularly effective on the memory-constrained embedded/telecom devices where SCTP is deployed.\nPR:N - SCTP association establishment is entirely unauthenticated; the attacker only needs to complete the standard INIT / INIT-ACK / COOKIE ECHO exchange against a listening socket, with the state cookie having been minted by the victim itself. No credentials, capabilities, or local account are involved anywhere along the path.\nUI:N - Exploitation requires nothing from any local user or administrator beyond the pre-existing condition that an SCTP service is listening. The attacker drives the entire handshake unilaterally.\nS:U - The NULL dereference faults inside the kernel handling the same network stack that received the packet; there is no crossing into another security authority such as a hypervisor, IOMMU, or sandbox boundary.\nC:N - The dereference is a read of `event-\u003emsg_flags` at a fixed low offset from NULL, which faults immediately; no data is returned to the attacker and no kernel memory contents are disclosed.\nI:N - The bug is a read fault on a NULL pointer with no write, no out-of-bounds access, and no object lifetime confusion, so no kernel data is modified and no control-flow hijack primitive is produced.\nA:H - The dereference occurs in NET_RX softirq context, producing a fatal exception in interrupt \u2014 a kernel panic and complete loss of availability, or at minimum an oops that kills the softirq path (and an immediate panic on the `panic_on_oops` configurations common in embedded and telecom deployments). The attacker can repeat the attempt indefinitely across reboots."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:08:25.629Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1014b83778c8677f1d7a57c26dc728baa801ac62"
        },
        {
          "url": "https://git.kernel.org/stable/c/7f702f85df0266ed7b5bab81ba50394c92f3c928"
        },
        {
          "url": "https://git.kernel.org/stable/c/dbceedc0213e75bf3e9f9f9e2f66b10699d004fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/025419f4e216a3ae0d0cec622262e98e8078c447"
        },
        {
          "url": "https://git.kernel.org/stable/c/c21f45cfa4a9526b34d76b397c9ef080668b6e73"
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        {
          "url": "https://git.kernel.org/stable/c/d0e8f1445c19b1786759ba72a38267e1449bab7e"
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        {
          "url": "https://git.kernel.org/stable/c/badbd79313e6591616c1b78e29a9b71efed7f035"
        },
        {
          "url": "https://git.kernel.org/stable/c/2f3119686ef50319490ccaec81a575973da98815"
        }
      ],
      "title": "net/sctp: fix a null dereference in sctp_disposition sctp_sf_do_5_1D_ce()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40187",
    "datePublished": "2025-11-12T21:56:29.504Z",
    "dateReserved": "2025-04-16T07:20:57.177Z",
    "dateUpdated": "2026-08-05T12:08:25.629Z",
    "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.

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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GHSA-XP33-MGVV-9242

CVE-2025-40187 (GCVE-0-2025-40187)

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Sightings

Nomenclature

Related by attack behaviour