Vulnerability-Lookup

GSD-2021-47232

Vulnerability from gsd - Updated: 2024-04-11 05:05

Details

** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.

Aliases

CVE-2021-47232

JSON

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  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
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    "osvSchema": {
      "aliases": [
        "CVE-2021-47232"
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      "id": "GSD-2021-47232",
      "modified": "2024-04-11T05:05:09.652916Z",
      "schema_version": "1.4.0"
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  "namespaces": {
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      "CVE_data_meta": {
        "ASSIGNER": "cve@mitre.org",
        "ID": "CVE-2021-47232",
        "STATE": "RESERVED"
      },
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
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            "value": "** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided."
          }
        ]
      }
    }
  }
}

CVE-2021-47232 (GCVE-0-2021-47232)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:19 – Updated: 2026-08-05 08:46

Title

can: j1939: fix Use-after-Free, hold skb ref while in use

Summary

In the Linux kernel, the following vulnerability has been resolved: can: j1939: fix Use-after-Free, hold skb ref while in use This patch fixes a Use-after-Free found by the syzbot. The problem is that a skb is taken from the per-session skb queue, without incrementing the ref count. This leads to a Use-after-Free if the skb is taken concurrently from the session queue due to a CTS.

Severity

9.8 (Critical)


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

8.4 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/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 2024-05-28 19:03 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/22cba878abf646cd3…
https://git.kernel.org/stable/c/509ab6bfdd0c76dae…
https://git.kernel.org/stable/c/1071065eeb33d32b7…
https://git.kernel.org/stable/c/2030043e616cab40f…

Impacted products

12 products

Vendor	Product	Version
Linux	Linux	Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 22cba878abf646cd3a02ee7c8c2cef7afe66a256 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 509ab6bfdd0c76daebbad0f0af07da712116de22 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 1071065eeb33d32b7d98c2ce7591881ae7381705 (git) Affected: 9d71dd0c70099914fcd063135da3c580865e924c , < 2030043e616cab40f510299f09b636285e0a3678 (git)
Linux	Linux	Affected: 5.4 Unaffected: 0 , < 5.4 (semver) Unaffected: 5.4.128 , ≤ 5.4.* (semver) Unaffected: 5.10.46 , ≤ 5.10.* (semver) Unaffected: 5.12.13 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix)
linux	linux_kernel	Affected: 9d71dd0c7009 , < 22cba878abf6 (custom) cpe:2.3:o:linux:linux_kernel:-:::::::*
linux	linux_kernel	Affected: 9d71dd0c7009 , < 509ab6bfdd0c (custom) cpe:2.3:o:linux:linux_kernel:-:::::::*
linux	linux_kernel	Affected: 9d71dd0c7009 , < 1071065eeb33 (custom) cpe:2.3:o:linux:linux_kernel:-:::::::*
linux	linux_kernel	Affected: 9d71dd0c7009 , < 2030043e616c (custom) cpe:2.3:o:linux:linux_kernel:-:::::::*
linux	linux_kernel	Unaffected: 5.4.128 , < 5.5 (custom) cpe:2.3:o:linux:linux_kernel:-:::::::*
linux	linux_kernel	Unaffected: 5.10.46 , < 5.11 (custom) cpe:2.3:o:linux:linux_kernel:-:::::::*
linux	linux_kernel	Unaffected: 5.12.13 , < 5.13 (custom) cpe:2.3:o:linux:linux_kernel:-:::::::*
linux	linux_kernel	Unaffected: 5.13 cpe:2.3:o:linux:linux_kernel:-:::::::*
linux	linux_kernel	Unaffected: 0 , < 5.4 (custom) cpe:2.3:o:linux:linux_kernel:-:::::::*
linux	linux_kernel	Affected: 5.4 cpe:2.3:o:linux:linux_kernel:5.4:-::::::

Show details on NVD website

JSON

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          },
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        "metrics": [
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            "cvssV3_1": {
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              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 8.4,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
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                "options": [
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                  },
                  {
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                  },
                  {
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-05-28T19:03:26.982947Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-416",
                "description": "CWE-416 Use After Free",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-06T19:57:24.908Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:32:07.907Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        },
        "references": [
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            "tags": [
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          },
          {
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            "url": "https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22"
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            "url": "https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705"
          },
          {
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            ],
            "url": "https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "versions": [
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          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The UAF is reached via can_rcv \u2192 j1939_can_recv \u2192 j1939_tp_recv when processing peer TP.CM_CTS/DAT frames; an unauthenticated J1939/CAN peer drives the race, consistent with other packet-triggered j1939 scores (e.g. CVE-2024-56645).\nAC:L - The attacker controls CTS injection timing against an active TP session and can retry indefinitely; when both sides of the race are attacker-driven (local sockets/vcan or crafted bus traffic), success does not depend on conditions outside attacker influence.\nPR:N - J1939 receive processing has no authentication; a bus peer needs no credentials on the target, and the same path is also reachable from an unprivileged AF_CAN/CAN_J1939 socket with no capability checks on create/bind/send.\nUI:N - Frames are handled in softirq with no victim action required beyond a bound J1939 socket, which is the normal steady state on systems using this stack.\nS:U - The corrupted sk_buff and resulting privilege impact remain within the kernel\u0027s security authority; this is not a VM escape, IOMMU bypass, or sandbox boundary crossing.\nC:H - Use-after-free of the session skb enables heap grooming and arbitrary read of freed object contents (including via continued use of the dangling skb pointer in TX/RX data paths).\nI:H - The same UAF yields a reclaimable freed sk_buff that can be sprayed for arbitrary write and control-flow hijacking primitives in the kernel heap.\nA:H - Dereferencing the freed skb causes kernel oops/panic, and an unauthenticated peer can trigger the race repeatedly to deny service."
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        },
        {
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      "title": "can: j1939: fix Use-after-Free, hold skb ref while in use",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47232",
    "datePublished": "2024-05-21T14:19:35.084Z",
    "dateReserved": "2024-04-10T18:59:19.530Z",
    "dateUpdated": "2026-08-05T08:46:51.007Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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}

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.

Action not permitted

GSD-2021-47232

CVE-2021-47232 (GCVE-0-2021-47232)

Tags

Sightings

Nomenclature