Vulnerability-Lookup

GSD-2021-47194

Vulnerability from gsd - Updated: 2024-04-03 05:03

Details

In the Linux kernel, the following vulnerability has been resolved: cfg80211: call cfg80211_stop_ap when switch from P2P_GO type If the userspace tools switch from NL80211_IFTYPE_P2P_GO to NL80211_IFTYPE_ADHOC via send_msg(NL80211_CMD_SET_INTERFACE), it does not call the cleanup cfg80211_stop_ap(), this leads to the initialization of in-use data. For example, this path re-init the sdata->assigned_chanctx_list while it is still an element of assigned_vifs list, and makes that linked list corrupt.

Aliases

CVE-2021-47194

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CVE-2021-47194 (GCVE-0-2021-47194)

Vulnerability from cvelistv5 – Published: 2024-04-10 18:56 – Updated: 2026-08-05 08:46

Title

cfg80211: call cfg80211_stop_ap when switch from P2P_GO type

Summary

Severity

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: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-06-21 16:05 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6856 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/8f06bb8c216bcd172…
https://git.kernel.org/stable/c/0738cdb636c21ab55…
https://git.kernel.org/stable/c/4e458abbb4a523f14…
https://git.kernel.org/stable/c/b8a045e2a9b234cfb…
https://git.kernel.org/stable/c/52affc201fc22a1ab…
https://git.kernel.org/stable/c/7b97b5776daa0b39d…
https://git.kernel.org/stable/c/5a9b671c8d74a3e1b…
https://git.kernel.org/stable/c/563fbefed46ae4c1f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: ac800140c20e7ae51117e71289065bedd4930fc2 , < 8f06bb8c216bcd172394f61e557727e691b4cb24 (git) Affected: ac800140c20e7ae51117e71289065bedd4930fc2 , < 0738cdb636c21ab552eaecf905efa4a6070e3ebc (git) Affected: ac800140c20e7ae51117e71289065bedd4930fc2 , < 4e458abbb4a523f1413bfe15c079cf4e24c15b21 (git) Affected: ac800140c20e7ae51117e71289065bedd4930fc2 , < b8a045e2a9b234cfbc06cf36923886164358ddec (git) Affected: ac800140c20e7ae51117e71289065bedd4930fc2 , < 52affc201fc22a1ab9a59ef0ed641a9adfcb8d13 (git) Affected: ac800140c20e7ae51117e71289065bedd4930fc2 , < 7b97b5776daa0b39dbdadfea176f9cc0646d4a66 (git) Affected: ac800140c20e7ae51117e71289065bedd4930fc2 , < 5a9b671c8d74a3e1b999e7a0c7f366079bcc93dd (git) Affected: ac800140c20e7ae51117e71289065bedd4930fc2 , < 563fbefed46ae4c1f70cffb8eb54c02df480b2c2 (git)
Linux	Linux	Affected: 3.6 Unaffected: 0 , < 3.6 (semver) Unaffected: 4.4.293 , ≤ 4.4.* (semver) Unaffected: 4.9.291 , ≤ 4.9.* (semver) Unaffected: 4.14.256 , ≤ 4.14.* (semver) Unaffected: 4.19.218 , ≤ 4.19.* (semver) Unaffected: 5.4.162 , ≤ 5.4.* (semver) Unaffected: 5.10.82 , ≤ 5.10.* (semver) Unaffected: 5.15.5 , ≤ 5.15.* (semver) Unaffected: 5.16 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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            {
              "lessThanOrEqual": "4.4.*",
              "status": "unaffected",
              "version": "4.4.293",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.9.*",
              "status": "unaffected",
              "version": "4.9.291",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.256",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.218",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.162",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.82",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.4.293",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.9.291",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.256",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.218",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.162",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.82",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.5",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.16",
                  "versionStartIncluding": "3.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncfg80211: call cfg80211_stop_ap when switch from P2P_GO type\n\nIf the userspace tools switch from NL80211_IFTYPE_P2P_GO to\nNL80211_IFTYPE_ADHOC via send_msg(NL80211_CMD_SET_INTERFACE), it\ndoes not call the cleanup cfg80211_stop_ap(), this leads to the\ninitialization of in-use data. For example, this path re-init the\nsdata-\u003eassigned_chanctx_list while it is still an element of\nassigned_vifs list, and makes that linked list corrupt."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerability is triggered exclusively via local nl80211 Generic Netlink (NL80211_CMD_SET_INTERFACE \u2192 nl80211_set_interface \u2192 cfg80211_change_iface), not by processing over-the-air WiFi frames or remote network packets.\nAC:L - An attacker fully controls the sequence\u2014set the interface to P2P_GO, start AP (assigning the chanctx), then SET_INTERFACE to ADHOC\u2014and reliably causes INIT_LIST_HEAD on an still-linked assigned_chanctx_list with no attacker-independent race or external timing.\nPR:L - NL80211_CMD_SET_INTERFACE uses GENL_UNS_ADMIN_PERM, requiring only CAP_NET_ADMIN in the socket netns user namespace; with mac80211_hwsim (also GENL_UNS_ADMIN_PERM) or a wiphy in that netns this is reachable via unshare -Urn, so privileges score Low per CNA guidance.\nUI:N - The attacker issues the netlink commands themselves to change the interface type; no separate victim action such as mounting a filesystem or approving a prompt is required.\nS:U - Impact stays within the host kernel wireless/mac80211 authority (local list corruption / privilege-escalation class) and does not cross a VM, IOMMU, or other separate security boundary.\nC:H - INIT_LIST_HEAD on an in-use assigned_chanctx_list corrupts the chanctx assigned_vifs list, and subsequent walks dereference poisoned/reused pointers; this list-corruption class enables heap reuse and arbitrary kernel memory disclosure primitives.\nI:H - Corrupted list_head unlink/walk paths over attacker-influenced heap state yield classic arbitrary-write and control-flow hijack primitives, matching High integrity impact for kernel list corruption.\nA:H - Syzbot reproduces a general protection fault in ieee80211_chanctx_num_assigned when walking the corrupted assigned_vifs list, causing a kernel oops/panic and full denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:46:38.073Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8f06bb8c216bcd172394f61e557727e691b4cb24"
        },
        {
          "url": "https://git.kernel.org/stable/c/0738cdb636c21ab552eaecf905efa4a6070e3ebc"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e458abbb4a523f1413bfe15c079cf4e24c15b21"
        },
        {
          "url": "https://git.kernel.org/stable/c/b8a045e2a9b234cfbc06cf36923886164358ddec"
        },
        {
          "url": "https://git.kernel.org/stable/c/52affc201fc22a1ab9a59ef0ed641a9adfcb8d13"
        },
        {
          "url": "https://git.kernel.org/stable/c/7b97b5776daa0b39dbdadfea176f9cc0646d4a66"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a9b671c8d74a3e1b999e7a0c7f366079bcc93dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/563fbefed46ae4c1f70cffb8eb54c02df480b2c2"
        }
      ],
      "title": "cfg80211: call cfg80211_stop_ap when switch from P2P_GO type",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47194",
    "datePublished": "2024-04-10T18:56:31.361Z",
    "dateReserved": "2024-03-25T09:12:14.114Z",
    "dateUpdated": "2026-08-05T08:46:38.073Z",
    "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

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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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