CVE-2021-47347 (GCVE-0-2021-47347)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-08-05 08:47
VLAI
Title
wl1251: Fix possible buffer overflow in wl1251_cmd_scan
Summary
In the Linux kernel, the following vulnerability has been resolved: wl1251: Fix possible buffer overflow in wl1251_cmd_scan Function wl1251_cmd_scan calls memcpy without checking the length. Harden by checking the length is within the maximum allowed size.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/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 2024-11-13 22:00 UTC
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 , < 57ad99ae3c6738ba87bad259bb57c641ca68ebf6 (git)
Affected: 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 , < d3d8b9c9c7843dce31e284927d4c9904fd5a510a (git)
Affected: 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 , < 0f6c0488368c9ac1aa685821916fadba32f5d1ef (git)
Affected: 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 , < 115103f6e3f1c26c473766c16439c7c8b235529a (git)
Affected: 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 , < d71dddeb5380613f9ef199f3e7368fd78fb1a46e (git)
Affected: 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 , < c5e4a10d7bd5d4f419d8b9705dff60cf69b302a1 (git)
Affected: 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 , < 302e2ee34c5f7c5d805b7f835d9a6f2b43474e2a (git)
Affected: 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 , < 40af3960a15339e8bbd3be50c3bc7b35e1a0b6ea (git)
Affected: 2f01a1f58889fbfeb68b1bc1b52e4197f3333490 , < d10a87a3535cce2b890897914f5d0d83df669c63 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.31
Unaffected: 0 , < 2.6.31 (semver)
Unaffected: 4.4.276 , ≤ 4.4.* (semver)
Unaffected: 4.9.276 , ≤ 4.9.* (semver)
Unaffected: 4.14.240 , ≤ 4.14.* (semver)
Unaffected: 4.19.198 , ≤ 4.19.* (semver)
Unaffected: 5.4.133 , ≤ 5.4.* (semver)
Unaffected: 5.10.51 , ≤ 5.10.* (semver)
Unaffected: 5.12.18 , ≤ 5.12.* (semver)
Unaffected: 5.13.3 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
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                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-11-13T22:00:32.437065Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-120",
                    "description": "CWE-120 Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-05-28T18:30:51.517Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/wireless/ti/wl1251/cmd.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "57ad99ae3c6738ba87bad259bb57c641ca68ebf6",
                  "status": "affected",
                  "version": "2f01a1f58889fbfeb68b1bc1b52e4197f3333490",
                  "versionType": "git"
                },
                {
                  "lessThan": "d3d8b9c9c7843dce31e284927d4c9904fd5a510a",
                  "status": "affected",
                  "version": "2f01a1f58889fbfeb68b1bc1b52e4197f3333490",
                  "versionType": "git"
                },
                {
                  "lessThan": "0f6c0488368c9ac1aa685821916fadba32f5d1ef",
                  "status": "affected",
                  "version": "2f01a1f58889fbfeb68b1bc1b52e4197f3333490",
                  "versionType": "git"
                },
                {
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                  "status": "affected",
                  "version": "2f01a1f58889fbfeb68b1bc1b52e4197f3333490",
                  "versionType": "git"
                },
                {
                  "lessThan": "d71dddeb5380613f9ef199f3e7368fd78fb1a46e",
                  "status": "affected",
                  "version": "2f01a1f58889fbfeb68b1bc1b52e4197f3333490",
                  "versionType": "git"
                },
                {
                  "lessThan": "c5e4a10d7bd5d4f419d8b9705dff60cf69b302a1",
                  "status": "affected",
                  "version": "2f01a1f58889fbfeb68b1bc1b52e4197f3333490",
                  "versionType": "git"
                },
                {
                  "lessThan": "302e2ee34c5f7c5d805b7f835d9a6f2b43474e2a",
                  "status": "affected",
                  "version": "2f01a1f58889fbfeb68b1bc1b52e4197f3333490",
                  "versionType": "git"
                },
                {
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                  "status": "affected",
                  "version": "2f01a1f58889fbfeb68b1bc1b52e4197f3333490",
                  "versionType": "git"
                },
                {
                  "lessThan": "d10a87a3535cce2b890897914f5d0d83df669c63",
                  "status": "affected",
                  "version": "2f01a1f58889fbfeb68b1bc1b52e4197f3333490",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/net/wireless/ti/wl1251/cmd.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "2.6.31"
                },
                {
                  "lessThan": "2.6.31",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.4.*",
                  "status": "unaffected",
                  "version": "4.4.276",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.9.*",
                  "status": "unaffected",
                  "version": "4.9.276",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.14.*",
                  "status": "unaffected",
                  "version": "4.14.240",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "4.19.*",
                  "status": "unaffected",
                  "version": "4.19.198",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.4.*",
                  "status": "unaffected",
                  "version": "5.4.133",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.51",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.12.*",
                  "status": "unaffected",
                  "version": "5.12.18",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.13.*",
                  "status": "unaffected",
                  "version": "5.13.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.14",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.4.276",
                      "versionStartIncluding": "2.6.31",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.9.276",
                      "versionStartIncluding": "2.6.31",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.14.240",
                      "versionStartIncluding": "2.6.31",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "4.19.198",
                      "versionStartIncluding": "2.6.31",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.133",
                      "versionStartIncluding": "2.6.31",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.51",
                      "versionStartIncluding": "2.6.31",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.12.18",
                      "versionStartIncluding": "2.6.31",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.13.3",
                      "versionStartIncluding": "2.6.31",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.14",
                      "versionStartIncluding": "2.6.31",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwl1251: Fix possible buffer overflow in wl1251_cmd_scan\n\nFunction wl1251_cmd_scan calls memcpy without checking the length.\nHarden by checking the length is within the maximum allowed size."
            }
          ],
          "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 overflow is reached only when a local process supplies an SSID via nl80211 NL80211_CMD_TRIGGER_SCAN or WEXT SIOCSIWSCAN into wl1251_op_hw_scan\u2192wl1251_cmd_scan; the copied bytes are not taken from over-the-air frames, so this is Local rather than Adjacent.\nAC:L - Once an oversized ssid_len reaches wl1251_cmd_scan, the unbounded memcpy into ssid[32] is fully deterministic with no race or layout dependency; the driver performs no length check of its own, so attack complexity is Low.\nPR:L - NL80211_CMD_TRIGGER_SCAN uses GENL_UNS_ADMIN_PERM (CAP_NET_ADMIN in the wiphy netns), which per kernel CNA guidance is Low rather than High, and on typical wl1251 embedded/desktop deployments that capability is delegated to ordinary sessions via wpa_supplicant/NetworkManager.\nUI:N - The attacker issues the scan or connect-driven scan request themselves; no separate victim action such as opening a crafted file is required.\nS:U - Corruption is confined to the host kernel wl1251 command buffer and the same OS security authority; it is not a VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - An oversized ssid_len causes both an out-of-bounds write past ssid[32] and an out-of-bounds read from the source SSID buffer into adjacent kernel memory in the scan request, which per OOB/memory-corruption guidance is High confidentiality impact.\nI:H - The unchecked memcpy is an attacker-controlled out-of-bounds write past the 32-byte ssid field into adjacent cmd-\u003echannels[] (then submitted to firmware), and out-of-bounds writes are scored High integrity.\nA:H - Kernel memory corruption from the unbounded copy can oops/panic under hardened kernels, and corrupting the firmware scan command can wedge or crash the wl1251 path, so availability impact is High."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:47:22.692Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/57ad99ae3c6738ba87bad259bb57c641ca68ebf6"
            },
            {
              "url": "https://git.kernel.org/stable/c/d3d8b9c9c7843dce31e284927d4c9904fd5a510a"
            },
            {
              "url": "https://git.kernel.org/stable/c/0f6c0488368c9ac1aa685821916fadba32f5d1ef"
            },
            {
              "url": "https://git.kernel.org/stable/c/115103f6e3f1c26c473766c16439c7c8b235529a"
            },
            {
              "url": "https://git.kernel.org/stable/c/d71dddeb5380613f9ef199f3e7368fd78fb1a46e"
            },
            {
              "url": "https://git.kernel.org/stable/c/c5e4a10d7bd5d4f419d8b9705dff60cf69b302a1"
            },
            {
              "url": "https://git.kernel.org/stable/c/302e2ee34c5f7c5d805b7f835d9a6f2b43474e2a"
            },
            {
              "url": "https://git.kernel.org/stable/c/40af3960a15339e8bbd3be50c3bc7b35e1a0b6ea"
            },
            {
              "url": "https://git.kernel.org/stable/c/d10a87a3535cce2b890897914f5d0d83df669c63"
            }
          ],
          "title": "wl1251: Fix possible buffer overflow in wl1251_cmd_scan",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47347",
        "datePublished": "2024-05-21T14:35:52.947Z",
        "dateReserved": "2024-05-21T14:28:16.981Z",
        "dateUpdated": "2026-08-05T08:47:22.692Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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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.