CVE-2026-43172 (GCVE-0-2026-43172)
Vulnerability from cvelistv5
Published
2026-05-06 11:27
Modified
2026-08-05 12:26
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: fix 22000 series SMEM parsing If the firmware were to report three LMACs (which doesn't exist in hardware) then using "fwrt->smem_cfg.lmac[2]" is an overrun of the array. Reject such and use IWL_FW_CHECK instead of WARN_ON in this function.
References
Impacted products
Vendor Product Version
Linux Linux Version: ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424
Version: ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424
Version: ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/fw/smem.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1d49a42717bdc8de77eabeb5b7d3e88d141ffea9",
              "status": "affected",
              "version": "ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424",
              "versionType": "git"
            },
            {
              "lessThan": "2b4b1510aaaf5b9fb57327ecffc20c055f61f205",
              "status": "affected",
              "version": "ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424",
              "versionType": "git"
            },
            {
              "lessThan": "58192b9ce09b0f0f86e2036683bd542130b91a98",
              "status": "affected",
              "version": "ebfa7f8ae155c9a0bb2e4038d6b5d8b14881c424",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/fw/smem.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.16",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.6",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: fix 22000 series SMEM parsing\n\nIf the firmware were to report three LMACs (which doesn\u0027t\nexist in hardware) then using \"fwrt-\u003esmem_cfg.lmac[2]\" is\nan overrun of the array. Reject such and use IWL_FW_CHECK\ninstead of WARN_ON in this function."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - The vulnerable path is in the Wi-Fi device/firmware control path during iwlwifi start/restart when the host parses a firmware-supplied SHARED_MEM_CFG_CMD response, not a routed IP service. For the affected Wi-Fi subsystem, the highest reasonable external exposure is an adjacent wireless attacker able to drive malicious firmware/device behavior.\nAC:L - There is no race or complex state requirement once a malformed response is supplied. Setting lmac_num to 3 deterministically reaches the out-of-bounds write in the 22000-series parser.\nPR:N - The malformed firmware response is parsed by the kernel driver without OS credential checks and before any Wi-Fi peer authentication boundary matters. In the adjacent attacker model, no local account or kernel privilege is required.\nUI:N - The parser runs automatically during normal Wi-Fi device start or restart. Exploitation does not require a victim to open a file, mount anything, or perform a special action.\nS:U - The corruption affects host kernel iwlwifi driver state within the same kernel security authority. It does not inherently cross a VM, IOMMU, or separate authorization boundary.\nC:H - The bug is an attacker-controlled out-of-bounds write past fwrt-\u003esmem_cfg.lmac into adjacent iwl_fw_runtime state. Kernel memory corruption is reasonably leverageable for high confidentiality impact.\nI:H - Firmware-controlled 32-bit values are written beyond the two-element LMAC array into adjacent kernel driver fields. This is an out-of-bounds write with potential for arbitrary kernel state modification or control-flow influence.\nA:H - Even without full exploitation, corrupting adjacent iwlwifi runtime/debug/workqueue state can crash or destabilize the kernel. Kernel oops, panic, or persistent Wi-Fi driver failure constitutes high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:26:17.894Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1d49a42717bdc8de77eabeb5b7d3e88d141ffea9"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b4b1510aaaf5b9fb57327ecffc20c055f61f205"
        },
        {
          "url": "https://git.kernel.org/stable/c/58192b9ce09b0f0f86e2036683bd542130b91a98"
        }
      ],
      "title": "wifi: iwlwifi: fix 22000 series SMEM parsing",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43172",
    "datePublished": "2026-05-06T11:27:47.358Z",
    "dateReserved": "2026-05-01T14:12:55.991Z",
    "dateUpdated": "2026-08-05T12:26:17.894Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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