CVE-2026-64176 (GCVE-0-2026-64176)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:41 – Updated: 2026-07-20 06:41
VLAI
Title
wifi: iwlwifi: mvm: fix driver-set TX rates on old devices
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: mvm: fix driver-set TX rates on old devices On old devices such as 7265D, rates are still encoded in version 1 format, which doesn't use the CCK/OFDM rate index (0-3/0-7) but rather their PLCP value (e.g. 10 for 1 Mbps CCK rate.) While introducing v3 rates, I changed the driver from internally handling v1 rates and converting to v2, to internally handling v3 and converting to v1 or v2 according to the firmware. I accordingly changed the code in iwl_mvm_mac80211_idx_to_hwrate() to no longer have different values for different APIs. This was correct. However, I later reverted this part of the change, because it was reported that I had broken beacon rates, causing a FW assert/crash. This caused TX_CMD rates to be set incorrectly, potentially causing a warning when reported back from the device as having been used. Fix this (hopefully correctly now) by handling beacon rates in the TX_CMD that's embedded in the beacon template command separately. Restore iwl_mvm_mac80211_idx_to_hwrate() to return only the rate index, not PLCP value, fixing the real TX_CMD.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 3592c0083fb29cca13cd9978b8844d58b4eff548 , < 6fe92651b44fd3cfc8dcfdaad0e82885c384dada (git)
Affected: 3592c0083fb29cca13cd9978b8844d58b4eff548 , < 6b58a79f2cd98156856eb49e8b55db5facdd7e6d (git)
Affected: 3592c0083fb29cca13cd9978b8844d58b4eff548 , < fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b (git)
Affected: c6c14c2b08e9c4c82e1ec39ef3e8b9ec845ac7fd (git)
Affected: 6.17.9 , < 6.18 (semver)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c",
            "drivers/net/wireless/intel/iwlwifi/mvm/utils.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            }
          ]
        },
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c",
            "drivers/net/wireless/intel/iwlwifi/mvm/utils.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.18"
            },
            {
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              "status": "unaffected",
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            {
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
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                  "versionStartIncluding": "6.17.9",
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              ],
              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mvm: fix driver-set TX rates on old devices\n\nOn old devices such as 7265D, rates are still encoded in version 1\nformat, which doesn\u0027t use the CCK/OFDM rate index (0-3/0-7) but\nrather their PLCP value (e.g. 10 for 1 Mbps CCK rate.)\n\nWhile introducing v3 rates, I changed the driver from internally\nhandling v1 rates and converting to v2, to internally handling v3\nand converting to v1 or v2 according to the firmware. I accordingly\nchanged the code in iwl_mvm_mac80211_idx_to_hwrate() to no longer\nhave different values for different APIs. This was correct.\n\nHowever, I later reverted this part of the change, because it was\nreported that I had broken beacon rates, causing a FW assert/crash.\nThis caused TX_CMD rates to be set incorrectly, potentially causing\na warning when reported back from the device as having been used.\n\nFix this (hopefully correctly now) by handling beacon rates in the\nTX_CMD that\u0027s embedded in the beacon template command separately.\nRestore iwl_mvm_mac80211_idx_to_hwrate() to return only the rate\nindex, not PLCP value, fixing the real TX_CMD."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-20T06:41:52.827Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6fe92651b44fd3cfc8dcfdaad0e82885c384dada"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b58a79f2cd98156856eb49e8b55db5facdd7e6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b"
        }
      ],
      "title": "wifi: iwlwifi: mvm: fix driver-set TX rates on old devices",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64176",
    "datePublished": "2026-07-19T15:41:00.830Z",
    "dateReserved": "2026-07-19T07:54:57.039Z",
    "dateUpdated": "2026-07-20T06:41:52.827Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64176",
      "date": "2026-07-20",
      "epss": "0.00155",
      "percentile": "0.05062"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64176\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T16:17:59.853\",\"lastModified\":\"2026-07-20T07:16:42.343\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwifi: iwlwifi: mvm: fix driver-set TX rates on old devices\\n\\nOn old devices such as 7265D, rates are still encoded in version 1\\nformat, which doesn\u0027t use the CCK/OFDM rate index (0-3/0-7) but\\nrather their PLCP value (e.g. 10 for 1 Mbps CCK rate.)\\n\\nWhile introducing v3 rates, I changed the driver from internally\\nhandling v1 rates and converting to v2, to internally handling v3\\nand converting to v1 or v2 according to the firmware. I accordingly\\nchanged the code in iwl_mvm_mac80211_idx_to_hwrate() to no longer\\nhave different values for different APIs. This was correct.\\n\\nHowever, I later reverted this part of the change, because it was\\nreported that I had broken beacon rates, causing a FW assert/crash.\\nThis caused TX_CMD rates to be set incorrectly, potentially causing\\na warning when reported back from the device as having been used.\\n\\nFix this (hopefully correctly now) by handling beacon rates in the\\nTX_CMD that\u0027s embedded in the beacon template command separately.\\nRestore iwl_mvm_mac80211_idx_to_hwrate() to return only the rate\\nindex, not PLCP value, fixing the real TX_CMD.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c\",\"drivers/net/wireless/intel/iwlwifi/mvm/utils.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3592c0083fb29cca13cd9978b8844d58b4eff548\",\"lessThan\":\"6fe92651b44fd3cfc8dcfdaad0e82885c384dada\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3592c0083fb29cca13cd9978b8844d58b4eff548\",\"lessThan\":\"6b58a79f2cd98156856eb49e8b55db5facdd7e6d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3592c0083fb29cca13cd9978b8844d58b4eff548\",\"lessThan\":\"fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c6c14c2b08e9c4c82e1ec39ef3e8b9ec845ac7fd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.17.9\",\"lessThan\":\"6.18\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c\",\"drivers/net/wireless/intel/iwlwifi/mvm/utils.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/6b58a79f2cd98156856eb49e8b55db5facdd7e6d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6fe92651b44fd3cfc8dcfdaad0e82885c384dada\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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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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