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

Vulnerability from cvelistv5 – Published: 2026-07-19 15:41 – Updated: 2026-08-05 12:39
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
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
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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{
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          "programFiles": [
            "drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c",
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          "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."
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              "value": "AV:A - The vulnerable TX rate path is reached when the iwlwifi driver transmits WiFi management frames (probe responses, auth/assoc) or beacon templates in response to over-the-air activity. A remote attacker on the same WiFi/BSS segment can trigger this by sending probe requests to a victim AP or operating a rogue AP that causes victim clients to exchange management frames.\nAC:L - Once the victim uses affected legacy Intel hardware (e.g. 7265D with v1 rate firmware), the attacker can reliably trigger the bug by sending standard 802.11 management frames; no special timing, memory layout, or race conditions beyond normal WiFi traffic are required.\nPR:N - An adjacent attacker needs no privileges on the victim system. Exploitation is triggered purely by WiFi frames received by the victim\u0027s wireless interface; no local account, CAP_NET_ADMIN, or ioctl/netlink access on the victim is required.\nUI:N - From the attacker\u0027s perspective, no action by the victim user is needed beyond the WiFi interface being active (e.g., an AP broadcasting beacons or a client performing normal association). Probe responses and association handshakes are sent automatically by the driver.\nS:U - The vulnerability is confined to the iwlwifi kernel driver and its firmware interaction on the victim host. Impact does not cross a security boundary such as VM escape, sandbox escape, or IOMMU bypass.\nC:H - The double PLCP conversion passes PLCP values (e.g. 55, 110 for CCK rates) as array indices to iwl_fw_rate_idx_to_plcp(), which performs an unchecked lookup into a ~17-element table, causing out-of-bounds kernel memory reads whose results are embedded into TX commands.\nI:N - The bug corrupts rate-encoding metadata sent to firmware but does not provide an arbitrary kernel write, use-after-free, or demonstrated control-flow hijack primitive. Impact is malformed TX parameters and firmware misbehavior, not integrity of arbitrary kernel or user data.\nA:H - The fix commit and prior bug report document firmware assert/crash from incorrect beacon/TX_CMD rates on old devices, and the RX path emits WARN_ON for invalid rate values reported back from firmware. This can disable WiFi connectivity and potentially cause repeated firmware restart loops."
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T13:33:49+00:00",
      "cve": "CVE-2026-64176",
      "id": "CVE-2026-64176",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "15",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: iwlwifi: mvm: fix driver-set TX rates on old devices",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64176.json",
      "version": "3"
    }
  }
}



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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.

Sightings

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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.