GHSA-M7PM-G64Q-7XF7
Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:32In 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.
{
"affected": [],
"aliases": [
"CVE-2026-64176"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-19T16:17:59Z",
"severity": "HIGH"
},
"details": "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.",
"id": "GHSA-m7pm-g64q-7xf7",
"modified": "2026-07-20T15:32:02Z",
"published": "2026-07-19T18:31:54Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64176"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6b58a79f2cd98156856eb49e8b55db5facdd7e6d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6fe92651b44fd3cfc8dcfdaad0e82885c384dada"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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