Linux Kernel iwlwifi TX_CMD Rate Error on Legacy Devices
CVE-2026-64176 Published on July 19, 2026
wifi: iwlwifi: mvm: fix driver-set TX rates on old devices
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.
Products Associated with CVE-2026-64176
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Affected Versions
Linux:- Version 3592c0083fb29cca13cd9978b8844d58b4eff548 and below 6fe92651b44fd3cfc8dcfdaad0e82885c384dada is affected.
- Version 3592c0083fb29cca13cd9978b8844d58b4eff548 and below 6b58a79f2cd98156856eb49e8b55db5facdd7e6d is affected.
- Version 3592c0083fb29cca13cd9978b8844d58b4eff548 and below fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b is affected.
- Version c6c14c2b08e9c4c82e1ec39ef3e8b9ec845ac7fd is affected.
- Version 6.17.9 and below 6.18 is affected.
- Version 6.18 is affected.
- Before 6.18 is unaffected.
- Version 6.18.34, <= 6.18.* is unaffected.
- Version 7.0.11, <= 7.0.* is unaffected.
- Version 7.1, <= * is unaffected.