wifi: iwlwifi: mvm: fix driver-set TX rates on old devices

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Summary

CVECVE-2026-64176
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:59 UTC
Updated2026-07-20 07:16:42 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3592c0083fb29cca13cd9978b8844d58b4eff548 6fe92651b44fd3cfc8dcfdaad0e82885c384dada git Not specified
CNA Linux Linux affected 3592c0083fb29cca13cd9978b8844d58b4eff548 6b58a79f2cd98156856eb49e8b55db5facdd7e6d git Not specified
CNA Linux Linux affected 3592c0083fb29cca13cd9978b8844d58b4eff548 fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b git Not specified
CNA Linux Linux affected c6c14c2b08e9c4c82e1ec39ef3e8b9ec845ac7fd git Not specified
CNA Linux Linux affected 6.17.9 6.18 semver Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6fe92651b44fd3cfc8dcfdaad0e82885c384dada 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6b58a79f2cd98156856eb49e8b55db5facdd7e6d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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