{"id":"CVE-2026-64176","state":"PUBLISHED","title":"wifi: iwlwifi: mvm: fix driver-set TX rates on old devices","description":"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't 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's 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.","publishedAt":"2026-07-19T15:41:00.830Z","updatedAt":"2026-10-19T20:28:14.591Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3592c0083fb29cca13cd9978b8844d58b4eff548","status":"affected","lessThan":"6fe92651b44fd3cfc8dcfdaad0e82885c384dada","versionType":"git"},{"version":"3592c0083fb29cca13cd9978b8844d58b4eff548","status":"affected","lessThan":"6b58a79f2cd98156856eb49e8b55db5facdd7e6d","versionType":"git"},{"version":"3592c0083fb29cca13cd9978b8844d58b4eff548","status":"affected","lessThan":"fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b","versionType":"git"},{"version":"c6c14c2b08e9c4c82e1ec39ef3e8b9ec845ac7fd","status":"affected","versionType":"git"},{"version":"6.17.9","status":"affected","lessThan":"6.18","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c","drivers/net/wireless/intel/iwlwifi/mvm/utils.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c","drivers/net/wireless/intel/iwlwifi/mvm/utils.c"]}],"references":["https://git.kernel.org/stable/c/6fe92651b44fd3cfc8dcfdaad0e82885c384dada","https://git.kernel.org/stable/c/6b58a79f2cd98156856eb49e8b55db5facdd7e6d","https://git.kernel.org/stable/c/fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b"],"weaknesses":["CWE-682"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64176.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64176","state":"PUBLISHED","datePublished":"2026-07-19T15:41:00.830Z","dateUpdated":"2026-10-19T20:28:14.591Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.039Z"},"containers":{"cna":{"title":"wifi: iwlwifi: mvm: fix driver-set TX rates on old devices","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't 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's 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":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"3592c0083fb29cca13cd9978b8844d58b4eff548","status":"affected","lessThan":"6fe92651b44fd3cfc8dcfdaad0e82885c384dada","versionType":"git"},{"version":"3592c0083fb29cca13cd9978b8844d58b4eff548","status":"affected","lessThan":"6b58a79f2cd98156856eb49e8b55db5facdd7e6d","versionType":"git"},{"version":"3592c0083fb29cca13cd9978b8844d58b4eff548","status":"affected","lessThan":"fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b","versionType":"git"},{"version":"c6c14c2b08e9c4c82e1ec39ef3e8b9ec845ac7fd","status":"affected","versionType":"git"},{"version":"6.17.9","status":"affected","lessThan":"6.18","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c","drivers/net/wireless/intel/iwlwifi/mvm/utils.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.18","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.18","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c","drivers/net/wireless/intel/iwlwifi/mvm/utils.c"]}],"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"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","baseScore":8.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","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's wireless interface; no local account, CAP_NET_ADMIN, or ioctl/netlink access on the victim is required.\nUI:N - From the attacker's 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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:39:54.477Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18","versionEndExcluding":"7.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.17.9"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-64176","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-16T15:37:13.733939Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-682","lang":"en","type":"CWE","description":"CWE-682 Incorrect Calculation"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T20:28:14.591Z"}}]}}}