CVE-2026-64176

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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."}], "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. 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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. 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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."}], "id": "CVE-2026-64176", "lastModified": "2026-10-19T21:17:26.193", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64176", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:37:13.733939Z", "version": "2.0.3"}}]}, "published": "2026-07-19T16:17:59.853", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6b58a79f2cd98156856eb49e8b55db5facdd7e6d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6fe92651b44fd3cfc8dcfdaad0e82885c384dada"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-682"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: wifi: iwlwifi: mvm: fix driver-set TX rates on old devices", "id": "2502575", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502575"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-617", "details": ["A flaw was found in the Linux kernel's iwlwifi driver, affecting older Intel wireless devices. This vulnerability arises from incorrect handling of transmit (TX) rates, specifically when the driver attempts to set these rates. An attacker could potentially trigger a firmware assert or crash, leading to a denial of service (DoS) for the affected wireless functionality."], "name": "CVE-2026-64176", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "impact": "important", "package_name": "erlang27", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64176\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64176\nhttps://lore.kernel.org/linux-cve-announce/2026071937-CVE-2026-64176-70c8@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3592c0083fb29cca13cd9978b8844d58b4eff548,6fe92651b44fd3cfc8dcfdaad0e82885c384dada)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3592c0083fb29cca13cd9978b8844d58b4eff548,6b58a79f2cd98156856eb49e8b55db5facdd7e6d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[3592c0083fb29cca13cd9978b8844d58b4eff548,fb84b5cbcaab3ca0f4e961d92a40ed7f3aac483b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "c6c14c2b08e9c4c82e1ec39ef3e8b9ec845ac7fd"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[6.17.9,6.18)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.34,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0.11,7.0.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-07-21T11:45:03.654568+00:00", "updated": "2026-10-20T04:15:09.093244+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-617", "CWE-682"]}