CVE-2026-64175

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However, iwl_mld_tx_from_txq() does not check this flag before\ndequeuing frames from mac80211 and pushing them to the transport layer.\n\nSince the firmware is dead, iwl_trans_tx() returns -EIO for each frame,\nwhich then gets freed immediately. Under high-throughput conditions\n(e.g., Tailscale UDP traffic or active SSH sessions), this creates a\ntight dequeue-send-fail-free loop that wastes CPU cycles and generates\nrapid skb allocation churn, leading to memory pressure from slab\nfragmentation.\n\nThe RX path already has this guard (iwl_mld_rx_mpdu checks\nin_hw_restart at rx.c:1906), and so does the TXQ allocation worker\n(iwl_mld_add_txqs_wk at tx.c:156). Add the same guard to\niwl_mld_tx_from_txq() to stop all TX during firmware restart.\n\nFrames left in mac80211's TXQs are naturally drained after restart\ncompletes, when queue reallocation triggers iwl_mld_tx_from_txq()\nvia iwl_mld_add_txq_list(), or when new upper-layer traffic invokes\nwake_tx_queue.\n\nTested on ASUS Zenbook 14 UX3405CA with Intel BE201 (Wi-Fi 7) on\nkernel 6.19.5 where the firmware crashes approximately every 10-15\nminutes under Tailscale traffic."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is reached when outbound traffic drives mac80211 TX during firmware restart; a remote attacker can sustain that by sending high-volume packets to the victim over the network, causing responses and continued TX without local access.\nAC:L - An attacker can reliably generate sustained high-throughput traffic that both stresses the iwlwifi MLD firmware and keeps TX queues active during the restart window; on affected Intel Wi-Fi 7 hardware firmware crashes occur frequently under such load.\nPR:N - Exploitation requires only the ability to send network traffic to the victim; no local account, kernel capabilities, or authentication is needed to keep the TX dequeue loop running during firmware restart.\nUI:N - No victim interaction beyond normal network connectivity is required; the attacker can trigger the condition by flooding or sustaining traffic to the target.\nS:U - Impact is confined to kernel/driver resource exhaustion on the affected host and does not cross a security boundary such as VM escape or sandbox breakout.\nC:N - The flaw causes skb allocate/free churn and CPU waste but does not corrupt memory, leak kernel data, or provide an out-of-bounds or use-after-free read primitive.\nI:N - Failed transmits are dropped and freed cleanly; there is no arbitrary write, code execution, or integrity compromise beyond dropped packets during the restart window.\nA:H - The missing guard creates a tight dequeue-send-fail-free loop under high throughput during firmware restart, wasting CPU and causing memory pressure from slab fragmentation that can render the system effectively unavailable."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/intel/iwlwifi/mld/tx.c"], "versions": [{"version": "d1e879ec600f9b3bdd253167533959facfefb17b", "lessThan": "dc31c69476520bb4c2a208211a8d3c310a62c4d0", "status": "affected", "versionType": "git"}, {"version": "d1e879ec600f9b3bdd253167533959facfefb17b", "lessThan": "13f1786395dbbf3df73337063c798f1266be6151", "status": "affected", "versionType": "git"}, {"version": "d1e879ec600f9b3bdd253167533959facfefb17b", "lessThan": "2becb38a3e217ef2b2f42fddd7db7a25905ec291", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/intel/iwlwifi/mld/tx.c"], "versions": [{"version": "6.15", "status": "affected"}, {"version": "0", "lessThan": "6.15", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.34", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.11", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "6.18.34"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.0.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.15", "versionEndExcluding": "7.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/dc31c69476520bb4c2a208211a8d3c310a62c4d0"}, {"url": "https://git.kernel.org/stable/c/13f1786395dbbf3df73337063c798f1266be6151"}, {"url": "https://git.kernel.org/stable/c/2becb38a3e217ef2b2f42fddd7db7a25905ec291"}], "title": "wifi: iwlwifi: mld: stop TX during firmware restart", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64175", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:37:10.586674Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-400", "description": "CWE-400 Uncontrolled Resource Consumption"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T20:28:14.434Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-64175", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-16T15:37:10.586674Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:37:11.345Z"}}], "cna": {"title": "wifi: iwlwifi: mld: stop TX during firmware restart", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.5, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is reached when outbound traffic drives mac80211 TX during firmware restart; a remote attacker can sustain that by sending high-volume packets to the victim over the network, causing responses and continued TX without local access.\nAC:L - An attacker can reliably generate sustained high-throughput traffic that both stresses the iwlwifi MLD firmware and keeps TX queues active during the restart window; on affected Intel Wi-Fi 7 hardware firmware crashes occur frequently under such load.\nPR:N - Exploitation requires only the ability to send network traffic to the victim; no local account, kernel capabilities, or authentication is needed to keep the TX dequeue loop running during firmware restart.\nUI:N - No victim interaction beyond normal network connectivity is required; the attacker can trigger the condition by flooding or sustaining traffic to the target.\nS:U - Impact is confined to kernel/driver resource exhaustion on the affected host and does not cross a security boundary such as VM escape or sandbox breakout.\nC:N - The flaw causes skb allocate/free churn and CPU waste but does not corrupt memory, leak kernel data, or provide an out-of-bounds or use-after-free read primitive.\nI:N - Failed transmits are dropped and freed cleanly; there is no arbitrary write, code execution, or integrity compromise beyond dropped packets during the restart window.\nA:H - The missing guard creates a tight dequeue-send-fail-free loop under high throughput during firmware restart, wasting CPU and causing memory pressure from slab fragmentation that can render the system effectively unavailable."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "d1e879ec600f9b3bdd253167533959facfefb17b", "lessThan": "dc31c69476520bb4c2a208211a8d3c310a62c4d0", "versionType": "git"}, {"status": "affected", "version": "d1e879ec600f9b3bdd253167533959facfefb17b", "lessThan": "13f1786395dbbf3df73337063c798f1266be6151", "versionType": "git"}, {"status": "affected", "version": "d1e879ec600f9b3bdd253167533959facfefb17b", "lessThan": "2becb38a3e217ef2b2f42fddd7db7a25905ec291", "versionType": "git"}], "programFiles": ["drivers/net/wireless/intel/iwlwifi/mld/tx.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.15"}, {"status": "unaffected", "version": "0", "lessThan": "6.15", "versionType": "semver"}, {"status": "unaffected", "version": "6.18.34", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.0.11", "versionType": "semver", "lessThanOrEqual": "7.0.*"}, {"status": "unaffected", "version": "7.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/wireless/intel/iwlwifi/mld/tx.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/dc31c69476520bb4c2a208211a8d3c310a62c4d0"}, {"url": "https://git.kernel.org/stable/c/13f1786395dbbf3df73337063c798f1266be6151"}, {"url": "https://git.kernel.org/stable/c/2becb38a3e217ef2b2f42fddd7db7a25905ec291"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: iwlwifi: mld: stop TX during firmware restart\n\nWhen iwlwifi firmware crashes (e.g., NMI_INTERRUPT_UNKNOWN on Intel\nBE201/Wi-Fi 7), iwl_mld_nic_error() sets mld->fw_status.in_hw_restart\nto true. However, iwl_mld_tx_from_txq() does not check this flag before\ndequeuing frames from mac80211 and pushing them to the transport layer.\n\nSince the firmware is dead, iwl_trans_tx() returns -EIO for each frame,\nwhich then gets freed immediately. Under high-throughput conditions\n(e.g., Tailscale UDP traffic or active SSH sessions), this creates a\ntight dequeue-send-fail-free loop that wastes CPU cycles and generates\nrapid skb allocation churn, leading to memory pressure from slab\nfragmentation.\n\nThe RX path already has this guard (iwl_mld_rx_mpdu checks\nin_hw_restart at rx.c:1906), and so does the TXQ allocation worker\n(iwl_mld_add_txqs_wk at tx.c:156). Add the same guard to\niwl_mld_tx_from_txq() to stop all TX during firmware restart.\n\nFrames left in mac80211's TXQs are naturally drained after restart\ncompletes, when queue reallocation triggers iwl_mld_tx_from_txq()\nvia iwl_mld_add_txq_list(), or when new upper-layer traffic invokes\nwake_tx_queue.\n\nTested on ASUS Zenbook 14 UX3405CA with Intel BE201 (Wi-Fi 7) on\nkernel 6.19.5 where the firmware crashes approximately every 10-15\nminutes under Tailscale traffic."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.34", "versionStartIncluding": "6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.0.11", "versionStartIncluding": "6.15"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1", "versionStartIncluding": "6.15"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:39:53.411Z"}}}, "cveMetadata": {"cveId": "CVE-2026-64175", "state": "PUBLISHED", "dateUpdated": "2026-10-16T15:42:25.314Z", "dateReserved": "2026-07-19T07:54:57.039Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-07-19T15:41:00.157Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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However, iwl_mld_tx_from_txq() does not check this flag before\ndequeuing frames from mac80211 and pushing them to the transport layer.\n\nSince the firmware is dead, iwl_trans_tx() returns -EIO for each frame,\nwhich then gets freed immediately. Under high-throughput conditions\n(e.g., Tailscale UDP traffic or active SSH sessions), this creates a\ntight dequeue-send-fail-free loop that wastes CPU cycles and generates\nrapid skb allocation churn, leading to memory pressure from slab\nfragmentation.\n\nThe RX path already has this guard (iwl_mld_rx_mpdu checks\nin_hw_restart at rx.c:1906), and so does the TXQ allocation worker\n(iwl_mld_add_txqs_wk at tx.c:156). Add the same guard to\niwl_mld_tx_from_txq() to stop all TX during firmware restart.\n\nFrames left in mac80211's TXQs are naturally drained after restart\ncompletes, when queue reallocation triggers iwl_mld_tx_from_txq()\nvia iwl_mld_add_txq_list(), or when new upper-layer traffic invokes\nwake_tx_queue.\n\nTested on ASUS Zenbook 14 UX3405CA with Intel BE201 (Wi-Fi 7) on\nkernel 6.19.5 where the firmware crashes approximately every 10-15\nminutes under Tailscale traffic."}], "id": "CVE-2026-64175", "lastModified": "2026-10-19T21:17:26.043", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64175", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:37:10.586674Z", "version": "2.0.3"}}]}, "published": "2026-07-19T16:17:59.750", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/13f1786395dbbf3df73337063c798f1266be6151"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2becb38a3e217ef2b2f42fddd7db7a25905ec291"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/dc31c69476520bb4c2a208211a8d3c310a62c4d0"}], "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-400"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: wifi: iwlwifi: mld: stop TX during firmware restart", "id": "2502596", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502596"}, "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-835", "details": ["A flaw was found in the Linux kernel's iwlwifi driver. When the Wi-Fi firmware crashes, the driver continues to process network transmission requests inefficiently. This creates a continuous loop of attempting to send data through an unresponsive firmware, consuming excessive CPU resources and memory. This can lead to resource exhaustion and a denial of service (DoS) for the system."], "name": "CVE-2026-64175", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "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-2026-64175\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64175\nhttps://lore.kernel.org/linux-cve-announce/2026071937-CVE-2026-64175-d543@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d1e879ec600f9b3bdd253167533959facfefb17b,dc31c69476520bb4c2a208211a8d3c310a62c4d0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d1e879ec600f9b3bdd253167533959facfefb17b,13f1786395dbbf3df73337063c798f1266be6151)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d1e879ec600f9b3bdd253167533959facfefb17b,2becb38a3e217ef2b2f42fddd7db7a25905ec291)"}}], "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": "6.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.15)"}}, {"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": "2026-07-21T13:00:03.986082+00:00", "updated": "2026-10-20T04:15:09.094681+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-835", "CWE-400"]}