CVE-2026-74554

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That is\nwrong: dp_peer->peer_id for an MLO peer always carries the\nATH12K_PEER_ML_ID_VALID bit (BIT(13)), so clear_bit() is invoked with\nindex >= 0x2000, which is far outside the bitmap of ATH12K_MAX_MLO_PEERS\n(256) bits and corrupts memory adjacent to ah->free_ml_peer_id_map. The\nintended bitmap entry also never gets cleared, so subsequent\nath12k_peer_ml_alloc() calls eventually run out of IDs.\n\nThe ID without the VALID bit is what ath12k_peer_ml_alloc() returned and\nis stored in ahsta->ml_peer_id. Use that instead.\n\nWhile there, also reset ahsta->ml_peer_id to ATH12K_MLO_PEER_ID_INVALID so\nthe bitmap and ahsta->ml_peer_id stay in sync.\n\nTested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3"}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - The bug is in ath12k WiFi 7 MLO peer cleanup during firmware crash recovery; an adjacent attacker associates as an MLO client (or runs a malicious MLO AP) over 802.11, creating dp_peers whose peer_id includes BIT(13), then firmware recovery invokes ath12k_mac_dp_peer_cleanup().\nAC:L - Once an MLO peer exists, recovery deterministically calls clear_bit() with index >=0x2000 on every cleanup; the attacker controls association and can repeatedly induce or wait for firmware crash/recovery (MHI RDDM) without depending on uncontrollable timing or layout.\nPR:N - Exploitation requires only wireless association and firmware recovery on a host running ath12k; the remote attacker needs no local account, shell access, or Linux capabilities on the victim system.\nUI:N - On an ath12k AP the vulnerable recovery path runs without any action by the device operator beyond normal AP operation; the attacker triggers the condition solely by wireless association and crash/recovery events.\nS:U - The out-of-bounds clear_bit corrupts kernel memory in ath12k_hw/dp_hw adjacent to free_ml_peer_id_map; impact stays within kernel/driver context and does not by itself cross VM, container, or IOMMU security boundaries.\nC:H - clear_bit() with peer_id>=0x2000 writes outside the 256-bit free_ml_peer_id_map into the adjacent dp_peers[] RCU pointer table, corrupting kernel pointers that can be dereferenced later for arbitrary kernel memory read primitives.\nI:H - The out-of-bounds atomic bit-clear is a kernel memory write that corrupts dp_peers[] entries used on datapath RX/TX, enabling control of freed/corrupted objects and potential arbitrary code execution, not merely a benign crash.\nA:H - Corrupted dp_peers pointers during recovery can cause kernel oops/panic on subsequent datapath use, and the bitmap slot is never freed so ath12k_peer_ml_alloc() exhausts MLO peer IDs, denying further MLO associations (DoS)."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/ath/ath12k/mac.c"], "versions": [{"version": "ee16dcf573d5e3283fda601dd4bca6bc52251017", "lessThan": "234b5cb81e6fcc1e3b31b13deff66130be55f36e", "status": "affected", "versionType": "git"}, {"version": "ee16dcf573d5e3283fda601dd4bca6bc52251017", "lessThan": "47abd2ca281531deee38a3b3770d885e270e9fc9", "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/ath/ath12k/mac.c"], "versions": [{"version": "7.0", "status": "affected"}, {"version": "0", "lessThan": "7.0", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "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": "7.0", "versionEndExcluding": "7.1.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "7.0", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/234b5cb81e6fcc1e3b31b13deff66130be55f36e"}, {"url": "https://git.kernel.org/stable/c/47abd2ca281531deee38a3b3770d885e270e9fc9"}], "title": "wifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74554", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:59:58.796220Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:55.415Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74554", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:59:58.796220Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:59:59.831Z"}}], "cna": {"title": "wifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 8.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:A - The bug is in ath12k WiFi 7 MLO peer cleanup during firmware crash recovery; an adjacent attacker associates as an MLO client (or runs a malicious MLO AP) over 802.11, creating dp_peers whose peer_id includes BIT(13), then firmware recovery invokes ath12k_mac_dp_peer_cleanup().\nAC:L - Once an MLO peer exists, recovery deterministically calls clear_bit() with index >=0x2000 on every cleanup; the attacker controls association and can repeatedly induce or wait for firmware crash/recovery (MHI RDDM) without depending on uncontrollable timing or layout.\nPR:N - Exploitation requires only wireless association and firmware recovery on a host running ath12k; the remote attacker needs no local account, shell access, or Linux capabilities on the victim system.\nUI:N - On an ath12k AP the vulnerable recovery path runs without any action by the device operator beyond normal AP operation; the attacker triggers the condition solely by wireless association and crash/recovery events.\nS:U - The out-of-bounds clear_bit corrupts kernel memory in ath12k_hw/dp_hw adjacent to free_ml_peer_id_map; impact stays within kernel/driver context and does not by itself cross VM, container, or IOMMU security boundaries.\nC:H - clear_bit() with peer_id>=0x2000 writes outside the 256-bit free_ml_peer_id_map into the adjacent dp_peers[] RCU pointer table, corrupting kernel pointers that can be dereferenced later for arbitrary kernel memory read primitives.\nI:H - The out-of-bounds atomic bit-clear is a kernel memory write that corrupts dp_peers[] entries used on datapath RX/TX, enabling control of freed/corrupted objects and potential arbitrary code execution, not merely a benign crash.\nA:H - Corrupted dp_peers pointers during recovery can cause kernel oops/panic on subsequent datapath use, and the bitmap slot is never freed so ath12k_peer_ml_alloc() exhausts MLO peer IDs, denying further MLO associations (DoS)."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "ee16dcf573d5e3283fda601dd4bca6bc52251017", "lessThan": "234b5cb81e6fcc1e3b31b13deff66130be55f36e", "versionType": "git"}, {"status": "affected", "version": "ee16dcf573d5e3283fda601dd4bca6bc52251017", "lessThan": "47abd2ca281531deee38a3b3770d885e270e9fc9", "versionType": "git"}], "programFiles": ["drivers/net/wireless/ath/ath12k/mac.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "7.0"}, {"status": "unaffected", "version": "0", "lessThan": "7.0", "versionType": "semver"}, {"status": "unaffected", "version": "7.1.8", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/wireless/ath/ath12k/mac.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/234b5cb81e6fcc1e3b31b13deff66130be55f36e"}, {"url": "https://git.kernel.org/stable/c/47abd2ca281531deee38a3b3770d885e270e9fc9"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()\n\nath12k_mac_dp_peer_cleanup() clears the ML peer ID slot on the\nfree_ml_peer_id_map bitmap by indexing it with dp_peer->peer_id. That is\nwrong: dp_peer->peer_id for an MLO peer always carries the\nATH12K_PEER_ML_ID_VALID bit (BIT(13)), so clear_bit() is invoked with\nindex >= 0x2000, which is far outside the bitmap of ATH12K_MAX_MLO_PEERS\n(256) bits and corrupts memory adjacent to ah->free_ml_peer_id_map. The\nintended bitmap entry also never gets cleared, so subsequent\nath12k_peer_ml_alloc() calls eventually run out of IDs.\n\nThe ID without the VALID bit is what ath12k_peer_ml_alloc() returned and\nis stored in ahsta->ml_peer_id. Use that instead.\n\nWhile there, also reset ahsta->ml_peer_id to ATH12K_MLO_PEER_ID_INVALID so\nthe bitmap and ahsta->ml_peer_id stay in sync.\n\nTested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.8", "versionStartIncluding": "7.0"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "7.0"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:48:37.563Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74554", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:05:55.415Z", "dateReserved": "2026-08-15T05:44:03.916Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T12:28:00.097Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/wireless/ath/ath12k/mac.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "234b5cb81e6fcc1e3b31b13deff66130be55f36e", "status": "affected", "version": "ee16dcf573d5e3283fda601dd4bca6bc52251017", "versionType": "git"}, {"lessThan": "47abd2ca281531deee38a3b3770d885e270e9fc9", "status": "affected", "version": "ee16dcf573d5e3283fda601dd4bca6bc52251017", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/wireless/ath/ath12k/mac.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "7.0"}, {"lessThan": "7.0", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()\n\nath12k_mac_dp_peer_cleanup() clears the ML peer ID slot on the\nfree_ml_peer_id_map bitmap by indexing it with dp_peer->peer_id. That is\nwrong: dp_peer->peer_id for an MLO peer always carries the\nATH12K_PEER_ML_ID_VALID bit (BIT(13)), so clear_bit() is invoked with\nindex >= 0x2000, which is far outside the bitmap of ATH12K_MAX_MLO_PEERS\n(256) bits and corrupts memory adjacent to ah->free_ml_peer_id_map. The\nintended bitmap entry also never gets cleared, so subsequent\nath12k_peer_ml_alloc() calls eventually run out of IDs.\n\nThe ID without the VALID bit is what ath12k_peer_ml_alloc() returned and\nis stored in ahsta->ml_peer_id. Use that instead.\n\nWhile there, also reset ahsta->ml_peer_id to ATH12K_MLO_PEER_ID_INVALID so\nthe bitmap and ahsta->ml_peer_id stay in sync.\n\nTested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3"}], "id": "CVE-2026-74554", "lastModified": "2026-10-16T20:17:37.183", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74554", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:59:58.796220Z", "version": "2.0.3"}}]}, "published": "2026-08-15T13:18:00.830", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/234b5cb81e6fcc1e3b31b13deff66130be55f36e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/47abd2ca281531deee38a3b3770d885e270e9fc9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: wifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()", "id": "2517020", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517020"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nwifi: ath12k: fix out-of-bounds clear_bit in ath12k_mac_dp_peer_cleanup()\nath12k_mac_dp_peer_cleanup() clears the ML peer ID slot on the\nfree_ml_peer_id_map bitmap by indexing it with dp_peer->peer_id. That is\nwrong: dp_peer->peer_id for an MLO peer always carries the\nATH12K_PEER_ML_ID_VALID bit (BIT(13)), so clear_bit() is invoked with\nindex >= 0x2000, which is far outside the bitmap of ATH12K_MAX_MLO_PEERS\n(256) bits and corrupts memory adjacent to ah->free_ml_peer_id_map. The\nintended bitmap entry also never gets cleared, so subsequent\nath12k_peer_ml_alloc() calls eventually run out of IDs.\nThe ID without the VALID bit is what ath12k_peer_ml_alloc() returned and\nis stored in ahsta->ml_peer_id. Use that instead.\nWhile there, also reset ahsta->ml_peer_id to ATH12K_MLO_PEER_ID_INVALID so\nthe bitmap and ahsta->ml_peer_id stay in sync.\nTested-on: WCN7850 hw2.0 PCI WLAN.HMT.1.1.c5-00302-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.115823.3", "A flaw was found in the Linux kernel's ath12k Wi-Fi driver. An out-of-bounds write vulnerability exists in the `ath12k_mac_dp_peer_cleanup()` function. This issue occurs due to incorrect indexing of a bitmap, leading to memory corruption adjacent to the bitmap. This could allow a malicious Wi-Fi peer to cause a denial of service or potentially achieve arbitrary code execution."], "name": "CVE-2026-74554", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74554\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74554\nhttps://lore.kernel.org/linux-cve-announce/2026081551-CVE-2026-74554-011f@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ee16dcf573d5e3283fda601dd4bca6bc52251017,234b5cb81e6fcc1e3b31b13deff66130be55f36e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[ee16dcf573d5e3283fda601dd4bca6bc52251017,47abd2ca281531deee38a3b3770d885e270e9fc9)"}}], "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": "semver", "value": "7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.8,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc6,*]"}}], "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": "2026-08-15T15:45:06.743971+00:00", "updated": "2026-08-21T19:30:05.184103+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-787"]}