CVE-2026-90408

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90408", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.812Z", "datePublished": "2026-09-17T16:09:36.089Z", "dateUpdated": "2026-10-21T12:51:31.378Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:51:31.378Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_count_event()\n\nThere is no policy entry for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT, so\nthe parse infrastructure does not enforce a minimum length for the event\nstruct. Additionally, the num_vdevs field is taken directly from firmware\nand used as a loop bound over the vdev_ids array without checking that it\nfits within the TLV payload. Either condition can cause an out-of-bounds\nread.\n\nAdd a TLV policy entry for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT so\nthe parse infrastructure enforces a minimum length for the fixed-size event\nstruct. Add a helper ath12k_wmi_tlv_data_len() to recover the payload\nlength of a parsed TLV from the header preceding its data pointer. Use it\nin ath12k_wmi_process_csa_switch_count_event() to bound num_vdevs before\nthe loop.\n\nCompile tested only."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.7, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - Firmware supplies the malformed bytes in WMI_PDEV_CSA_SWITCH_COUNT_STATUS_EVENTID (num_vdevs and the WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT TLV length) on CE2 \u2192 ath12k_ce_recv_process_cb \u2192 ath12k_htc_rx_completion_handler \u2192 ath12k_wmi_op_rx; 802.11 CSA IEs do not carry those fields, so this is the host-firmware HTC path, not an over-the-air frame parse.\nAC:L - Pre-fix ath12k_wmi_tlv_policies had no min_len for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT, and ath12k_wmi_process_csa_switch_count_event() used firmware le32 num_vdevs as the vdev_ids[] loop bound with no TLV-length check, so a short event TLV or oversized num_vdevs overreads on every such event with no race.\nPR:N - ath12k_wmi_op_rx() dispatches WMI_PDEV_CSA_SWITCH_COUNT_STATUS_EVENTID from the WMI HTC endpoint (ath12k_connect_pdev_htc_service) with no host uid, capability, or authentication check; the Wi-Fi firmware is the sole source of the event.\nUI:N - ath12k_wmi_process_csa_switch_count_event() reads vdev_ids[i] in the num_vdevs loop before the conf->csa_active continue, so a crafted CSA-count WMI event overreads even when the victim never started a channel switch; no mount or other user action is required.\nS:U - The vdev_ids[] overread and any oops remain inside the host kernel ath12k/mac80211 authority; the bug does not cross a VM, IOMMU, or sandbox boundary.\nC:H - Firmware-chosen num_vdevs is an unbounded u32 loop over the WMI_TAG_ARRAY_UINT32 vdev_ids payload (policy min_len 0), so the handler can read far past the CE WMI skb (~2KB); unknown vdev_ids[i] values are also printed by ath12k_warn(), which is an unbounded kernel overread, not a few bytes.\nI:N - The loop only loads vdev_ids[i] and looks them up with ath12k_mac_get_arvif_by_vdev_id(); it does not write out of bounds, and ieee80211_csa_finish() runs only for an already-valid in-CSA arvif rather than as a write primitive from the overread.\nA:H - A huge num_vdevs walks vdev_ids[] off the WMI skb while holding rcu_read_lock(), which can oops/panic on unmapped or KASAN-redzoned heap past the CE buffer and can stall RCU for a 32-bit iteration count, a full kernel availability loss."}]}], "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/wmi.c"], "versions": [{"version": "d889913205cf7ebda905b1e62c5867ed4e39f6c2", "lessThan": "d4aec20f3a84634171c139ab2e02bb2e5a5c756b", "status": "affected", "versionType": "git"}, {"version": "d889913205cf7ebda905b1e62c5867ed4e39f6c2", "lessThan": "24f7cdabea9f7ab95dbd6d8bc9ac6ec48d96a7e5", "status": "affected", "versionType": "git"}, {"version": "d889913205cf7ebda905b1e62c5867ed4e39f6c2", "lessThan": "23bed4ef132c55c9016f0c6122c8b8ba2efa2353", "status": "affected", "versionType": "git"}, {"version": "d889913205cf7ebda905b1e62c5867ed4e39f6c2", "lessThan": "bf97c9d5123859a07848462539153176db029f3a", "status": "affected", "versionType": "git"}, {"version": "d889913205cf7ebda905b1e62c5867ed4e39f6c2", "lessThan": "878654eb78c6aa0ff585baf1376567c775ca28ec", "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/wmi.c"], "versions": [{"version": "6.3", "status": "affected"}, {"version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.3", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/d4aec20f3a84634171c139ab2e02bb2e5a5c756b"}, {"url": "https://git.kernel.org/stable/c/24f7cdabea9f7ab95dbd6d8bc9ac6ec48d96a7e5"}, {"url": "https://git.kernel.org/stable/c/23bed4ef132c55c9016f0c6122c8b8ba2efa2353"}, {"url": "https://git.kernel.org/stable/c/bf97c9d5123859a07848462539153176db029f3a"}, {"url": "https://git.kernel.org/stable/c/878654eb78c6aa0ff585baf1376567c775ca28ec"}], "title": "wifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_count_event()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/wireless/ath/ath12k/wmi.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "d4aec20f3a84634171c139ab2e02bb2e5a5c756b", "status": "affected", "version": "d889913205cf7ebda905b1e62c5867ed4e39f6c2", "versionType": "git"}, {"lessThan": "24f7cdabea9f7ab95dbd6d8bc9ac6ec48d96a7e5", "status": "affected", "version": "d889913205cf7ebda905b1e62c5867ed4e39f6c2", "versionType": "git"}, {"lessThan": "23bed4ef132c55c9016f0c6122c8b8ba2efa2353", "status": "affected", "version": "d889913205cf7ebda905b1e62c5867ed4e39f6c2", "versionType": "git"}, {"lessThan": "bf97c9d5123859a07848462539153176db029f3a", "status": "affected", "version": "d889913205cf7ebda905b1e62c5867ed4e39f6c2", "versionType": "git"}, {"lessThan": "878654eb78c6aa0ff585baf1376567c775ca28ec", "status": "affected", "version": "d889913205cf7ebda905b1e62c5867ed4e39f6c2", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/wireless/ath/ath12k/wmi.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.3"}, {"lessThan": "6.3", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "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 overreads in ath12k_wmi_process_csa_switch_count_event()\n\nThere is no policy entry for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT, so\nthe parse infrastructure does not enforce a minimum length for the event\nstruct. Additionally, the num_vdevs field is taken directly from firmware\nand used as a loop bound over the vdev_ids array without checking that it\nfits within the TLV payload. Either condition can cause an out-of-bounds\nread.\n\nAdd a TLV policy entry for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT so\nthe parse infrastructure enforces a minimum length for the fixed-size event\nstruct. Add a helper ath12k_wmi_tlv_data_len() to recover the payload\nlength of a parsed TLV from the header preceding its data pointer. Use it\nin ath12k_wmi_process_csa_switch_count_event() to bound num_vdevs before\nthe loop.\n\nCompile tested only."}], "id": "CVE-2026-90408", "lastModified": "2026-10-21T13:20:54.057", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.7, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-17T17:17:40.700", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/23bed4ef132c55c9016f0c6122c8b8ba2efa2353"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/24f7cdabea9f7ab95dbd6d8bc9ac6ec48d96a7e5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/878654eb78c6aa0ff585baf1376567c775ca28ec"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/bf97c9d5123859a07848462539153176db029f3a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d4aec20f3a84634171c139ab2e02bb2e5a5c756b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d889913205cf7ebda905b1e62c5867ed4e39f6c2,bf97c9d5123859a07848462539153176db029f3a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d889913205cf7ebda905b1e62c5867ed4e39f6c2,878654eb78c6aa0ff585baf1376567c775ca28ec)"}}], "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": "6.3"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.3)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "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": "2026-09-19T09:00:14.015402+00:00", "updated": "2026-09-19T15:30:06.428969+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}