{"api_version":"1","generated_at":"2026-09-19T10:59:00+00:00","cve":"CVE-2026-90408","urls":{"html":"https://cve.report/CVE-2026-90408","api":"https://cve.report/api/cve/CVE-2026-90408.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-90408","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-90408"},"summary":{"title":"wifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_count_event()","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:17:40","updated_at":"2026-09-18 18:17:57"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.7","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","data":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.7","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","data":{"baseScore":7.7,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/878654eb78c6aa0ff585baf1376567c775ca28ec","name":"https://git.kernel.org/stable/c/878654eb78c6aa0ff585baf1376567c775ca28ec","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bf97c9d5123859a07848462539153176db029f3a","name":"https://git.kernel.org/stable/c/bf97c9d5123859a07848462539153176db029f3a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90408","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90408","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d889913205cf7ebda905b1e62c5867ed4e39f6c2 bf97c9d5123859a07848462539153176db029f3a git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d889913205cf7ebda905b1e62c5867ed4e39f6c2 878654eb78c6aa0ff585baf1376567c775ca28ec git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.3","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.3 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.6 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"90408","cve":"CVE-2026-90408","epss":"0.001550000","percentile":"0.050900000","score_date":"2026-09-18","updated_at":"2026-09-19 00:06:16"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"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":"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":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"6.3","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.3","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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":{"baseScore":7.7,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","version":"3.1"},"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 → ath12k_ce_recv_process_cb → ath12k_htc_rx_completion_handler → 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."}]}],"providerMetadata":{"dateUpdated":"2026-09-18T17:55:13.303Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-90408","datePublished":"2026-09-17T16:09:36.089Z","dateReserved":"2026-09-11T19:38:34.812Z","dateUpdated":"2026-09-18T17:55:13.303Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:17:40","lastModifiedDate":"2026-09-18 18:17:57","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":5.2}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"90408","Ordinal":"1","Title":"wifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_cou","CVE":"CVE-2026-90408","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"90408","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"wifi: ath12k: fix overreads in ath12k_wmi_process_csa_switch_cou"}]}}}