{"api_version":"1","generated_at":"2026-09-19T10:58:47+00:00","cve":"CVE-2026-90407","urls":{"html":"https://cve.report/CVE-2026-90407","api":"https://cve.report/api/cve/CVE-2026-90407.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-90407","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-90407"},"summary":{"title":"wifi: ath11k: fix overreads in ath11k_wmi_process_csa_switch_count_event()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath11k: fix overreads in ath11k_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 ath11k_wmi_tlv_data_len() to recover the payload\nlength of a parsed TLV from the header preceding its data pointer. Use it\nin ath11k_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/f760b7d7e43584d2fa9bffcec1a04e502609f827","name":"https://git.kernel.org/stable/c/f760b7d7e43584d2fa9bffcec1a04e502609f827","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/208d7fdb85976a737a715b81d54efaff6703880c","name":"https://git.kernel.org/stable/c/208d7fdb85976a737a715b81d54efaff6703880c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5de2b8c53714ad58f2fda118cd29ebbe31b38665","name":"https://git.kernel.org/stable/c/5de2b8c53714ad58f2fda118cd29ebbe31b38665","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/0364926fb4bfb5b798e5fe2785b3023b4f767327","name":"https://git.kernel.org/stable/c/0364926fb4bfb5b798e5fe2785b3023b4f767327","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce","name":"https://git.kernel.org/stable/c/d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90407","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90407","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d5c65159f2895379e11ca13f62feabe93278985d f760b7d7e43584d2fa9bffcec1a04e502609f827 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d5c65159f2895379e11ca13f62feabe93278985d d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d5c65159f2895379e11ca13f62feabe93278985d 0364926fb4bfb5b798e5fe2785b3023b4f767327 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d5c65159f2895379e11ca13f62feabe93278985d 5de2b8c53714ad58f2fda118cd29ebbe31b38665 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected d5c65159f2895379e11ca13f62feabe93278985d 208d7fdb85976a737a715b81d54efaff6703880c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.6","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.6 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.157 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.110 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.52 6.18.* 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":"90407","cve":"CVE-2026-90407","epss":"0.002000000","percentile":"0.101470000","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/ath11k/wmi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f760b7d7e43584d2fa9bffcec1a04e502609f827","status":"affected","version":"d5c65159f2895379e11ca13f62feabe93278985d","versionType":"git"},{"lessThan":"d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce","status":"affected","version":"d5c65159f2895379e11ca13f62feabe93278985d","versionType":"git"},{"lessThan":"0364926fb4bfb5b798e5fe2785b3023b4f767327","status":"affected","version":"d5c65159f2895379e11ca13f62feabe93278985d","versionType":"git"},{"lessThan":"5de2b8c53714ad58f2fda118cd29ebbe31b38665","status":"affected","version":"d5c65159f2895379e11ca13f62feabe93278985d","versionType":"git"},{"lessThan":"208d7fdb85976a737a715b81d54efaff6703880c","status":"affected","version":"d5c65159f2895379e11ca13f62feabe93278985d","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/wireless/ath/ath11k/wmi.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.6"},{"lessThan":"5.6","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.157","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.110","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.52","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":"6.6.157","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"5.6","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.6","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath11k: fix overreads in ath11k_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 ath11k_wmi_tlv_data_len() to recover the payload\nlength of a parsed TLV from the header preceding its data pointer. Use it\nin ath11k_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 - The malformed bytes are firmware WMI_PDEV_CSA_SWITCH_COUNT_STATUS_EVENTID TLVs on CE2 (ath11k_ce_recv_process_cb → ath11k_htc_rx_completion_handler → ath11k_wmi_tlv_op_rx). num_vdevs and the event/ARRAY_UINT32 lengths are built by firmware, not taken from an 802.11 CSA IE, so this is a host-firmware HTC path, not WiFi frame injection.\nAC:L - wmi_tlv_policies had no min_len for WMI_TAG_PDEV_CSA_SWITCH_COUNT_STATUS_EVENT, and ath11k_wmi_process_csa_switch_count_event() used ev->num_vdevs as the vdev_ids[] bound with no compare to the ARRAY_UINT32 TLV length. Firmware setting current_switch_count=0 and an oversized num_vdevs makes the overread deterministic, with no race.\nPR:N - ath11k_wmi_tlv_op_rx() dispatches WMI_PDEV_CSA_SWITCH_COUNT_STATUS_EVENTID from the WMI HTC rx callback with no host uid, capability, or authentication check; the device firmware is the sole source of the event struct and vdev_ids array.\nUI:N - Firmware can send WMI_PDEV_CSA_SWITCH_COUNT_STATUS_EVENTID unsolicited on the WMI RX path; the overread of ev->current_switch_count/num_vdevs and vdev_ids[i] runs before the csa_active check and does not require the victim to start a channel switch, mount media, or open a file.\nS:U - The out-of-bounds loads of ev fields and vdev_ids[] stay inside the host kernel ath11k WMI parser and the CE RX skb heap; they do not cross a VM, IOMMU, or other separate security authority.\nC:H - ev->num_vdevs is a firmware u32 used as an unbounded index over vdev_ids[], so a count past the ARRAY_UINT32 TLV reads kernel heap beyond the WMI skb; unknown ids are also printed by ath11k_warn(\"Recvd csa status for unknown vdev %d\"). That is not a few-byte leak.\nI:N - The loop only reads vdev_ids[i] into ath11k_mac_get_arvif_by_vdev_id(); it never writes through the overread pointer. ieee80211_csa_finish() runs only if a looked-up vif already has csa_active, which is not an OOB write or hijack primitive from the overread.\nA:H - A firmware-chosen num_vdevs that walks vdev_ids[] past the CE RX skb can load from unmapped heap and oops/panic in ath11k_wmi_process_csa_switch_count_event(), which is a full kernel availability loss."}]}],"providerMetadata":{"dateUpdated":"2026-09-18T17:55:12.082Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f760b7d7e43584d2fa9bffcec1a04e502609f827"},{"url":"https://git.kernel.org/stable/c/d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce"},{"url":"https://git.kernel.org/stable/c/0364926fb4bfb5b798e5fe2785b3023b4f767327"},{"url":"https://git.kernel.org/stable/c/5de2b8c53714ad58f2fda118cd29ebbe31b38665"},{"url":"https://git.kernel.org/stable/c/208d7fdb85976a737a715b81d54efaff6703880c"}],"title":"wifi: ath11k: fix overreads in ath11k_wmi_process_csa_switch_count_event()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-90407","datePublished":"2026-09-17T16:09:35.420Z","dateReserved":"2026-09-11T19:38:34.812Z","dateUpdated":"2026-09-18T17:55:12.082Z","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":"90407","Ordinal":"1","Title":"wifi: ath11k: fix overreads in ath11k_wmi_process_csa_switch_cou","CVE":"CVE-2026-90407","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"90407","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: ath11k: fix overreads in ath11k_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 ath11k_wmi_tlv_data_len() to recover the payload\nlength of a parsed TLV from the header preceding its data pointer. Use it\nin ath11k_wmi_process_csa_switch_count_event() to bound num_vdevs before\nthe loop.\n\nCompile tested only.","Type":"Description","Title":"wifi: ath11k: fix overreads in ath11k_wmi_process_csa_switch_cou"}]}}}