{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90407", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.812Z", "datePublished": "2026-09-17T16:09:35.420Z", "dateUpdated": "2026-10-19T09:03:11.681Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:03:11.681Z" }, "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": { "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 - 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." } ] } ], "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/ath11k/wmi.c" ], "versions": [ { "version": "d5c65159f2895379e11ca13f62feabe93278985d", "lessThan": "f760b7d7e43584d2fa9bffcec1a04e502609f827", "status": "affected", "versionType": "git" }, { "version": "d5c65159f2895379e11ca13f62feabe93278985d", "lessThan": "d6625dc5f1fe42cd81b8c57a1f5317afb9b410ce", "status": "affected", "versionType": "git" }, { "version": "d5c65159f2895379e11ca13f62feabe93278985d", "lessThan": "0364926fb4bfb5b798e5fe2785b3023b4f767327", "status": "affected", "versionType": "git" }, { "version": "d5c65159f2895379e11ca13f62feabe93278985d", "lessThan": "5de2b8c53714ad58f2fda118cd29ebbe31b38665", "status": "affected", "versionType": "git" }, { "version": "d5c65159f2895379e11ca13f62feabe93278985d", "lessThan": "208d7fdb85976a737a715b81d54efaff6703880c", "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/ath11k/wmi.c" ], "versions": [ { "version": "5.6", "status": "affected" }, { "version": "0", "lessThan": "5.6", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "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": "5.6", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.6", "versionEndExcluding": "7.3" } ] } ] } ], "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" } } } }