CVE-2026-90372

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90372", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.808Z", "datePublished": "2026-09-17T16:09:12.733Z", "dateUpdated": "2026-10-19T09:02:31.113Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:02:31.113Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss\n\nIf a peer's VHT/HE MCS map has no supported spatial stream (all fields\n0x3), the loop exits with nss == 0 and the function returned (u8)-1 (255),\nwhich was then written into the firmware sta_rec_bf beamforming fields.\nClamp the result to 0."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "baseScore": 7.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:A - A nearby 802.11 peer supplies the malformed MCS map in the HE Capabilities MCS NSS field of an Association Request. hostapd's NL80211_CMD_NEW_STATION reaches ieee80211_add_station()\u2192sta_link_apply_parameters(), which copies he_mcs_nss_supp; mt76_sta_state(AUTH\u2192ASSOC) then calls mt7915_mcu_get_sta_nss() on that map. WiFi radio range is Adjacent.\nAC:L - The attacker sets every 2-bit NSS field in HE rx_mcs_80 or rx_mcs_160 to 0x3. mt7915_mcu_get_sta_nss() then leaves its nss=8..1 loop with nss==0 and returns (u8)-1 (255) on every association. mac80211 does not reject an all-0x3 HE MCS map (unlike the 0xFFFF VHT check in ieee80211_vht_cap_ie_to_sta_vht_cap()). No race is involved.\nPR:N - mt7915_mac_sta_event(MT76_STA_EVENT_ASSOC) runs from sta_info_move_state(IEEE80211_STA_ASSOC) when hostapd's NL80211_CMD_NEW_STATION sets ASSOCIATED, before AUTHORIZED (the WPA 4-way handshake). 802.11 Open System authentication does not require a PSK or SAE credential on this path.\nUI:N - The attacker transmits the Association Request. ieee80211_add_station() and mt7915_mcu_add_sta() run in the AP kernel with no operator action on the victim device.\nS:U - The underflowed NSS is stored in the kernel sta_rec_bf TLV and sent to the on-device mt7915 MCU via MCU_EXT_CMD(STA_REC_UPDATE). Impact stays in the same kernel/device authority; this is not a VM, IOMMU, or sandbox escape.\nC:N - mt7915_mcu_get_sta_nss() only derives a u8 from the peer MCS map. That 255 is stored in sta_rec_bf.ncol_gt_bw80 or ibf_ncol; ncol used to index matrix[4][4] is min()'d with nrow, so there is no kernel OOB read and nothing is returned over the air.\nI:L - mt7915_mcu_sta_bfer_he() writes the underflowed nss_mcs (255) directly to sta_rec_bf.ncol_gt_bw80 on 160 MHz, and the implicit-VHT path writes it to ibf_ncol, then mt7915_mcu_add_sta() sends that TLV to firmware. That is a limited corruption of the chip beamforming profile, not an arbitrary kernel write.\nA:H - ncol_gt_bw80 and ibf_ncol are NSS counts the mt7915 MCU uses as beamforming dimensions. 255 is far outside the 0\u20133 range implied by the driver's matrix[4][4], so the firmware can hang or crash and take the radio down, and the peer can retrigger it on every association."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/mediatek/mt76/mt7915/mcu.c"], "versions": [{"version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "lessThan": "2801477c36a19be4f549fe60e54995f03b0ea7b9", "status": "affected", "versionType": "git"}, {"version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "lessThan": "38f4d6323bcd65e41a691432eddabd2b03acdeee", "status": "affected", "versionType": "git"}, {"version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "lessThan": "25f753f7f620955a8a51e63e445d8b9076c51396", "status": "affected", "versionType": "git"}, {"version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "lessThan": "e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6", "status": "affected", "versionType": "git"}, {"version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "lessThan": "85bd46ab7674b6d357f9a14791352c65fb09eee9", "status": "affected", "versionType": "git"}, {"version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "lessThan": "6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7", "status": "affected", "versionType": "git"}, {"version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "lessThan": "ecfd1a07e78c31d81322fb2d81dc468081cc3004", "status": "affected", "versionType": "git"}, {"version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "lessThan": "4a2f4be532e3ea4e2b536e411793a05aaa51af25", "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/mediatek/mt76/mt7915/mcu.c"], "versions": [{"version": "5.8", "status": "affected"}, {"version": "0", "lessThan": "5.8", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.188", "lessThanOrEqual": "6.1.*", "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": "5.8", "versionEndExcluding": "5.10.270"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "5.15.221"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.1.188"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.6.157"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.8", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/2801477c36a19be4f549fe60e54995f03b0ea7b9"}, {"url": "https://git.kernel.org/stable/c/38f4d6323bcd65e41a691432eddabd2b03acdeee"}, {"url": "https://git.kernel.org/stable/c/25f753f7f620955a8a51e63e445d8b9076c51396"}, {"url": "https://git.kernel.org/stable/c/e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6"}, {"url": "https://git.kernel.org/stable/c/85bd46ab7674b6d357f9a14791352c65fb09eee9"}, {"url": "https://git.kernel.org/stable/c/6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7"}, {"url": "https://git.kernel.org/stable/c/ecfd1a07e78c31d81322fb2d81dc468081cc3004"}, {"url": "https://git.kernel.org/stable/c/4a2f4be532e3ea4e2b536e411793a05aaa51af25"}], "title": "wifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/wireless/mediatek/mt76/mt7915/mcu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "2801477c36a19be4f549fe60e54995f03b0ea7b9", "status": "affected", "version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "versionType": "git"}, {"lessThan": "38f4d6323bcd65e41a691432eddabd2b03acdeee", "status": "affected", "version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "versionType": "git"}, {"lessThan": "25f753f7f620955a8a51e63e445d8b9076c51396", "status": "affected", "version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "versionType": "git"}, {"lessThan": "e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6", "status": "affected", "version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "versionType": "git"}, {"lessThan": "85bd46ab7674b6d357f9a14791352c65fb09eee9", "status": "affected", "version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "versionType": "git"}, {"lessThan": "6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7", "status": "affected", "version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "versionType": "git"}, {"lessThan": "ecfd1a07e78c31d81322fb2d81dc468081cc3004", "status": "affected", "version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "versionType": "git"}, {"lessThan": "4a2f4be532e3ea4e2b536e411793a05aaa51af25", "status": "affected", "version": "89029a85482cbcf68026a89fc974e8f6898d6b37", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/wireless/mediatek/mt76/mt7915/mcu.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.8"}, {"lessThan": "5.8", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "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", "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: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss\n\nIf a peer's VHT/HE MCS map has no supported spatial stream (all fields\n0x3), the loop exits with nss == 0 and the function returned (u8)-1 (255),\nwhich was then written into the firmware sta_rec_bf beamforming fields.\nClamp the result to 0."}], "id": "CVE-2026-90372", "lastModified": "2026-10-19T09:19:31.170", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.2, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-17T17:17:36.363", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/25f753f7f620955a8a51e63e445d8b9076c51396"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2801477c36a19be4f549fe60e54995f03b0ea7b9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/38f4d6323bcd65e41a691432eddabd2b03acdeee"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4a2f4be532e3ea4e2b536e411793a05aaa51af25"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/85bd46ab7674b6d357f9a14791352c65fb09eee9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ecfd1a07e78c31d81322fb2d81dc468081cc3004"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89029a85482cbcf68026a89fc974e8f6898d6b37,2801477c36a19be4f549fe60e54995f03b0ea7b9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89029a85482cbcf68026a89fc974e8f6898d6b37,38f4d6323bcd65e41a691432eddabd2b03acdeee)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89029a85482cbcf68026a89fc974e8f6898d6b37,25f753f7f620955a8a51e63e445d8b9076c51396)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89029a85482cbcf68026a89fc974e8f6898d6b37,e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89029a85482cbcf68026a89fc974e8f6898d6b37,85bd46ab7674b6d357f9a14791352c65fb09eee9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89029a85482cbcf68026a89fc974e8f6898d6b37,6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89029a85482cbcf68026a89fc974e8f6898d6b37,ecfd1a07e78c31d81322fb2d81dc468081cc3004)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[89029a85482cbcf68026a89fc974e8f6898d6b37,4a2f4be532e3ea4e2b536e411793a05aaa51af25)"}}], "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": "5.8"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.8)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.270,6.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.221,6.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.188,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.157,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "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": "2026-09-19T07:30:16.929697+00:00", "updated": "2026-09-19T15:45:16.343813+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-189"]}