{"api_version":"1","generated_at":"2026-09-18T23:46:27+00:00","cve":"CVE-2026-90372","urls":{"html":"https://cve.report/CVE-2026-90372","api":"https://cve.report/api/cve/CVE-2026-90372.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-90372","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-90372"},"summary":{"title":"wifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:17:36","updated_at":"2026-09-18 18:17:55"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","data":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.1","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","data":{"baseScore":7.1,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/25f753f7f620955a8a51e63e445d8b9076c51396","name":"https://git.kernel.org/stable/c/25f753f7f620955a8a51e63e445d8b9076c51396","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ecfd1a07e78c31d81322fb2d81dc468081cc3004","name":"https://git.kernel.org/stable/c/ecfd1a07e78c31d81322fb2d81dc468081cc3004","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/85bd46ab7674b6d357f9a14791352c65fb09eee9","name":"https://git.kernel.org/stable/c/85bd46ab7674b6d357f9a14791352c65fb09eee9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/2801477c36a19be4f549fe60e54995f03b0ea7b9","name":"https://git.kernel.org/stable/c/2801477c36a19be4f549fe60e54995f03b0ea7b9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6","name":"https://git.kernel.org/stable/c/e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4a2f4be532e3ea4e2b536e411793a05aaa51af25","name":"https://git.kernel.org/stable/c/4a2f4be532e3ea4e2b536e411793a05aaa51af25","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7","name":"https://git.kernel.org/stable/c/6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/38f4d6323bcd65e41a691432eddabd2b03acdeee","name":"https://git.kernel.org/stable/c/38f4d6323bcd65e41a691432eddabd2b03acdeee","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90372","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90372","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 89029a85482cbcf68026a89fc974e8f6898d6b37 2801477c36a19be4f549fe60e54995f03b0ea7b9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 89029a85482cbcf68026a89fc974e8f6898d6b37 38f4d6323bcd65e41a691432eddabd2b03acdeee git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 89029a85482cbcf68026a89fc974e8f6898d6b37 25f753f7f620955a8a51e63e445d8b9076c51396 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 89029a85482cbcf68026a89fc974e8f6898d6b37 e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.221 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.188 6.1.* 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":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"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-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.270","versionStartIncluding":"5.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.221","versionStartIncluding":"5.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.188","versionStartIncluding":"5.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.157","versionStartIncluding":"5.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.110","versionStartIncluding":"5.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.52","versionStartIncluding":"5.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"5.8","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.8","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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":{"baseScore":7.1,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","version":"3.1"},"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()→sta_link_apply_parameters(), which copies he_mcs_nss_supp; mt76_sta_state(AUTH→ASSOC) 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 0–3 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."}]}],"providerMetadata":{"dateUpdated":"2026-09-18T17:54:54.603Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"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"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-90372","datePublished":"2026-09-17T16:09:12.733Z","dateReserved":"2026-09-11T19:38:34.808Z","dateUpdated":"2026-09-18T17:54:54.603Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:17:36","lastModifiedDate":"2026-09-18 18:17:55","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":4.2}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"90372","Ordinal":"1","Title":"wifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_ns","CVE":"CVE-2026-90372","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"90372","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"wifi: mt76: mt7915: avoid nss underflow in mt7915_mcu_get_sta_ns"}]}}}