{"api_version":"1","generated_at":"2026-10-27T04:01:46+00:00","cve":"CVE-2026-90381","urls":{"html":"https://cve.report/CVE-2026-90381","api":"https://cve.report/api/cve/CVE-2026-90381.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-90381","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-90381"},"summary":{"title":"wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()\n\nWhen performing channel switches on different radios within a short\ntimeframe, channel contexts with different bands can be carried for\neach struct ieee80211_vif_chanctx_switch.\n\nRework mt76_switch_vif_chanctx() to properly handle this scenario.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-17 17:17:37","updated_at":"2026-10-19 09:19:32"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"8.8","severity":"HIGH","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/063169a2755abdcbe7698d98360336abb6bef414","name":"https://git.kernel.org/stable/c/063169a2755abdcbe7698d98360336abb6bef414","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/70869cc429fffc77de51e7777c0ecb651e8fca07","name":"https://git.kernel.org/stable/c/70869cc429fffc77de51e7777c0ecb651e8fca07","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7a1b971b799eae8a957acb90d8100576df889644","name":"https://git.kernel.org/stable/c/7a1b971b799eae8a957acb90d8100576df889644","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-90381","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90381","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 82334623af0cd2154633cdb007719a321048fafc 7a1b971b799eae8a957acb90d8100576df889644 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 82334623af0cd2154633cdb007719a321048fafc 063169a2755abdcbe7698d98360336abb6bef414 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 82334623af0cd2154633cdb007719a321048fafc 70869cc429fffc77de51e7777c0ecb651e8fca07 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.14","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.14 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.57 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 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"90381","cve":"CVE-2026-90381","epss":"0.002180000","percentile":"0.125170000","score_date":"2026-09-21","updated_at":"2026-09-22 00:03:19"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/wireless/mediatek/mt76/channel.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"7a1b971b799eae8a957acb90d8100576df889644","status":"affected","version":"82334623af0cd2154633cdb007719a321048fafc","versionType":"git"},{"lessThan":"063169a2755abdcbe7698d98360336abb6bef414","status":"affected","version":"82334623af0cd2154633cdb007719a321048fafc","versionType":"git"},{"lessThan":"70869cc429fffc77de51e7777c0ecb651e8fca07","status":"affected","version":"82334623af0cd2154633cdb007719a321048fafc","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/wireless/mediatek/mt76/channel.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.14"},{"lessThan":"6.14","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.57","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.6","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.57","versionStartIncluding":"6.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.6","versionStartIncluding":"6.14","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"6.14","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()\n\nWhen performing channel switches on different radios within a short\ntimeframe, channel contexts with different bands can be carried for\neach struct ieee80211_vif_chanctx_switch.\n\nRework mt76_switch_vif_chanctx() to properly handle this scenario."}],"metrics":[{"cvssV3_1":{"baseScore":8.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:A - CSA IEs in a received Beacon (ieee80211_rx_mgmt_beacon → ieee80211_sta_process_chanswitch → ieee80211_link_reserve_chanctx) or Channel Switch action frame (ieee80211_sta_rx_queued_mgmt) make ieee80211_chsw_switch_vifs call mt76_switch_vif_chanctx with one ieee80211_vif_chanctx_switch per radio; those 802.11 frames are radio-range, not a routable IP protocol.\nAC:L - ieee80211_vif_use_reserved_switch returns -EAGAIN until every in-place reservation is reserved_ready, then ieee80211_chsw_switch_vifs batches them into one CHANCTX_SWMODE_SWAP_CONTEXTS call; an AP/MLD that puts CSA IEs on two mt7996 bands with matching counts makes both ready in order with no victim-only race.\nPR:N - ieee80211_rx_mgmt_beacon only needs ieee80211_rx_our_beacon() BSSID match on an associated STA, and mt7996 sets CHANCTX_STA_CSA so this path is used; beacons are unauthenticated, so the AP or a radio-range BSSID spoof needs no Linux capability or account.\nUI:N - An already-associated station runs ieee80211_csa_switch_work → ieee80211_link_use_reserved_context when the CSA count elapses and automatically enters mt76_switch_vif_chanctx; no extra click, reconnect, or mount is required at trigger time.\nS:U - Aliased mlink->ctx, the leftover phy->chanctx on non-first radios, and any resulting host-kernel heap UAF stay inside this machine’s mt76/mac80211; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The pre-fix function set every mlink->ctx to vifs[0].new_ctx. After that first ieee80211_chanctx is kfree_rcu’d (ieee80211_free_chanctx when the first vif/link unassigns while others remain), mt76_vif_link_phy() still does mlink->ctx->drv_priv and reads ctx->phy from the freed object, a kernel info-leak UAF.\nI:H - The same dangling mlink->ctx makes mt76_vif_link_phy() return ctx->phy from reallocatable freed ieee80211_chanctx memory; callers such as mt7996_link_info_changed then issue MCU updates (mt7996_mcu_add_bss_info and similar) through that forged mt76_phy pointer, a kernel write/control-flow primitive.\nA:H - mt76_vif_link_phy() on the stale mlink->ctx oopses after the aliased chanctx is freed; the pre-fix path also skipped mt76_phy_update_channel for every radio but vifs[0], leaving that PHY’s phy->chanctx pointing at the old ctx that ieee80211_vif_use_reserved_switch kfree_rcu’s, taking the radio down."}]}],"providerMetadata":{"dateUpdated":"2026-10-19T09:02:40.869Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/7a1b971b799eae8a957acb90d8100576df889644"},{"url":"https://git.kernel.org/stable/c/063169a2755abdcbe7698d98360336abb6bef414"},{"url":"https://git.kernel.org/stable/c/70869cc429fffc77de51e7777c0ecb651e8fca07"}],"title":"wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-90381","datePublished":"2026-09-17T16:09:18.603Z","dateReserved":"2026-09-11T19:38:34.809Z","dateUpdated":"2026-10-19T09:02:40.869Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-17 17:17:37","lastModifiedDate":"2026-10-19 09:19:32","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:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"ADJACENT_NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"90381","Ordinal":"1","Title":"wifi: mt76: fix handling channel context with different bands in","CVE":"CVE-2026-90381","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"90381","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()\n\nWhen performing channel switches on different radios within a short\ntimeframe, channel contexts with different bands can be carried for\neach struct ieee80211_vif_chanctx_switch.\n\nRework mt76_switch_vif_chanctx() to properly handle this scenario.","Type":"Description","Title":"wifi: mt76: fix handling channel context with different bands in"}]}}}