159 lines
9.1 KiB
JSON
159 lines
9.1 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-90381",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-11T19:38:34.809Z",
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"datePublished": "2026-09-17T16:09:18.603Z",
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"dateUpdated": "2026-10-19T09:02:40.869Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:02:40.869Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 8.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/wireless/mediatek/mt76/channel.c"
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],
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"versions": [
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{
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"version": "82334623af0cd2154633cdb007719a321048fafc",
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"lessThan": "7a1b971b799eae8a957acb90d8100576df889644",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "82334623af0cd2154633cdb007719a321048fafc",
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"lessThan": "063169a2755abdcbe7698d98360336abb6bef414",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "82334623af0cd2154633cdb007719a321048fafc",
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"lessThan": "70869cc429fffc77de51e7777c0ecb651e8fca07",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/wireless/mediatek/mt76/channel.c"
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],
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"versions": [
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{
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"version": "6.14",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.14",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.57",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.6",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.14",
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"versionEndExcluding": "6.18.57"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.14",
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"versionEndExcluding": "7.2.6"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.14",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/7a1b971b799eae8a957acb90d8100576df889644"
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},
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{
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"url": "https://git.kernel.org/stable/c/063169a2755abdcbe7698d98360336abb6bef414"
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},
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{
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"url": "https://git.kernel.org/stable/c/70869cc429fffc77de51e7777c0ecb651e8fca07"
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}
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],
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"title": "wifi: mt76: fix handling channel context with different bands in mt76_switch_vif_chanctx()",
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"x_generator": {
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