159 lines
8.7 KiB
JSON
159 lines
8.7 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-2026-90371",
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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": "2026-09-11T19:38:34.808Z",
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"datePublished": "2026-09-17T16:09:12.046Z",
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"dateUpdated": "2026-10-19T09:02:30.177Z"
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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": "2026-10-19T09:02:30.177Z"
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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 RXDMAD_C buffer recycling race\n\nThe RXDMAD_C buffers come from the RRO data queues' page pools, which are\nbound to a different NAPI, so the direct page-pool recycle used here could\nrace the owning NAPI; take the non-direct path as is already done for WED\nRX queues."
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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 - Received 802.11 frames are completed by HW-RRO v3.1 into the RXDMAD_C ring; mt7996_irq_handler/mt7996_irq_tasklet schedules napi[MT_RXQ_RRO_RXDMAD_C] and mt76_dma_rx_poll→mt76_dma_rx_process→mt76_dma_get_rxdmad_c_buf recycles those payload pages. A radio-range peer supplies the frames; WiFi is adjacent, not a routable IP transport.\nAC:L - The attacker drives both NAPIs by flooding 802.11 traffic: the RRO data-queue NAPI runs mt76_dma_rx_fill→page_pool_alloc_frag on the owning pool, while RXDMAD_C drops completions (SDL0 vs SKB_WITH_OVERHEAD of MT7996_RX_BUF_SIZE, or extra frags in mt76_add_fragment) and calls mt76_put_page_pool_buf(..., true) into the same unlocked alloc.cache.\nPR:N - mt76_dma_get_rxdmad_c_buf runs on the WiFi RX DMA completion path with no host credential check; a nearby unauthenticated station can send frames that HW-RRO v3.1 writes into RXDMAD_C (rx_token_id/SDL0) without any kernel account.\nUI:N - With the mt7996/mt7992 interface already up in HWRRO v3.1, the attacker triggers mt76_dma_rx_process on MT_RXQ_RRO_RXDMAD_C solely by transmitting frames; no mount, click, or other victim action is required.\nS:U - The race corrupts the host kernel page_pool alloc.cache for the RRO data queues (dev->q_rx[t->qid]->page_pool) in the same kernel; it does not cross a VM, IOMMU, or guest/host boundary.\nC:H - Concurrent lockless updates of pool->alloc.cache/count in page_pool_recycle_in_cache versus page_pool_alloc_frag can issue the same RX page twice or return a stale pointer, a use-after-free of packet buffers that enables disclosure of kernel or packet memory.\nI:H - The same unlocked recycle can bump alloc.count past PP_ALLOC_CACHE_SIZE so a later page_pool_recycle_in_cache writes a netmem pointer out of bounds, and a double-issued page lets attacker-controlled 802.11 DMA clobber reused kernel memory.\nA:H - A corrupted page_pool alloc.cache yields invalid page pointers and use-after-free in mt76_dma_rx_fill/mt76_dma_rx_process, which oopses or panics the kernel."
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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/dma.c"
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],
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"versions": [
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{
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"version": "e50d4d710efd2dbc46965e9608bbb502bcfc5c99",
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"lessThan": "7ac05ed3a50e511c93f8506e555709a208dfce0a",
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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": "e50d4d710efd2dbc46965e9608bbb502bcfc5c99",
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"lessThan": "a273dc3b86a7d983d643827d3d3c795d55d8f632",
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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": "e50d4d710efd2dbc46965e9608bbb502bcfc5c99",
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"lessThan": "e1f97c10a4ec2b9db69a134b757304399ca903ce",
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"status": "affected",
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"versionType": "git"
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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/dma.c"
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],
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"versions": [
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{
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"version": "6.18",
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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": "6.18",
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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": "6.18.52",
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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": "6.18",
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"versionEndExcluding": "6.18.52"
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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": "6.18",
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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": "6.18",
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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/7ac05ed3a50e511c93f8506e555709a208dfce0a"
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},
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{
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"url": "https://git.kernel.org/stable/c/a273dc3b86a7d983d643827d3d3c795d55d8f632"
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},
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{
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"url": "https://git.kernel.org/stable/c/e1f97c10a4ec2b9db69a134b757304399ca903ce"
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}
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],
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"title": "wifi: mt76: fix RXDMAD_C buffer recycling race",
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"x_generator": {
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} |