CVE-2026-90371 (GCVE-0-2026-90371)
Vulnerability from cvelistv5
Published
2026-09-17 16:09
Modified
2026-10-19 09:02
Severity ?
8.8 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: fix RXDMAD_C buffer recycling race The RXDMAD_C buffers come from the RRO data queues' page pools, which are bound to a different NAPI, so the direct page-pool recycle used here could race the owning NAPI; take the non-direct path as is already done for WED RX queues.
References
Impacted products
Vendor Product Version
Linux Linux Version: e50d4d710efd2dbc46965e9608bbb502bcfc5c99
Version: e50d4d710efd2dbc46965e9608bbb502bcfc5c99
Version: e50d4d710efd2dbc46965e9608bbb502bcfc5c99
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/dma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7ac05ed3a50e511c93f8506e555709a208dfce0a",
              "status": "affected",
              "version": "e50d4d710efd2dbc46965e9608bbb502bcfc5c99",
              "versionType": "git"
            },
            {
              "lessThan": "a273dc3b86a7d983d643827d3d3c795d55d8f632",
              "status": "affected",
              "version": "e50d4d710efd2dbc46965e9608bbb502bcfc5c99",
              "versionType": "git"
            },
            {
              "lessThan": "e1f97c10a4ec2b9db69a134b757304399ca903ce",
              "status": "affected",
              "version": "e50d4d710efd2dbc46965e9608bbb502bcfc5c99",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/dma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "lessThan": "6.18",
              "status": "unaffected",
              "version": "0",
              "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "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\u0027 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."
        }
      ],
      "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 - 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\u2192mt76_dma_rx_process\u2192mt76_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\u2192page_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-\u003eq_rx[t-\u003eqid]-\u003epage_pool) in the same kernel; it does not cross a VM, IOMMU, or guest/host boundary.\nC:H - Concurrent lockless updates of pool-\u003ealloc.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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:02:30.177Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7ac05ed3a50e511c93f8506e555709a208dfce0a"
        },
        {
          "url": "https://git.kernel.org/stable/c/a273dc3b86a7d983d643827d3d3c795d55d8f632"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1f97c10a4ec2b9db69a134b757304399ca903ce"
        }
      ],
      "title": "wifi: mt76: fix RXDMAD_C buffer recycling race",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90371",
    "datePublished": "2026-09-17T16:09:12.046Z",
    "dateReserved": "2026-09-11T19:38:34.808Z",
    "dateUpdated": "2026-10-19T09:02:30.177Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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