CVE-2026-90367 (GCVE-0-2026-90367)
Vulnerability from cvelistv5
Published
2026-09-17 16:09
Modified
2026-10-21 12:51
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: mt7996: hold dev->mt76.mutex while disabling tx worker in SER mt7996_mac_reset_work() parked the tx worker and disabled the RX/TX NAPIs before taking dev->mt76.mutex. mt76_worker_disable()/_enable() are plain kthread park/unpark, not refcounted, and __mt76_set_channel() toggles the same worker and the MT76_RESET bit under the mutex. An L1 SER racing a channel switch could therefore have the worker unparked and MT76_RESET cleared while the reset path resets the DMA rings, corrupting descriptors or tokens. Take the mutex before disabling the worker, as mt7915 does.
References
Impacted products
Vendor Product Version
Linux Linux Version: 27015b6fbcca836c6dbf196afc266e068af4aeec
Version: 27015b6fbcca836c6dbf196afc266e068af4aeec
Version: 27015b6fbcca836c6dbf196afc266e068af4aeec
Version: 27015b6fbcca836c6dbf196afc266e068af4aeec
Version: 27015b6fbcca836c6dbf196afc266e068af4aeec
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7996/mac.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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              "version": "27015b6fbcca836c6dbf196afc266e068af4aeec",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7996/mac.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.4"
            },
            {
              "lessThan": "6.4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.160",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.114",
              "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": "6.6.160",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.114",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "6.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7996: hold dev-\u003emt76.mutex while disabling tx worker in SER\n\nmt7996_mac_reset_work() parked the tx worker and disabled the RX/TX NAPIs\nbefore taking dev-\u003emt76.mutex. mt76_worker_disable()/_enable() are plain\nkthread park/unpark, not refcounted, and __mt76_set_channel() toggles the\nsame worker and the MT76_RESET bit under the mutex. An L1 SER racing a\nchannel switch could therefore have the worker unparked and MT76_RESET\ncleared while the reset path resets the DMA rings, corrupting descriptors\nor tokens. Take the mutex before disabling the worker, as mt7915 does."
        }
      ],
      "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 - mt7996_irq_tasklet() handles MT_INT_MCU_CMD, reads MT_MCU_CMD, and on ERROR_MASK (including STOP_DMA) calls mt7996_reset() to queue L1 SER; the racing worker toggle is __mt76_set_channel() from mt76_switch_vif_chanctx() on an 802.11 Channel Switch Announcement. Both legs are WiFi radio-range, not a routable IP protocol.\nAC:L - A radio peer can drive both sides: emit CSA so ieee80211_csa_switch_work() runs mt76_switch_vif_chanctx()/__mt76_set_channel() (unparking the non-refcounted tx_worker under dev-\u003emt76.mutex) and induce firmware L1 SER so mt7996_mac_reset_work() parks that worker before taking the mutex. The MCU channel-switch hold and napi_disable() are a retryable millisecond window.\nPR:N - mt7996_irq_tasklet() consumes MT_MCU_CMD and queues reset_work with no capable() or 802.11 authentication gate; CSA is parsed from beacons/action frames in ieee80211_sta_process_chanswitch() without a host uid. An unauthenticated (SER) or associated (CSA) radio peer needs no Linux privilege.\nUI:N - ieee80211_csa_switch_work() applies CSA automatically once the STA is associated, and mt7996_mac_reset_work() runs from the driver workqueue after the MCU IRQ. No local user must write debugfs sys_recovery or issue nl80211 SET_CHANNEL to create the race.\nS:U - The corrupted TX DMA descriptors (mt76_dma_queue_reset of q-\u003edesc[]) and token IDR (mt7996_tx_token_put()/idr_destroy()) belong to this host\u0027s mt7996 driver; the race does not cross a VM, IOMMU, or sandbox authority.\nC:H - If __mt76_set_channel() unparks tx_worker while mt7996_mac_reset_work() still runs mt7996_dma_reset() and mt7996_tx_token_put(), the worker can idr_alloc on a destroyed token IDR and DMA-map into q-\u003edesc[] being zeroed, a UAF/descriptor confusion that discloses kernel memory.\nI:H - The same race lets the TX worker write queue head and descriptors (mt76_dma_add_buf) while mt76_dma_queue_reset() clears q-\u003edesc[] and mt7996_tx_token_put() destroys the token IDR, a write primitive against DMA-ring and heap token objects suitable for control-flow hijack.\nA:H - Concurrent mt76_dma_tx_cleanup()/mt76_dma_queue_reset() versus a live tx_worker oopses on a freed txwi/skb or wedges the WFDMA rings; the commit\u0027s descriptor/token corruption is a kernel crash, so availability is High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:51:20.196Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bc4f4389f439e808185778d298da36976d13d415"
        },
        {
          "url": "https://git.kernel.org/stable/c/69f23622533a4f054b5c8fdb226c3319ffa017b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/906ad486ba5c4933d82e1ebe0685656390a48450"
        },
        {
          "url": "https://git.kernel.org/stable/c/594c4b7f89f9ea75dc9c50b5e4c4296db4a3d701"
        },
        {
          "url": "https://git.kernel.org/stable/c/6190db312b8230813f529f014b26247c6d9800d0"
        }
      ],
      "title": "wifi: mt76: mt7996: hold dev-\u003emt76.mutex while disabling tx worker in SER",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90367",
    "datePublished": "2026-09-17T16:09:09.430Z",
    "dateReserved": "2026-09-11T19:38:34.807Z",
    "dateUpdated": "2026-10-21T12:51:20.196Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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