CVE-2026-90367 (GCVE-0-2026-90367)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-09-18 17:54
VLAI
Title
wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
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.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 27015b6fbcca836c6dbf196afc266e068af4aeec , < 906ad486ba5c4933d82e1ebe0685656390a48450 (git)
Affected: 27015b6fbcca836c6dbf196afc266e068af4aeec , < 594c4b7f89f9ea75dc9c50b5e4c4296db4a3d701 (git)
Affected: 27015b6fbcca836c6dbf196afc266e068af4aeec , < 6190db312b8230813f529f014b26247c6d9800d0 (git)
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Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
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          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7996/mac.c"
          ],
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              "versionType": "git"
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          "versions": [
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              "status": "unaffected",
              "version": "0",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
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                  "versionStartIncluding": "6.4",
                  "vulnerable": true
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              "operator": "OR"
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      ],
      "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": "2026-09-18T17:54:51.905Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/906ad486ba5c4933d82e1ebe0685656390a48450"
        },
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          "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",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90367",
    "datePublished": "2026-09-17T16:09:09.430Z",
    "dateReserved": "2026-09-11T19:38:34.807Z",
    "dateUpdated": "2026-09-18T17:54:51.905Z",
    "state": "PUBLISHED"
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                "programFiles": [
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                ],
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        "descriptions": [
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            "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."
          }
        ],
        "id": "CVE-2026-90367",
        "lastModified": "2026-09-18T18:17:55.483",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "ADJACENT_NETWORK",
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                "baseScore": 8.8,
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
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                "userInteraction": "NONE",
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        "published": "2026-09-17T17:17:35.813",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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