CVE-2026-68193 (GCVE-0-2026-68193)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:00 – Updated: 2026-08-17 05:00
VLAI
Title
wifi: mt76: mt7925: drop TXRX_NOTIFY on non-mmio buses
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7925: drop TXRX_NOTIFY on non-mmio buses PKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7925_rx_check() and mt7925_queue_rx_skb() dispatch it to mt7925_mac_tx_free() on every bus. mt7925_mac_tx_free() cleans the DMA tx queues with mt76_queue_tx_cleanup(), which calls queue_ops->tx_cleanup(). Only the mmio queue ops implement that callback; on USB it is NULL, so a TXRX_NOTIFY there calls a NULL pointer in the RX worker: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:0x0 Call Trace: mt7925_mac_tx_free+0x58/0x350 [mt7925_common] mt7925_rx_check+0xe2/0x130 [mt7925_common] mt76u_rx_worker+0x1b9/0x620 [mt76_usb] Drop the event on non-mmio buses via mt76_is_mmio(), as in commit 5683e1488aa9 ("wifi: mt76: connac: do not check WED status for non-mmio devices").
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c948b5da6bbec742b433138e3e3f9537a85af2e5 , < 0c8c4cd0ca60b45c4b05a39e3769b8473d6836eb (git)
Affected: c948b5da6bbec742b433138e3e3f9537a85af2e5 , < 9cb72f67e1502aabba51aab9ac04ae7c386ee194 (git)
Affected: c948b5da6bbec742b433138e3e3f9537a85af2e5 , < 9677e86a5f7d680fe280a5f8999bc57353e360d7 (git)
Affected: c948b5da6bbec742b433138e3e3f9537a85af2e5 , < feeff151c83e7f0ffcdedcad5343852d23d1f6e1 (git)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7925/mac.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "c948b5da6bbec742b433138e3e3f9537a85af2e5",
              "versionType": "git"
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          "product": "Linux",
          "programFiles": [
            "drivers/net/wireless/mediatek/mt76/mt7925/mac.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "6.7"
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              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.101",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.42",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.6",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7925: drop TXRX_NOTIFY on non-mmio buses\n\nPKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7925_rx_check() and\nmt7925_queue_rx_skb() dispatch it to mt7925_mac_tx_free() on every bus.\nmt7925_mac_tx_free() cleans the DMA tx queues with\nmt76_queue_tx_cleanup(), which calls queue_ops-\u003etx_cleanup(). Only the\nmmio queue ops implement that callback; on USB it is NULL, so a\nTXRX_NOTIFY there calls a NULL pointer in the RX worker:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000000\n  RIP: 0010:0x0\n  Call Trace:\n   mt7925_mac_tx_free+0x58/0x350 [mt7925_common]\n   mt7925_rx_check+0xe2/0x130 [mt7925_common]\n   mt76u_rx_worker+0x1b9/0x620 [mt76_usb]\n\nDrop the event on non-mmio buses via mt76_is_mmio(), as in\ncommit 5683e1488aa9 (\"wifi: mt76: connac: do not check WED status for\nnon-mmio devices\")."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:00:36.015Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/0c8c4cd0ca60b45c4b05a39e3769b8473d6836eb"
        },
        {
          "url": "https://git.kernel.org/stable/c/9cb72f67e1502aabba51aab9ac04ae7c386ee194"
        },
        {
          "url": "https://git.kernel.org/stable/c/9677e86a5f7d680fe280a5f8999bc57353e360d7"
        },
        {
          "url": "https://git.kernel.org/stable/c/feeff151c83e7f0ffcdedcad5343852d23d1f6e1"
        }
      ],
      "title": "wifi: mt76: mt7925: drop TXRX_NOTIFY on non-mmio buses",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68193",
    "datePublished": "2026-08-10T12:00:11.110Z",
    "dateReserved": "2026-07-30T09:28:09.373Z",
    "dateUpdated": "2026-08-17T05:00:36.015Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-68193",
      "date": "2026-08-20",
      "epss": "0.002",
      "percentile": "0.1018"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-68193\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-10T13:20:06.667\",\"lastModified\":\"2026-08-17T05:18:21.147\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nwifi: mt76: mt7925: drop TXRX_NOTIFY on non-mmio buses\\n\\nPKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7925_rx_check() and\\nmt7925_queue_rx_skb() dispatch it to mt7925_mac_tx_free() on every bus.\\nmt7925_mac_tx_free() cleans the DMA tx queues with\\nmt76_queue_tx_cleanup(), which calls queue_ops-\u003etx_cleanup(). Only the\\nmmio queue ops implement that callback; on USB it is NULL, so a\\nTXRX_NOTIFY there calls a NULL pointer in the RX worker:\\n\\n  BUG: kernel NULL pointer dereference, address: 0000000000000000\\n  RIP: 0010:0x0\\n  Call Trace:\\n   mt7925_mac_tx_free+0x58/0x350 [mt7925_common]\\n   mt7925_rx_check+0xe2/0x130 [mt7925_common]\\n   mt76u_rx_worker+0x1b9/0x620 [mt76_usb]\\n\\nDrop the event on non-mmio buses via mt76_is_mmio(), as in\\ncommit 5683e1488aa9 (\\\"wifi: mt76: connac: do not check WED status for\\nnon-mmio devices\\\").\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/net/wireless/mediatek/mt76/mt7925/mac.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c948b5da6bbec742b433138e3e3f9537a85af2e5\",\"lessThan\":\"0c8c4cd0ca60b45c4b05a39e3769b8473d6836eb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c948b5da6bbec742b433138e3e3f9537a85af2e5\",\"lessThan\":\"9cb72f67e1502aabba51aab9ac04ae7c386ee194\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c948b5da6bbec742b433138e3e3f9537a85af2e5\",\"lessThan\":\"9677e86a5f7d680fe280a5f8999bc57353e360d7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c948b5da6bbec742b433138e3e3f9537a85af2e5\",\"lessThan\":\"feeff151c83e7f0ffcdedcad5343852d23d1f6e1\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/net/wireless/mediatek/mt76/mt7925/mac.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0c8c4cd0ca60b45c4b05a39e3769b8473d6836eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9677e86a5f7d680fe280a5f8999bc57353e360d7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9cb72f67e1502aabba51aab9ac04ae7c386ee194\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/feeff151c83e7f0ffcdedcad5343852d23d1f6e1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T19:46:17+00:00",
      "cve": "CVE-2026-68193",
      "id": "CVE-2026-68193",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_affected": "183",
      "product_status:known_not_affected": "93",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: mt76: mt7925: drop TXRX_NOTIFY on non-mmio buses",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68193.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-13T01:28:19Z",
      "cve": "CVE-2026-68193",
      "id": "CVE-2026-68193",
      "initial_release_date": "2026-08-12T16:22:54Z",
      "product_status:known_affected": "30",
      "product_status:known_not_affected": "266",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-68193",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-68193.json",
      "version": "3"
    }
  }
}



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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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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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