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CVE-2026-74323 (GCVE-0-2026-74323)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:58 – Updated: 2026-08-17 05:45
VLAI
Title
wifi: mt76: mt7996: Fix possible token leak in mt7996_tx_prepare_skb()
Summary
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7996: Fix possible token leak in mt7996_tx_prepare_skb() If link_conf or link_sta lookup fails in mt7996_tx_prepare_skb routine, mt7996 driver leaks an already allocated tx token. Fix the issue releasing the token in case of error.
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: 7ef0c7ad735b0c38140259519a3f165bee2b857c , < 06e65d6cf80490bc0457d339595d1ed5a89e8899 (git)
Affected: 7ef0c7ad735b0c38140259519a3f165bee2b857c , < fa0e9aa92a7bc97fc42014c5efaaf1278fa92723 (git)
Affected: 7ef0c7ad735b0c38140259519a3f165bee2b857c , < 831074096d0450308357271fc0ffd3f600a2487e (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 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/mt7996/mac.c",
            "drivers/net/wireless/mediatek/mt76/tx.c"
          ],
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                  "versionStartIncluding": "6.18",
                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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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: Fix possible token leak in mt7996_tx_prepare_skb()\n\nIf link_conf or link_sta lookup fails in mt7996_tx_prepare_skb routine,\nmt7996 driver leaks an already allocated tx token. Fix the issue\nreleasing the token in case of error."
        }
      ],
      "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 - The flaw is in mt7996 TX preparation for EAPOL frames on MLO stations; a nearby WiFi attacker can trigger WPA authentication/rekey traffic that drives this driver TX path on APs, routers, and clients using MediaTek mt7996 hardware.\nAC:L - An attacker can repeatedly initiate or tear down MLO associations and EAPOL exchanges to hit the narrow window where link_conf/link_sta are NULL during TX, reliably leaking tokens without depending on uncontrollable system state.\nPR:N - Exploitation requires only an unauthenticated adjacent WiFi peer initiating or disrupting MLO WPA handshakes that cause EAPOL transmission; no local account, capability, or init-namespace root access is needed on the victim.\nUI:N - No victim user action such as opening files or clicking prompts is required; the attacker alone can generate the authentication traffic needed to reach the vulnerable EAPOL TX path.\nS:U - Impact is confined to the kernel wireless subsystem on the affected host (token exhaustion and potential memory corruption); it does not cross VM, container, or IOMMU security boundaries.\nC:H - Leaked tokens leave stale idr entries pointing at txwi_cache structures that dma.c returns to the free pool, enabling reuse of the same cache while orphaned entries retain dangling skb pointers that can be dereferenced on later token operations.\nI:H - Reusing txwi_cache buffers still referenced by leaked token IDs can corrupt in-flight TX metadata and skb associations, providing a plausible path to controlled memory corruption and kernel code execution beyond simple resource loss.\nA:H - Each leak permanently consumes one of 16384 TX tokens; sustained triggering exhausts the pool, invokes __mt76_set_tx_blocked(), and halts all wireless transmission on the interface, constituting a repeatable denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:45:53.522Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/06e65d6cf80490bc0457d339595d1ed5a89e8899"
        },
        {
          "url": "https://git.kernel.org/stable/c/fa0e9aa92a7bc97fc42014c5efaaf1278fa92723"
        },
        {
          "url": "https://git.kernel.org/stable/c/831074096d0450308357271fc0ffd3f600a2487e"
        }
      ],
      "title": "wifi: mt76: mt7996: Fix possible token leak in mt7996_tx_prepare_skb()",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74323",
    "datePublished": "2026-08-15T05:58:18.857Z",
    "dateReserved": "2026-08-15T05:44:03.884Z",
    "dateUpdated": "2026-08-17T05:45:53.522Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-05",
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      "percentile": "0.14849"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T17:18:53+00:00",
      "cve": "CVE-2026-74323",
      "id": "CVE-2026-74323",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: wifi: mt76: mt7996: Fix possible token leak in mt7996_tx_prepare_skb()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74323.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.
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  • 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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