CVE-2026-68194

System crash via non-MMIO TXRX_NOTIFY dispatch

Published Aug 10, 2026 · Updated Aug 10, 2026

NULL pointer dereference in the Linux mt7921 Wi-Fi driver allows local users to crash systems that use USB or SDIO adapters. The mt7921_rx_check() and mt7921_queue_rx_skb() paths send an MMIO-only TXRX_NOTIFY event to mt7921_mac_tx_free() on every bus, reaching a NULL tx_cleanup callback on USB and SDIO. Reachability requires an affected kernel with mt7921 USB or SDIO Wi-Fi in use; processing the event in the RX worker dereferences the NULL pointer and crashes the system.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux mt7921 Wi-Fi driver allows local users to crash systems that use USB or SDIO adapters. The mt7921_rx_check() and mt7921_queue_rx_skb() paths send an MMIO-only TXRX_NOTIFY event to mt7921_mac_tx_free() on every bus, reaching a NULL tx_cleanup callback on USB and SDIO. Reachability requires an affected kernel with mt7921 USB or SDIO Wi-Fi in use; processing the event in the RX worker dereferences the NULL pointer and crashes the system.

The record

CVE
CVE-2026-68194
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=48fab5bbef4092d925ab3214773ad12e68807223 <24475d2ddc8d8dfd82f4d2be0d951401f86911a6
  2. Affected versionversion=48fab5bbef4092d925ab3214773ad12e68807223 <263816e92e8d66c81c98ccab2b5d2191ed08ec71
  3. Affected versionversion=48fab5bbef4092d925ab3214773ad12e68807223 <da4082e91acabc1498611ed8ccc53f0610baefc6
  4. Affected versionversion=48fab5bbef4092d925ab3214773ad12e68807223 <ecf995b828191829ba4a87169bccabcbeb5c9c32
  5. Affected versionversion=48fab5bbef4092d925ab3214773ad12e68807223 <ef2ee5f820c3ef87643b51e960c20b4a14d8336b
  6. Affected versionversion=5.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=48fab5bbef4092d925ab3214773ad12e68807223 <24475d2ddc8d8dfd82f4d2be0d951401f86911a6; version=48fab5bbef4092d925ab3214773ad12e68807223 <263816e92e8d66c81c98ccab2b5d2191ed08ec71; version=48fab5bbef4092d925ab3214773ad12e68807223 <da4082e91acabc1498611ed8ccc53f0610baefc6; version=48fab5bbef4092d925ab3214773ad12e68807223 <ecf995b828191829ba4a87169bccabcbeb5c9c32; version=48fab5bbef4092d925ab3214773ad12e68807223 <ef2ee5f820c3ef87643b51e960c20b4a14d8336b; version=5.16

Published CVSS scores

6.2Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5OracleCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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