CVE-2026-68194
wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses PKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7921_rx_check() and mt7921_queue_rx_skb() dispatch it to mt7921_mac_tx_free() on every bus. mt7921_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 and SDIO 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: mt7921_mac_tx_free+0x64/0x310 [mt7921_common] mt7921_rx_check+0x5f/0xf0 [mt7921_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").
INFO
Published Date :
Aug. 10, 2026, 1:20 p.m.
Last Modified :
Aug. 17, 2026, 5:18 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to the latest version.
- Apply the provided patch to fix the NULL pointer dereference.
- Ensure the driver is configured correctly for the bus type.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-68194.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-68194 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-68194
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-68194 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-68194 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': 'ef2ee5f820c3ef87643b51e960c20b4a14d8336b', 'versionType': 'git'}, {'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': 'ecf995b828191829ba4a87169bccabcbeb5c9c32', 'versionType': 'git'}, {'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': '263816e92e8d66c81c98ccab2b5d2191ed08ec71', 'versionType': 'git'}, {'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': '24475d2ddc8d8dfd82f4d2be0d951401f86911a6', 'versionType': 'git'}, {'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': 'da4082e91acabc1498611ed8ccc53f0610baefc6', 'versionType': 'git'}], 'programFiles': ['drivers/net/wireless/mediatek/mt76/mt7921/mac.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/mediatek/mt76/mt7921/mac.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': 'ef2ee5f820c3ef87643b51e960c20b4a14d8336b', 'versionType': 'git'}, {'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': 'ecf995b828191829ba4a87169bccabcbeb5c9c32', 'versionType': 'git'}, {'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': '263816e92e8d66c81c98ccab2b5d2191ed08ec71', 'versionType': 'git'}, {'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': '24475d2ddc8d8dfd82f4d2be0d951401f86911a6', 'versionType': 'git'}, {'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': 'da4082e91acabc1498611ed8ccc53f0610baefc6', 'versionType': 'git'}], 'programFiles': ['drivers/net/wireless/mediatek/mt76/mt7921/mac.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/mediatek/mt76/mt7921/mac.c'], 'defaultStatus': 'affected'}] -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 10, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': 'ef2ee5f820c3ef87643b51e960c20b4a14d8336b', 'versionType': 'git'}, {'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': 'ecf995b828191829ba4a87169bccabcbeb5c9c32', 'versionType': 'git'}, {'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': '263816e92e8d66c81c98ccab2b5d2191ed08ec71', 'versionType': 'git'}, {'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': '24475d2ddc8d8dfd82f4d2be0d951401f86911a6', 'versionType': 'git'}, {'status': 'affected', 'version': '48fab5bbef4092d925ab3214773ad12e68807223', 'lessThan': 'da4082e91acabc1498611ed8ccc53f0610baefc6', 'versionType': 'git'}], 'programFiles': ['drivers/net/wireless/mediatek/mt76/mt7921/mac.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '5.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '5.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.148', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.101', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.42', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.6', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc5', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/wireless/mediatek/mt76/mt7921/mac.c'], 'defaultStatus': 'affected'}] Added Description In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses PKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7921_rx_check() and mt7921_queue_rx_skb() dispatch it to mt7921_mac_tx_free() on every bus. mt7921_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 and SDIO 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: mt7921_mac_tx_free+0x64/0x310 [mt7921_common] mt7921_rx_check+0x5f/0xf0 [mt7921_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"). Added Reference https://git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6 Added Reference https://git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71 Added Reference https://git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6 Added Reference https://git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32 Added Reference https://git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b