{"id":"CVE-2026-68194","summary":"wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses\n\nPKT_TYPE_TXRX_NOTIFY is an mmio-only event, but mt7921_rx_check() and\nmt7921_queue_rx_skb() dispatch it to mt7921_mac_tx_free() on every bus.\nmt7921_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 and SDIO it is NULL, so\na TXRX_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   mt7921_mac_tx_free+0x64/0x310 [mt7921_common]\n   mt7921_rx_check+0x5f/0xf0 [mt7921_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\").","modified":"2026-08-21T03:30:27.214991956Z","published":"2026-08-10T12:00:12.245Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68194.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7003a2cbddd7917933c1f169c7874cfa6ab852c3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68194.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68194"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"48fab5bbef4092d925ab3214773ad12e68807223"},{"fixed":"7003a2cbddd7917933c1f169c7874cfa6ab852c3"},{"fixed":"ef2ee5f820c3ef87643b51e960c20b4a14d8336b"},{"fixed":"ecf995b828191829ba4a87169bccabcbeb5c9c32"},{"fixed":"263816e92e8d66c81c98ccab2b5d2191ed08ec71"},{"fixed":"24475d2ddc8d8dfd82f4d2be0d951401f86911a6"},{"fixed":"da4082e91acabc1498611ed8ccc53f0610baefc6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68194.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-68194.json"}}],"schema_version":"1.9.0"}