{"api_version":"1","generated_at":"2026-08-24T03:29:00+00:00","cve":"CVE-2026-68194","urls":{"html":"https://cve.report/CVE-2026-68194","api":"https://cve.report/api/cve/CVE-2026-68194.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68194","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68194"},"summary":{"title":"wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses","description":"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->tx_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\").","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-10 13:20:06","updated_at":"2026-08-19 17:20:35"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6","name":"https://git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6","name":"https://git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71","name":"https://git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b","name":"https://git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32","name":"https://git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/7003a2cbddd7917933c1f169c7874cfa6ab852c3","name":"https://git.kernel.org/stable/c/7003a2cbddd7917933c1f169c7874cfa6ab852c3","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-68194","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68194","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 48fab5bbef4092d925ab3214773ad12e68807223 7003a2cbddd7917933c1f169c7874cfa6ab852c3 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 48fab5bbef4092d925ab3214773ad12e68807223 ef2ee5f820c3ef87643b51e960c20b4a14d8336b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 48fab5bbef4092d925ab3214773ad12e68807223 ecf995b828191829ba4a87169bccabcbeb5c9c32 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 48fab5bbef4092d925ab3214773ad12e68807223 263816e92e8d66c81c98ccab2b5d2191ed08ec71 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 48fab5bbef4092d925ab3214773ad12e68807223 24475d2ddc8d8dfd82f4d2be0d951401f86911a6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 48fab5bbef4092d925ab3214773ad12e68807223 da4082e91acabc1498611ed8ccc53f0610baefc6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.16","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.148 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.101 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.42 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.6 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"68194","cve":"CVE-2026-68194","epss":"0.002000000","percentile":"0.101910000","score_date":"2026-08-19","updated_at":"2026-08-20 00:13:09"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/net/wireless/mediatek/mt76/mt7921/mac.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"7003a2cbddd7917933c1f169c7874cfa6ab852c3","status":"affected","version":"48fab5bbef4092d925ab3214773ad12e68807223","versionType":"git"},{"lessThan":"ef2ee5f820c3ef87643b51e960c20b4a14d8336b","status":"affected","version":"48fab5bbef4092d925ab3214773ad12e68807223","versionType":"git"},{"lessThan":"ecf995b828191829ba4a87169bccabcbeb5c9c32","status":"affected","version":"48fab5bbef4092d925ab3214773ad12e68807223","versionType":"git"},{"lessThan":"263816e92e8d66c81c98ccab2b5d2191ed08ec71","status":"affected","version":"48fab5bbef4092d925ab3214773ad12e68807223","versionType":"git"},{"lessThan":"24475d2ddc8d8dfd82f4d2be0d951401f86911a6","status":"affected","version":"48fab5bbef4092d925ab3214773ad12e68807223","versionType":"git"},{"lessThan":"da4082e91acabc1498611ed8ccc53f0610baefc6","status":"affected","version":"48fab5bbef4092d925ab3214773ad12e68807223","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/net/wireless/mediatek/mt76/mt7921/mac.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.16"},{"lessThan":"5.16","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.183","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.148","versionType":"semver"},{"lessThanOrEqual":"6.12.*","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":"6.1.183","versionStartIncluding":"5.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.148","versionStartIncluding":"5.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.101","versionStartIncluding":"5.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.42","versionStartIncluding":"5.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.6","versionStartIncluding":"5.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"5.16","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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->tx_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\")."}],"providerMetadata":{"dateUpdated":"2026-08-19T16:31:09.017Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/7003a2cbddd7917933c1f169c7874cfa6ab852c3"},{"url":"https://git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b"},{"url":"https://git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32"},{"url":"https://git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71"},{"url":"https://git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6"},{"url":"https://git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6"}],"title":"wifi: mt76: mt7921: 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-2026-68194","datePublished":"2026-08-10T12:00:12.245Z","dateReserved":"2026-07-30T09:28:09.374Z","dateUpdated":"2026-08-19T16:31:09.017Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-10 13:20:06","lastModifiedDate":"2026-08-19 17:20:35","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"68194","Ordinal":"1","Title":"wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses","CVE":"CVE-2026-68194","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68194","Ordinal":"1","NoteData":"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->tx_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\").","Type":"Description","Title":"wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses"}]}}}