CVE-2026-68194

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68194", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.374Z", "datePublished": "2026-08-10T12:00:12.245Z", "dateUpdated": "2026-08-19T16:31:09.017Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:31:09.017Z"}, "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\")."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/mediatek/mt76/mt7921/mac.c"], "versions": [{"version": "48fab5bbef4092d925ab3214773ad12e68807223", "lessThan": "7003a2cbddd7917933c1f169c7874cfa6ab852c3", "status": "affected", "versionType": "git"}, {"version": "48fab5bbef4092d925ab3214773ad12e68807223", "lessThan": "ef2ee5f820c3ef87643b51e960c20b4a14d8336b", "status": "affected", "versionType": "git"}, {"version": "48fab5bbef4092d925ab3214773ad12e68807223", "lessThan": "ecf995b828191829ba4a87169bccabcbeb5c9c32", "status": "affected", "versionType": "git"}, {"version": "48fab5bbef4092d925ab3214773ad12e68807223", "lessThan": "263816e92e8d66c81c98ccab2b5d2191ed08ec71", "status": "affected", "versionType": "git"}, {"version": "48fab5bbef4092d925ab3214773ad12e68807223", "lessThan": "24475d2ddc8d8dfd82f4d2be0d951401f86911a6", "status": "affected", "versionType": "git"}, {"version": "48fab5bbef4092d925ab3214773ad12e68807223", "lessThan": "da4082e91acabc1498611ed8ccc53f0610baefc6", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/mediatek/mt76/mt7921/mac.c"], "versions": [{"version": "5.16", "status": "affected"}, {"version": "0", "lessThan": "5.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.6.148"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.12.101"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "7.2"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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\")."}], "id": "CVE-2026-68194", "lastModified": "2026-08-19T17:20:35.577", "metrics": {}, "published": "2026-08-10T13:20:06.783", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7003a2cbddd7917933c1f169c7874cfa6ab852c3"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux Kernel mt76 WiFi Driver: Denial of Service via NULL Pointer Dereference", "id": "2513247", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513247"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.8", "cvss3_scoring_vector": "CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nwifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses\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:\nBUG: kernel NULL pointer dereference, address: 0000000000000000\nRIP: 0010:0x0\nCall Trace:\nmt7921_mac_tx_free+0x64/0x310 [mt7921_common]\nmt7921_rx_check+0x5f/0xf0 [mt7921_common]\nmt76u_rx_worker+0x1b9/0x620 [mt76_usb]\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\").", "A flaw was found in the Linux kernel's mt76 WiFi driver. When the driver processes a `TXRX_NOTIFY` event on non-Memory-Mapped I/O (MMIO) buses, such as USB or SDIO, it attempts to call a null function pointer. This can lead to a kernel NULL pointer dereference, causing a system crash and resulting in a Denial of Service (DoS)."], "name": "CVE-2026-68194", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T12:00:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68194\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68194\nhttps://git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6\nhttps://git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71\nhttps://git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6\nhttps://git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32\nhttps://git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[48fab5bbef4092d925ab3214773ad12e68807223,ef2ee5f820c3ef87643b51e960c20b4a14d8336b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[48fab5bbef4092d925ab3214773ad12e68807223,ecf995b828191829ba4a87169bccabcbeb5c9c32)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[48fab5bbef4092d925ab3214773ad12e68807223,263816e92e8d66c81c98ccab2b5d2191ed08ec71)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[48fab5bbef4092d925ab3214773ad12e68807223,24475d2ddc8d8dfd82f4d2be0d951401f86911a6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[48fab5bbef4092d925ab3214773ad12e68807223,da4082e91acabc1498611ed8ccc53f0610baefc6)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T17:15:02.917816+00:00", "updated": "2026-08-13T07:30:06.735943+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}