CVE-2026-68194— wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses
Possible ATT&CK Techniques 1AI
T1068 · Exploitation for Privilege EscalationAffected Version Matrix 12
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 48fab5bbef4092d925ab3214773ad12e68807223< ef2ee5f820c3ef87643b51e960c20b4a14d8336b | affected |
48fab5bbef4092d925ab3214773ad12e68807223< ecf995b828191829ba4a87169bccabcbeb5c9c32 | affected | ||
48fab5bbef4092d925ab3214773ad12e68807223< 263816e92e8d66c81c98ccab2b5d2191ed08ec71 | affected | ||
48fab5bbef4092d925ab3214773ad12e68807223< 24475d2ddc8d8dfd82f4d2be0d951401f86911a6 | affected | ||
48fab5bbef4092d925ab3214773ad12e68807223< da4082e91acabc1498611ed8ccc53f0610baefc6 | affected | ||
5.16 | affected | ||
< 5.16 | unaffected | ||
6.6.148≤ 6.6.* | unaffected | ||
| … +4 more rows | |||
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I. Basic Information for CVE-2026-68194
Vulnerability Information
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Vulnerability Title
wifi: mt76: mt7921: drop TXRX_NOTIFY on non-mmio buses
Source: CVE Program / CVE List V5
Vulnerability 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").
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 5.16版本存在安全漏洞，该漏洞源于对非mmio总线上的TXRX_NOTIFY事件处理不当，在RX工作线程中触发空指针取消引用，可能导致拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-68194
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-68194 (5)
Same Patch Batch · Linux · 2026-08-10 · 345 CVEs total
| CVE-2026-68311 | wifi: mt76: mt7925: guard link STA in decap offload | |
| CVE-2026-68321 | net: txgbe: fix FDIR filter leak on remove | |
| CVE-2026-68320 | sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid | |
| CVE-2026-68319 | pds_core: fix deadlock between reset thread and remove | |
| CVE-2026-68318 | pds_core: fix use-after-free on workqueue during remove | |
| CVE-2026-68317 | pds_core: fix auxiliary device add/del races | |
| CVE-2026-68316 | accel: ethosu: Fix element size accounting for cmd stream validation | |
| CVE-2026-68315 | sctp: validate stream count in sctp_process_strreset_inreq() | |
| CVE-2026-68314 | net: mctp i3c: clean up notifier and buses if driver register fails | |
| CVE-2026-68313 | tipc: fix infinite loop in __tipc_nl_compat_dumpit | |
| CVE-2026-68312 | cifs: fix cifsFileInfo leak on kmalloc failure in deferred close drain paths | |
| CVE-2026-68306 | wifi: mt76: mt7996: fix possible NULL-pointer deref in mt7996_mcu_sta_bfer_eht() | |
| CVE-2026-68301 | net: hsr: fix memory leak on slave unregistration by removing synced VLANs | |
| CVE-2026-68302 | amt: re-read skb header pointers after every pull | |
| CVE-2026-68303 | drm/vc4: hvs/v3d: Fix null dereference in unbind | |
| CVE-2026-68304 | wifi: brcmfmac: fix 802.1X-SHA256 call trace warning | |
| CVE-2026-68305 | drm/xe/vf: Add drm_dev guards when detaching CCS read/write buffers | |
| CVE-2026-68308 | wifi: mt76: mt7996: check pointer returned by mt76_connac_get_he_phy_cap() | |
| CVE-2026-68310 | wifi: mt76: mt7915: guard HE capability lookups | |
| CVE-2026-68309 | wifi: mt76: connac: fix possible NULL-pointer deref in mt76_connac_mcu_uni_bss_he_tlv() |
Showing top 20 of 345 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-68454
KVM: s390: pci: Fix handling of AIF enable without AISB - CVE-2026-68453
s390/zcrypt: Fix buffer over-read in cca_cipher2protkey - CVE-2026-68452
s390/zcrypt: Validate length for CCA AES cipher key requests - CVE-2026-68451
s390/zcrypt: Validate length for CCA ECC private key request - CVE-2026-68450
btrfs: free mapping node on duplicate reloc root insert
Same vendor: Linux
- CVE-2026-68454
KVM: s390: pci: Fix handling of AIF enable without AISB - CVE-2026-68453
s390/zcrypt: Fix buffer over-read in cca_cipher2protkey - CVE-2026-68452
s390/zcrypt: Validate length for CCA AES cipher key requests - CVE-2026-68451
s390/zcrypt: Validate length for CCA ECC private key request - CVE-2026-68450
btrfs: free mapping node on duplicate reloc root insert
V. Comments for CVE-2026-68194
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