SB20260812351 - NULL pointer dereference in Linux kernel mt76 mt7921 driver
Published: August 12, 2026
Security Bulletin ID
SB20260812351
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) NULL pointer dereference (CVE-ID: CVE-2026-68194)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in mt7921_rx_check() and mt7921_queue_rx_skb() when handling PKT_TYPE_TXRX_NOTIFY events on non-mmio buses. A local user can trigger the vulnerable code path to cause a denial of service.
The issue affects USB and SDIO bus configurations because the tx_cleanup callback is NULL on those non-mmio buses.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/24475d2ddc8d8dfd82f4d2be0d951401f86911a6
- https://git.kernel.org/stable/c/263816e92e8d66c81c98ccab2b5d2191ed08ec71
- https://git.kernel.org/stable/c/da4082e91acabc1498611ed8ccc53f0610baefc6
- https://git.kernel.org/stable/c/ecf995b828191829ba4a87169bccabcbeb5c9c32
- https://git.kernel.org/stable/c/ef2ee5f820c3ef87643b51e960c20b4a14d8336b