Time-of-check Time-of-use (TOCTOU) Race Condition in MediaTek products - CVE-2026-20454
Published: June 1, 2026
Vulnerability identifier: #VU133129
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-20454
CWE-ID: CWE-367
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: MediaTek
Affected software:
MT8768
MT6899
MT6983
MT6985
MT6989
MT6991
MT8673
MT8765
MT8766
MT6897
MT8781
MT8786
MT8788
MT8791T
MT8793
MT8798
MT8910
MT6761
MT6765
MT6768
MT6789
MT6835
MT6855
MT6739
MT6878
MT6879
MT6886
MT6895
MT8797
MT6877
MT6781
MT6853
MT6883
MT6885
MT6889
MT6893
MT8768
MT6899
MT6983
MT6985
MT6989
MT6991
MT8673
MT8765
MT8766
MT6897
MT8781
MT8786
MT8788
MT8791T
MT8793
MT8798
MT8910
MT6761
MT6765
MT6768
MT6789
MT6835
MT6855
MT6739
MT6878
MT6879
MT6886
MT6895
MT8797
MT6877
MT6781
MT6853
MT6883
MT6885
MT6889
MT6893
Detailed vulnerability description
The vulnerability allows a local user to cause memory corruption.
The vulnerability exists due to time-of-check time-of-use race condition in geniezone when concurrent operations trigger the vulnerable condition. A local user can trigger a race condition to cause memory corruption.
How to mitigate CVE-2026-20454
Install security update from vendor's website.