NULL pointer dereference in MediaTek products - CVE-2026-20457
Published: July 1, 2026
Vulnerability identifier: #VU136039
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-20457
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: MediaTek
Affected software:
MT8766R
MT6895
MT6896
MT6980
MT6983
MT6985
MT6989
MT6990
MT8666
MT8667
MT8673
MT8675
MT8765
MT8766
MT8768
MT8771
MT8781
MT8786
MT8788
MT8788E
MT8789
MT8791
MT8791T
MT8795T
MT8796
MT8798
MT8893
MT6789
MT2737
MT6739
MT6761
MT6762
MT6763
MT6765
MT6767
MT6768
MT6769
MT6771
MT6783
MT2735
MT6833
MT6855
MT6879
MT6880
MT6886
MT6890
MT6893
MT6891
MT8797
MT6779
MT6781
MT6785
MT6853
MT6873
MT6875
MT6877
MT6883
MT6885
MT6889
MT8766R
MT6895
MT6896
MT6980
MT6983
MT6985
MT6989
MT6990
MT8666
MT8667
MT8673
MT8675
MT8765
MT8766
MT8768
MT8771
MT8781
MT8786
MT8788
MT8788E
MT8789
MT8791
MT8791T
MT8795T
MT8796
MT8798
MT8893
MT6789
MT2737
MT6739
MT6761
MT6762
MT6763
MT6765
MT6767
MT6768
MT6769
MT6771
MT6783
MT2735
MT6833
MT6855
MT6879
MT6880
MT6886
MT6890
MT6893
MT6891
MT8797
MT6779
MT6781
MT6785
MT6853
MT6873
MT6875
MT6877
MT6883
MT6885
MT6889
Detailed vulnerability description
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper input validation in the modem when processing input. A local user can send crafted input to cause a denial of service.
How to mitigate CVE-2026-20457
Install security update from vendor's website.