Medium severity · published Aug 3, 2026
CVE-2026-20493
In wifi, there is a possible out of bounds write due to a missing bounds check
4.4
CVSS
0.1%
EPSS
No
On KEV
Description
In wifi, there is a possible out of bounds write due to a missing bounds check. This could lead to local denial of service if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: BORA00154903; Issue ID: MSV-7575.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 4% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MC
MediaTek chipset · MediaTek, Inc.
MT6890; MT6988; MT6990 · source: vendor
MF
Mt6890 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt6988 Firmware · Mediatek
All versions, or not specified · source: NVD
MF
Mt6990 Firmware · Mediatek
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-20493
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-20493
Vendor Advisory
https://www.mediatek.com/product-security-bulletin/August-2026
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