Out-of-bounds write in MediaTek products - CVE-2025-20798

Vulnerability identifier: #VU120889

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2025-20798

CWE-ID: CWE-787

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local application to perform service disruption.

The vulnerability exists due to a missing bounds check within battery. A local application can perform service disruption.

MT8788E
MT8391
MT8676
MT8678
MT8696
MT8766
MT8768
MT8781
MT8786
MT8367
MT8791T
MT8792
MT8793
MT8796
MT8873
MT8883
MT8893
MT6879
MT6765
MT6768
MT6833
MT6835
MT6855
MT2718
MT6985
MT6989
MT6991
MT8186
MT8188
MT8196
MT6781
MT6853
MT6877
MT6893
TB373FU Lenovo Idea Tab Pro
TB311FU/TB311XU Lenovo Tab with Clear Case/ Lenovo Tab with Folio Case
TB351FU Lenovo Tab Plus
TB350FU, TB350XU Lenovo Tab P11 Gen
TB350FU, TB350XU Lenovo Tab P11 2nd
TB305FUXU Lenovo Tab One/Lenovo Tab K9
TB330FUP, TB330XUP Lenovo Tab K11 Edition
TB330FUP, TB330XUP Lenovo Tab K11 Enhanced
TB570FU, TB570ZU Lenovo Tab Extreme
TB330FU/TB330XU Lenovo Tab B11/Lenovo Tab M11&K11
TB336FU/TB336ZU Lenovo Idea Tab/ Lenovo Tab K11 Gen 2
Lenovo Idea Tab Pro (TB373FU)
Lenovo Tab with Clear Case/ Lenovo Tab with Folio Case (TB311FU/TB311XU)
Lenovo Tab Plus (TB351FU)
Lenovo Tab P11 2nd Gen (TB350XU / TB350FU)
Lenovo Tab One/Lenovo Tab K9 (TB305FUXU)
Lenovo Tab K9 (TB305FU/TB305XU)
Lenovo Tab K11 (TB330FU/TB330FUP/TB330XU/TB330XUP)
Lenovo Tab Extreme (TB570ZU/TB570FU)
Lenovo Tab M11 (TB330FU/TB330XU)
Lenovo Idea Tab/ Lenovo Tab K11 Gen 2 (TB336FU/TB336ZU)

Install security update from vendor's website.

• https://corp.mediatek.com/product-security-bulletin/January-2026

• Multiple vulnerabilities in MediaTek chipsets
• Multiple vulnerabilities in Lenovo Mediatek tablets