MediaTek MT8911 out-of-bounds write

Summaryinfo

A vulnerability identified as very critical has been detected in MediaTek MT6739, MT6761, MT6765, MT6768, MT6781, MT6789, MT6833, MT6835, MT6853, MT6855, MT6858, MT6877, MT6878, MT6879, MT6883, MT6885, MT6886, MT6889, MT6893, MT6895, MT6897, MT6899, MT6983, MT6985, MT6989, MT6991, MT6993, MT8168, MT8188, MT8189, MT8321, MT8385, MT8696, MT8765, MT8766, MT8768, MT8771, MT8781, MT8786, MT8788, MT8791T, MT8793, MT8797, MT8798, MT8875, MT8910 and MT8911. Impacted is an unknown function. Performing a manipulation results in out-of-bounds write. This vulnerability was named CVE-2026-20595. The attack needs to be approached locally. There is no available exploit. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability, which was classified as very critical, was found in MediaTek MT6739, MT6761, MT6765, MT6768, MT6781, MT6789, MT6833, MT6835, MT6853, MT6855, MT6858, MT6877, MT6878, MT6879, MT6883, MT6885, MT6886, MT6889, MT6893, MT6895, MT6897, MT6899, MT6983, MT6985, MT6989, MT6991, MT6993, MT8168, MT8188, MT8189, MT8321, MT8385, MT8696, MT8765, MT8766, MT8768, MT8771, MT8781, MT8786, MT8788, MT8791T, MT8793, MT8797, MT8798, MT8875, MT8910 and MT8911. This affects some unknown functionality. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In neuropilot, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege if a malicious actor has already obtained the System privilege. User interaction is not needed for exploitation. Patch ID: ALPS11263078; Issue ID: MSV-9001.

The advisory is shared at mediatek.com. This vulnerability is uniquely identified as CVE-2026-20595 since 11/03/2025. The exploitability is told to be easy. An attack has to be approached locally. Additional levels of successful authentication are necessary for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/02/2026).

Applying the patch ALPS11263078 is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-115055). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Chip Software

Vendor

• MediaTek

Name

• MT6739
• MT6761
• MT6765
• MT6768
• MT6781
• MT6789
• MT6833
• MT6835
• MT6853
• MT6855
• MT6858
• MT6877
• MT6878
• MT6879
• MT6883
• MT6885
• MT6886
• MT6889
• MT6893
• MT6895
• MT6897
• MT6899
• MT6983
• MT6985
• MT6989
• MT6991
• MT6993
• MT8168
• MT8188
• MT8189
• MT8321
• MT8385
• MT8696
• MT8765
• MT8766
• MT8768
• MT8771
• MT8781
• MT8786
• MT8788
• MT8791T
• MT8793
• MT8797
• MT8798
• MT8875
• MT8910
• MT8911

License

• commercial

CPE 2.3info

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CPE 2.2info

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CVSSv4info

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Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

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Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion