MediaTek MT6858/MT6881/MT6993/MT8668 SurfaceFlinger use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.8$0-$5k2.67-

Summaryinfo

A vulnerability marked as very critical has been reported in MediaTek MT6858, MT6881, MT6993 and MT8668. This vulnerability affects unknown code of the component SurfaceFlinger. Performing a manipulation results in use after free. This vulnerability is identified as CVE-2026-20511. The attack is only possible with local access. There is not any exploit available.

Detailsinfo

A vulnerability classified as very critical has been found in MediaTek MT6858, MT6881, MT6993 and MT8668 (the affected version is unknown). This affects an unknown code of the component SurfaceFlinger. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In SurfaceFlinger, there is a possible memory corruption due to use after free. 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: ALPS11123860; Issue ID: MSV-8890.

The advisory is shared at mediatek.com. This vulnerability is uniquely identified as CVE-2026-20511 since 11/03/2025. The exploitability is told to be easy. An attack has to be approached locally. The exploitation needs additional levels of successful authentication. 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 09/07/2026).

Applying the patch ALPS11123860 is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-72204). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.2
VulDB Meta Temp Score: 7.8

VulDB Base Score: 8.2
VulDB Temp Score: 7.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: ALPS11123860

Timelineinfo

11/03/2025 CVE reserved
09/07/2026 +307 days Advisory disclosed
09/07/2026 +0 days VulDB entry created
09/07/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: mediatek.com
Status: Confirmed

CVE: CVE-2026-20511 (🔒)
GCVE (CVE): GCVE-0-2026-20511
GCVE (VulDB): GCVE-100-399501
EUVD: 🔒

Entryinfo

Created: 09/07/2026 04:17
Updated: 09/07/2026 13:32
Changes: 09/07/2026 04:17 (54), 09/07/2026 13:32 (1)
Complete: 🔍
Cache ID: 216::103

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