MediaTek MT6991/MT6993/MT8678 pcie out-of-bounds write

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in MediaTek MT6991, MT6993 and MT8678. This affects an unknown function of the component pcie. Executing a manipulation can lead to out-of-bounds write. The identification of this vulnerability is CVE-2026-20417. The attack can only be executed locally. There is no exploit available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability has been found in MediaTek MT6991, MT6993 and MT8678 (version unknown) and classified as critical. This vulnerability affects an unknown function of the component pcie. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In pcie, 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: ALPS10314946 / ALPS10340155; Issue ID: MSV-5154.

The advisory is available at corp.mediatek.com. This vulnerability was named CVE-2026-20417 since 11/03/2025. The exploitation appears to be easy. Local access is required to approach this attack. The technical details are unknown and an exploit is not available.

Applying the patch ALPS10314946 is able to eliminate this problem.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

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Vendor

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License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.1

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
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: Out-of-bounds write
CWE: CWE-787 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

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: ALPS10314946

Timelineinfo

11/03/2025 CVE reserved
02/02/2026 +91 days Advisory disclosed
02/02/2026 +0 days VulDB entry created
02/02/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: MSV-5154
Status: Confirmed

CVE: CVE-2026-20417 (🔒)
GCVE (CVE): GCVE-0-2026-20417
GCVE (VulDB): GCVE-100-343714

Entryinfo

Created: 02/02/2026 10:24
Changes: 02/02/2026 10:24 (56)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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