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Qualcomm Snapdragon EUVDEUVD-2026-41931

| CVE-2026-21384 MEDIUM
Out-of-bounds Write (CWE-787)
2026-07-06 qualcomm GHSA-wj36-3pgh-3jfq
5.3
CVSS 3.1 · NVD
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Severity by source

Vendor (qualcomm) PRIMARY
MEDIUM
qualitative
NVD
5.3 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
vuln.today AI
5.3 MEDIUM

User-space process must issue crafted firmware commands (AV:L, PR:L); specific invalid index conditions required (AC:H); firmware boundary crossing with partial cross-component impact supports S:C and C:L/I:L/A:L.

3.1 AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
4.0 AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L

Primary rating from Vendor (qualcomm).

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

1
Analysis Generated
Jul 06, 2026 - 22:07 vuln.today

DescriptionNVD

Memory Corruption when updating prepared commands with invalid port indices based on user space input exceeds supported read client limits.

AnalysisAI

Memory corruption in Qualcomm Snapdragon firmware triggers an out-of-bounds write (CWE-787) when prepared commands are updated using invalid port indices supplied from user space that exceed supported read client limits. The vulnerability spans an exceptionally broad portfolio of Snapdragon chipsets covering mobile, automotive, XR/AR, and connectivity platforms. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Gain low-privilege local execution on device
Delivery
Access firmware prepared-command interface via driver or HAL
Exploit
Submit command with out-of-bounds port index
Execution
Trigger out-of-bounds write in firmware memory
Persist
Corrupt adjacent firmware component
Impact
Achieve partial confidentiality, integrity, or availability impact across scope boundary

Vulnerability AssessmentAI

Exploitation Requires local code execution on the affected device with at least low-privilege user-space access capable of issuing prepared commands to the vulnerable firmware interface (e.g., via a kernel driver or HAL service). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD CVSS 3.1 score of 5.3 Medium with vector AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L reflects a constrained but noteworthy risk profile. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A malicious or compromised low-privilege application running on an affected Snapdragon device submits a prepared command to the relevant firmware interface with a crafted port index value exceeding the supported read client limits. The firmware fails to validate the index before writing to memory, triggering an out-of-bounds write that corrupts data in an adjacent firmware component - potentially enabling limited information disclosure, data manipulation, or stability impact across a scope boundary. …
Remediation Apply the firmware patches distributed through Qualcomm's July 2026 Security Bulletin at https://docs.qualcomm.com/product/publicresources/securitybulletin/july-2026-bulletin.html. … Detailed patch versions, workarounds, and compensating controls in full report.

Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-41931 vulnerability details – vuln.today

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