CVE-2026-21378
Published: 06 April 2026
Summary
CVE-2026-21378 is a high-severity Buffer Over-read (CWE-126) vulnerability in Qualcomm Fastconnect 6900 Firmware. Its CVSS base score is 7.8 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 3.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Deeper analysis
CVE-2026-21378 is a memory corruption vulnerability stemming from a failure to validate the size of an output buffer during IOCTL processing in a camera sensor driver. This issue, classified under CWE-126 (Buffer Over-read), affects Qualcomm camera sensor drivers and was published on April 6, 2026, with a CVSS v3.1 base score of 7.8 (High).
The vulnerability can be exploited by a local attacker with low privileges, requiring low attack complexity and no user interaction. Successful exploitation grants high impacts on confidentiality, integrity, and availability, potentially allowing arbitrary code execution, data tampering, or system crashes within the affected driver context.
Qualcomm's April 2026 security bulletin at https://docs.qualcomm.com/product/publicresources/securitybulletin/april-2026-bulletin.html provides details on affected products and recommended patches or mitigations for this vulnerability.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-19334
Vulnerability details
Memory Corruption when accessing an output buffer without validating its size during IOCTL processing in a camera sensor driver.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Local memory corruption in kernel driver (IOCTL) directly enables exploitation for privilege escalation to arbitrary code execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Flaw remediation directly addresses the vulnerability by identifying, patching, and deploying fixes for the buffer size validation failure in the camera sensor driver as recommended in Qualcomm's bulletin.
Information input validation enforces checks on IOCTL parameters, such as output buffer sizes, preventing the memory corruption from unvalidated access.
Memory protection mechanisms like address space layout randomization and data execution prevention mitigate exploitation of the buffer over-read for arbitrary code execution or crashes.