CVE-2025-39787: 
Linux Kernel vulnerability analysis and mitigation

CVE-2025-39787 is a vulnerability discovered in the Linux kernel's MDT loader component, specifically in the soc: qcom: mdt_loader functionality. The vulnerability was disclosed on September 11, 2025. The issue affects various Linux kernel versions and distributions, particularly impacting systems using the Qualcomm MDT loader (NVD).

The vulnerability exists in the ELF header handling of the MDT loader. When the loader is used outside of remoteproc, where ELF header sanitization is typically performed, there is a potential for buffer overflow as the code iterates over the header. The issue specifically involves improper validation of ephentsize and eshentsize parameters, which could lead to incorrect step size calculations during header traversal (Ubuntu).

The vulnerability could allow an attacker to read past the end of the firmware buffer during header iteration, potentially leading to information disclosure or memory corruption. This affects systems using the Qualcomm MDT loader component in the Linux kernel (NVD).

The vulnerability has been addressed through a patch that implements proper validation of the firmware buffer size and adds checks for ephentsize and eshentsize values. The fix ensures that buffer boundaries are respected during header traversal. Multiple Linux distributions have begun rolling out updates to address this vulnerability (Ubuntu).