CVE Catalog

CVE-2026-91041

HighCVSS 7.8
Published: Updated: Translated: NVD NIST

Summary

Mounting an attacker-controlled FAT image with fault tolerance enabled causes an out-of-bounds heap write during log replay. The write is attacker-positioned and attacker-valued, and on a common embedded memory layout it reaches the FX_MEDIA driver callback, giving control of the instruction pointer.

Risk Assessment

An attacker can gain code execution on an embedded system by mounting a malicious FAT image, potentially leading to full device compromise.

Recommendation

Upgrade the FAT filesystem software to a patched version. Avoid mounting untrusted FAT images with fault tolerance enabled.

Related vulnerabilities

Original NVD description (English source)

Mounting an attacker-controlled FAT image with fault tolerance enabled causes an out-of-bounds heap write during log replay. The write is attacker-positioned and attacker-valued, and on a common embedded memory layout it reaches the FX_MEDIA driver callback, giving control of the instruction pointer.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS