CVE-2026-71973: U-Boot

Medium severity, CVSS 5.2. EPSS: 0.2% chance of exploitation in the next 30 days.

U-Boot before 2026.10-rc4 contains an integer overflow vulnerability in sqfs_read_directory_table() function when allocating the directory table buffer. Attackers can supply a crafted SquashFS image with an attacker-controlled superblock metablks_count value that causes heap buffer under-allocation and out-of-bounds writes, corrupting heap memory and crashing the bootloader.

Affected products

• U-Boot U-Boot: before 2026.10-rc4 (fixed in 2026.10-rc4)

Published 2026-09-29. Last modified 2026-10-02.