CVE-2026-74221: U-Boot

High severity, CVSS 8.2. EPSS: 0.3% chance of exploitation in the next 30 days.

U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_readlink_reply() function in net/nfs-common.c when processing NFS server responses. A malicious NFS server can send crafted READLINK replies with negative or oversized symlink length values to corrupt memory and crash the bootloader.

Affected products

• U-Boot U-Boot: before 2026.10-rc5 (fixed in 2026.10-rc5)

Published 2026-09-29. Last modified 2026-09-30.