Is CVE-2026-74221 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-74221?

CVE-2026-74221 has a CVSS v3 severity of HIGH (8.2).

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CVE-2026-74221

Description

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.