Vulnerability in U-Boot
CVE-2026-74221
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/u-boot/u-boot/commit/1c0aff3a5fbfeee7a8948f624e0b8554e6e0d8fd (patch)
- github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c (technical-description)
- github.com/u-boot/u-boot (product)
- www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-74221?
- CVE-2026-74221 is a high-severity vulnerability in U-Boot, classified under CWE-195. CVSS score: 8.2/10. Published 2026-09-29.
- How severe is CVE-2026-74221?
- High severity. CVSS v3 base score is 8.2 out of 10.