Vulnerability in U-Boot
CVE-2026-74220
U-Boot before 2026.10-rc5 contains a buffer overflow in nfs_read_reply() function in net/nfs-common.c that allows attackers to corrupt memory by supplying crafted NFS READ reply lengths. A malicious NFS server can exploit signed integer handling to bypass length validation and write far past the destination buffer, crashing the bootloader or corrupting memory.
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/0bbf09859658b8cc9ac13be41af23b516b8ef69a (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-2026-74220?
- CVE-2026-74220 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-2026-74220?
- High severity. CVSS v3 base score is 8.2 out of 10.