Name: CVE-2026-74220: Signed to Unsigned Conversion Error
Creator: Rapid7
Published: 2026-09-29T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-74220, CWE-195, CVSS 8.2, EPSS 0.00334

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.

CVSS Details

CVSS 4.0 Base Score: 8.8 (HIGH)
CVSS 4.0 Vector: (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
CVSS 3.1 Base Score: 8.2
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Ubuntu	—	Upgrade u-boot-qemu (Ubuntu Pro)Upgrade u-boot-toolsUpgrade u-boot-imx (Ubuntu Pro)Upgrade u-boot-tools (Ubuntu Pro)Upgrade u-boot-qemuUpgrade u-boot-imx	Oct 15, 2026	Oct 14, 2026

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CVSS Details

Covered by Rapid7

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