CVE-2026-74220

EUVD-2026-89433
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.2 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 27.13%
Debian logo
Debian Releases
Debian Product
Codename
u-boot
bookworm
vulnerable
bookworm (security)
vulnerable
forky
vulnerable
sid
vulnerable
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
u-boot
bionic
Fixed in 2020.10+dfsg-1ubuntu0~18.04.3+esm2
released
focal
Fixed in 2021.01+dfsg-3ubuntu0~20.04.6+esm2
released
jammy
Fixed in 2022.01+dfsg-2ubuntu2.9
released
noble
Fixed in 2025.10-0ubuntu0.24.04.4
released
resolute
Fixed in 2025.10-0ubuntu2.2
released
stonking
Fixed in 2025.10-0ubuntu6
released
xenial
Fixed in 2016.01+dfsg1-2ubuntu5+esm2
released
u-boot-nezha
jammy
needs-triage
noble
needs-triage
resolute
dne
stonking
dne
Common Weakness Enumeration
References
https://github.com/u-boot/u-boot
https://github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c#L695
https://github.com/u-boot/u-boot/commit/0bbf09859658b8cc9ac13be41af23b516b8ef69a
https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-read-reply