CVE-2026-74221

EUVD-2026-89434
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.
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: 27.76%
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#L643
https://github.com/u-boot/u-boot/commit/1c0aff3a5fbfeee7a8948f624e0b8554e6e0d8fd
https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-readlink