CVE-2026-74221CWE-195

CVE-2026-74221

High · published September 30, 2026

CVSS v3.1
8.2
EPSS
0%
Percentile
26.7
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.2 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CVSS v4.0
8.8 · 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
EPSS
0.00344 · 26.7th percentile
Weakness
CWE-195 · Signed to Unsigned Conversion Error
Published
2026-09-30T02:18Z
References (4)
https://github.com/u-boot/u-boot · [email protected]https://github.com/u-boot/u-boot/blob/v2026.07/net/nfs-common.c#L643 · [email protected]https://github.com/u-boot/u-boot/commit/1c0aff3a5fbfeee7a8948f624e0b8554e6e0d8fd · [email protected]https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-buffer-overflow-via-nfs-readlink · [email protected]
EPSS history
Timeline
  • 01 OCT 03:49Z
    EPSS moved — → 0%
    epss
  • 29 SEP 21:29Z
    U-Boot before 2026.10-rc5 Buffer Overflow via NFS READLINK
    cvelistv5