CVE-2026-71971CWE-787

CVE-2026-71971

High · published September 30, 2026

CVSS v3.1
8.2
EPSS
0%
Percentile
30.3
In the wild
Unconfirmed
What it is

U-Boot before 2026.10-rc3 with CONFIG_IP_DEFRAG enabled contains an out-of-bounds write vulnerability in the __net_defragment() function in net/net.c. Remote attackers can send a crafted IP fragment with non-zero offset and More-Fragments flag set during netboot to corrupt adjacent 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
0.00375 · 30.3th percentile
Weakness
CWE-787 · Out-of-bounds Write
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/net.c#L975 · [email protected]https://github.com/u-boot/u-boot/commit/04ca915d5bf39dda5d1bce62d04d2b59d293c5b9 · [email protected]https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc3-out-of-bounds-write-in-ip-fragment-reassembly · [email protected]
EPSS history
Timeline
  • 01 OCT 03:49Z
    EPSS moved — → 0%
    epss
  • 29 SEP 21:29Z
    U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly
    cvelistv5