Description
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.
Published: 2026-09-29
Score: 8.8 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 29 Sep 2026 21:45:00 +0000

Type Values Removed Values Added
Description 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.
Title U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly
First Time appeared Denx
Denx u-boot
Weaknesses CWE-787
CPEs cpe:2.3:a:denx:u-boot:*:*:*:*:*:*:*:*
Vendors & Products Denx
Denx u-boot
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H'}

cvssV4_0

{'score': 8.8, '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'}

Subscriptions

Denx U-boot
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-29T21:29:20.055Z

Reserved: 2026-08-08T16:43:04.178Z

Link: CVE-2026-71971

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-29T22:18:21.723

Modified: 2026-09-29T22:18:21.723

Link: CVE-2026-71971

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses