CVE-2026-71971

HIGH 8.2

U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly

CVSS Score

8.2

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-787
Vendor	u-boot
Product	u-boot
Published	Sep 29, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

High

Affected Versions

u-boot / u-boot

0 < 2026.10-rc3

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/u-boot/u-boot/commit/04ca915d5bf39dda5d1bce62d04d2b59d293c5b9 github.com: https://github.com/u-boot/u-boot/blob/v2026.07/net/net.c#L975 github.com: https://github.com/u-boot/u-boot vulncheck.com: https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc3-out-of-bounds-write-in-ip-fragment-reassembly

Credits

Shahriyar Jalayeri (ByteRay Ltd.) Mehrun P. Hunter (ByteRay Ltd.)