High 8.2Published Sep 29, 2026

CVE-2026-71971U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly

Updated under an hour ago (Oct 26, 2026, 5:50 PM ET)

Does this affect you?

It affects u-boot. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.38%, higher than 29% of scored CVEs.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for u-boot

Exploited in the last 30 days

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.

CVSS: 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Weakness (CWE): CWE-787
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.38% (percentile 29)
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Sep 30, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

u-boot u-boot u_boot:u_boot (from the name)	before 2026.10-rc3	CNA record

References

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.