CVE-2026-71971 U-Boot - Denial of Service

U-Boot before 2026.10-rc3 with CONFIG_IP_DEFRAG enabled contains an out-of-bounds write caused by improper handling of crafted IP fragments in __net_defragment() function, letting remote attackers crash the bootloader via memory corruption, exploit requires network access during netboot.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.38% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Published
29 September 2026
Updated
15 October 2026
Weakness
CWE-787

Vendor fix

Update to version 2026.10-rc3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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