vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2026-74225

U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6

HIGH
7.1
CVSS Score
Published: September 29, 2026 at 09:29 PM UTC
Updated: September 30, 2026 at 08:17 PM UTC
2 products affected across 2 vendorsU BootU Boot

Using u-boot by u-boot?

Get instant alerts when new vulnerabilities affect u-boot - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH7.1
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

U-Boot before 2026.10-rc5 contains out-of-bounds memory access in dhcp6_parse_options() that fails to validate SERVERID and CLIENTID option lengths from DHCPv6 packets. Attackers on the local network can send crafted DHCPv6 ADVERTISE or REPLY packets during netboot to corrupt memory and crash the bootloader.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

U Boot· Denx
95%
v < 2026.10-rc5
Affected range stops below 2026.10-rc5, so it looks safe — our inference, not a vendor statement
U Boot· U Boot
60%
v < 2026.10-rc5
Affected range stops below 2026.10-rc5, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (4)

Patch
Source: cverecord
https://github.com/u-boot/u-boot/commit/20209a62bc8565fc1e040882bc03c71ff0d73076
Technical Description
Source: cverecord
https://github.com/u-boot/u-boot/blob/v2026.07/net/dhcpv6.c#L304
Product
Source: cverecord
https://github.com/u-boot/u-boot
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-out-of-bounds-write-via-dhcpv6

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.1HIGHVulnCheck
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-787

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card