U-Boot up to 2026.10-rc4 DHCPv6 dhcp6_parse_options SERVERID/CLIENTID out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k1.40

Summaryinfo

A vulnerability marked as critical has been reported in U-Boot up to 2026.10-rc4. Affected by this vulnerability is the function dhcp6_parse_options of the component DHCPv6. Performing a manipulation of the argument SERVERID/CLIENTID results in out-of-bounds. This vulnerability is reported as CVE-2026-74225. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in U-Boot up to 2026.10-rc4. This affects the function dhcp6_parse_options of the component DHCPv6. The manipulation of the argument SERVERID/CLIENTID with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-74225 since 08/14/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2026.10-rc5 eliminates this vulnerability.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.1
CNA Vector (VulnCheck): 🔒

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: U-Boot 2026.10-rc5

Timelineinfo

08/14/2026 CVE reserved
09/29/2026 +46 days Advisory disclosed
09/29/2026 +0 days VulDB entry created
09/29/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-74225 (🔒)
GCVE (CVE): GCVE-0-2026-74225
GCVE (VulDB): GCVE-100-411807

Entryinfo

Created: 09/29/2026 23:47
Changes: 09/29/2026 23:47 (77)
Complete: 🔍
Cache ID: 216::103

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