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High severity · published Sep 29, 2026
CVE-2026-74225
U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6
7.1
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
UB
u-boot · u-boot
before 2026.10-rc5 · source: vendor
Affected product
UB
u-boot
u-boot
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-74225
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-74225
patch
https://github.com/u-boot/u-boot/commit/20209a62bc8565fc1e040882bc03c71ff0d73076
technical-description
https://github.com/u-boot/u-boot/blob/v2026.07/net/dhcpv6.c#L304
product
https://github.com/u-boot/u-boot
third-party-advisory
https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-out-of-bounds-write-via-dhcpv6
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