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CVE-2026-74225— U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6

Quick assessment

Affected
u-boot u-boot
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 ne

CVSS 7.1 · High
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I. Basic Information for CVE-2026-74225

Vulnerability Information

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Vulnerability Title
U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
u-boot u-boot 0 ~ 2026.10-rc5 -

II. Public POCs for CVE-2026-74225

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III. Intelligence Information for CVE-2026-74225

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Other References for CVE-2026-74225 (4)

Same Patch Batch · u-boot · 2026-09-29 · 8 CVEs total

CVE-2026-74222 8.2 HIGH U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback
CVE-2026-74221 8.2 HIGH U-Boot before 2026.10-rc5 Buffer Overflow via NFS READLINK
CVE-2026-74220 8.2 HIGH U-Boot before 2026.10-rc5 Buffer Overflow via NFS READ Reply
CVE-2026-71971 8.2 HIGH U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly
CVE-2026-71972 5.9 MEDIUM U-Boot through 2026.10-rc5 Out-of-Bounds Write in BMP RLE8 Decoder
CVE-2026-71973 5.2 MEDIUM U-Boot before 2026.10-rc4 Integer Overflow in SquashFS Directory Table Allocation
CVE-2026-71974 4.8 MEDIUM U-Boot before 2026.10-rc3 Out-of-Bounds Write via Android Bootmeth Partition Read

IV. Related Vulnerabilities

Same product: u-boot
Same vendor: u-boot
Same weakness: CWE-787

V. Comments for CVE-2026-74225

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