U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback

Advisories

U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback

severity: high
date: 9/29/2026
Affecting: u-boot >= 0, < 2026.10-rc5
CVE: CVE-2026-74222
CWE: CWE-416 Use After Free
CVSS: 8.8
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
References: https://github.com/u-boot/u-boot/commit/2d94618a58aeb7630f18eee33419ce48d0fd3616
https://github.com/u-boot/u-boot/blob/v2026.07/net/lwip/wget.c#L194
https://github.com/u-boot/u-boot
Credit: Shahriyar Jalayeri (ByteRay Ltd.), Mehrun P. Hunter (ByteRay Ltd.)
Description: U-Boot before 2026.10-rc5 contains a use-after-free vulnerability in the httpc_recv_cb() function within the lwIP wget implementation. When HTTP data storage fails, the callback frees the connection PCB but returns ERR_BUF instead of ERR_ABRT, causing the TCP input path to access released memory and crash the bootloader.

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