CVE-2026-74222
U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callback
- State
- Published
- Severity
- 8.8 High
- Published
- Sep 29, 2026
- Updated
- Oct 2, 2026
- Reserved
- Aug 14, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.8 High | 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 | VulnCheck |
| 3.1 | 8.2 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H | VulnCheck |
Weaknesses
- CWE-416 Use After Free
Affected Products
| Product | Versions |
|---|---|
u-bootu-boot |
|
References
- https://github.com/u-boot/u-boot/commit/2d94618a58aeb7630f18eee33419ce48d0fd3616patch
- https://github.com/u-boot/u-boot/blob/v2026.07/net/lwip/wget.c#L194technical-description
- https://github.com/u-boot/u-bootproduct
- VulnCheck Advisory: U-Boot before 2026.10-rc5 Use-After-Free in lwIP wget Receive Callbackthird-party-advisory
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