Vulnerability in u-boot

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund29 Sep 2026WID-SEC-2026-3660

  DENX U-Boot: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-74221CVE-2026-74222CVE-2026-74220+5 more CVEs

[ References ]References

• github.com/u-boot/u-boot
• github.com/u-boot/u-boot/blob/v2026.07/net/lwip/wget.c
• github.com/u-boot/u-boot/commit/2d94618a58aeb7630f18eee33419ce48d0fd3616
• www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-use-after-free-in-lwip-wget-rece…