CVE-2026-29007: Denx U-Boot

Medium severity, CVSS 5.3. EPSS: 0.7% chance of exploitation in the next 30 days.

U-Boot through 2026.04-rc3 contains an out-of-bounds read vulnerability in tcp_rx_state_machine() (net/tcp.c) when CONFIG_PROT_TCP is enabled, allowing remote attackers to read beyond TCP segment boundaries by crafting a malicious packet with a mismatched IP total length and TCP data offset field. Attackers can send a packet with an IP total length of 40 bytes and a TCP data offset claiming 60 bytes of header to cause tcp_parse_options() to read 40 bytes past the end of the TCP segment, potentially corrupting connection state variables such as rmt_win_scale and rmt_timestamp to disrupt TCP window calculations.

Affected products

• Denx U-Boot: before 2026.04 (fixed in 2026.04); version 2026.04 only

Published 2026-07-08. Last modified 2026-07-22.