CyberRota Analysis
AI-GeneratedThe vulnerability affects the U-Boot bootloader, specifically in the tcp_rx_state_machine() function, where an integer underflow can be exploited by a network-adjacent attacker. By sending a specially crafted TCP SYN+ACK packet, the attacker can trigger a crash of the bootloader, potentially leading to device boot failure and memory corruption if certain configurations are disabled. Organizations utilizing U-Boot in their embedded systems should prioritize patching this vulnerability to mitigate the risk of denial-of-service attacks and ensure system stability.
Original NVD Description
U-Boot through 2026.04-rc3 contains an integer underflow vulnerability in the tcp_rx_state_machine() function (net/tcp.c) that allows a network-adjacent attacker to crash the bootloader by sending a malformed TCP SYN+ACK packet with a manipulated data offset field causing payload_len to become negative. When the TCP_SYN_SENT handler calls tcp_rx_user_data() without invoking tcp_seg_in_wnd() validation, the negative payload_len is implicitly converted to a large unsigned integer (e.g., 0xFFFFFFD8) and passed to memcpy() in store_block(), causing an immediate crash that prevents device boot and may enable memory corruption when CONFIG_LMB is disabled.
Related CVEs
Other vulnerabilities affecting the same vendor(s)