CVE-2026-29008

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>u-boot-tools</name>
	<range><lt>2026.04</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>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.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-29008</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-29008</url>
    </references>
    <dates>
      <discovery>2026-07-08</discovery>
      <entry>2026-10-26</entry>
    </dates>
  </vuln>