Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Denx | U-Boot | < 2026.04 |
Related Weaknesses (CWE)
References
- https://lists.denx.de/pipermail/u-boot/2026-May/617853.htmlMailing ListThird Party Advisory
- https://u-boot.org/Product
- https://www.vulncheck.com/advisories/u-boot-rc3-out-of-bounds-read-in-tcp-rx-staThird Party AdvisoryExploit
- https://y637f9qq2x.com/posts/u-boot-tcp-nfs-vulns/Third Party AdvisoryExploit
FAQ
What is CVE-2026-29007?
CVE-2026-29007 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 boun...
How severe is CVE-2026-29007?
CVE-2026-29007 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-29007?
Check the references section above for vendor advisories and patch information. Affected products include: Denx U-Boot.