CVE-2026-29007

NameCVE-2026-29007
DescriptionU-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.
SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs1142070

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
u-boot (PTS)bullseye2021.01+dfsg-5vulnerable
bullseye (security)2021.01+dfsg-5+deb11u3vulnerable
bookworm, bookworm (security)2023.01+dfsg-2+deb12u3vulnerable
trixie2025.01-3vulnerable
forky, sid2025.01-3.2vulnerable

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
u-bootsource(unstable)(unfixed)1142070

Notes

https://y637f9qq2x.com/posts/u-boot-tcp-nfs-vulns/
https://lists.denx.de/pipermail/u-boot/2026-May/617853.html

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