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CVE-2026-29008 is an integer underflow in U-Boot through 2026.04-rc3 in the TCP receive state machine. A malformed TCP SYN+ACK packet with a manipulated TCP data-offset field can make the calculated payload length negative. In the TCP_SYN_SENT handling path, this value reaches tcp_rx_user_data() without prior segment-window validation. Its subsequent implicit conversion to an unsigned length causes a very large copy length to be supplied to memcpy() by store_block(), resulting in a bootloader crash. Memory corruption may also be possible in builds where CONFIG_LMB is disabled.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-reachable, low-complexity vulnerability with no required privileges or user interaction that can cause high availability impact.
An integer-underflow vulnerability in U-Boot/uboot-tools that can lead to denial of service. The referenced Fedora 45 security update includes uboot-tools 2026.10 RC4 and is pending testing.
An integer underflow vulnerability in U-Boot through 2026.04-rc3 in tcp_rx_state_machine() that can be triggered by a malformed TCP SYN+ACK packet, causing a bootloader crash and potentially memory corruption when CONFIG_LMB is disabled.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.