CVE-2026-29008
U-Boot integer underflow in TCP handler allows crafted packet to crash bootloader.
Is CVE-2026-29008 being exploited?
Not confirmed. CVE-2026-29008 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.71% probability of exploitation in the next 30 days.
How severe is CVE-2026-29008?
CVE-2026-29008 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-29008?
Yes. A fix has been recorded for CVE-2026-29008. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-29008 affect?
CVE-2026-29008 affects U-Boot <= 2026.04-rc3, Embedded devices using U-Boot (routers, gateways, SBCs, IoT devices). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-29008?
Upgrade U-Boot to a patched release; block untrusted TCP SYN+ACK at network edge.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Network-adjacent attacker can send a malformed TCP SYN+ACK to crash the bootloader, preventing device boot and possibly causing memory corruption.
Immediate action required
- affected<= 2026.04-rc3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.