U-Boot is a widely used bootloader across embedded, network and industrial devices; bootloader RCE can compromise fleets and persist across reboots.
CVE-2026-15390
U-Boot IP defragmentation flaw permits remote RCE via crafted fragmented IP packets.
Is CVE-2026-15390 being exploited?
Not confirmed. CVE-2026-15390 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.
How severe is CVE-2026-15390?
CVE-2026-15390 is rated Critical with a CVSS score of 9.0. 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-2026-15390?
Yes. A fix has been recorded for CVE-2026-15390. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-15390 affect?
CVE-2026-15390 affects Das U-Boot bootloader (embedded devices), Routers, IoT devices, Industrial/OT devices using U-Boot. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-15390?
Upgrade U-Boot to 2026.07 or apply vendor patch; block/inspect fragmented IP traffic.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote arbitrary code execution by sending duplicated last-fragment IP packets during IP reassembly, enabling persistent device compromise.
Immediate action required
- affected>= 2009.08 and <= 2026.07
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.