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Comment Anybody knows whether this is really ICMP? (Score 2) 77

I looked at a few write-ups of CVE-2026-97631, but while they all mention PXE (and PXE uses DHCP, depending on configuration), none mentions ICMP. It would not make a lot of sense for the UEFI boot process to process ICMP packets either. Not ruling it out, people have done a lot of really stupid things with UEFI, but it does not seem to make a lot of sense here.

Does anybody know whether this is really ICMP? ICMP would could make this an attack potentially not local to the network segment, while DHCP and PXE make it network-segment local.

Comment Re:RCE Execution pathway (Score 1) 77

It is not ICMP. It is DHCP. And DHCP does broadcast to find the DHCP servers, so every machine in the local network sees it. If you do remote booting without DHCP (I used to do that via floppies wayyy back, but this requires the booting machine to get the IP of the boot server in some way), you are probably a lot harder to attack.

Comment Re:To be clear... (Score 1) 77

Ah, no. When Windows (or Linux) is running and attacker manages to get to the level of hardware access to write the BIOS chips, you are screwed, no connection to this vulnerability. They can simply add a key for their own kernel or switch secure boot off. What this vulnerability does is that if you use remote boot (PXE), they can get you to bute an unsigned kernel via a an attack coming from the local network.

Comment Re:Risk Severity (Score 1) 77

Yes. The problem is that these days, remote booting can and typically uses DHCP. And DHCP does broadcast-type requests that every machine in the network segment sees. Of course, an attack has to come from the same network segment or rather broadcast domain (which are typically the same) so this is not a regular "long-distance" remote vulnerability, but essentially a "network local" remote vulnerability. Still pretty bad.

Comment Re:US fabs? (Score 1) 52

They use TSMC and Samsung, so South Korea, Taiwan, or, theoretically, the US.

Components sourced from U.S. and allied-country suppliers account for more than 90% of the BlueChip prototypes’ component procurement cost.

Both South Korea and Taiwan are US allies.

The more interesting question is what are the 10% that they aren't sourcing from allies?

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