#cve202699999 — Public Fediverse posts

🚨 PwnEscape (CVE-2026-99999) has been identified as a notable vulnerability.

In the Linux kernel, the following vulnerability has been resolved:

ipv4: validate checksum_start before completing checksum

If a packet with bad checksum metadata gets into the ipv4 stack,
skb_checksum_help can corrupt the network header and cause a bunch of
mischief.

This was discovered and reported by Paulos, and has been reporoduced
by others independently since.

We really shouldn't allow such packets in, but as a defence
in depth measure, let's also check before we complete the checksum.

A more complete validation at input is forthcoming, but needs more work.

ℹ️ Additional details, advisories and sightings on ZEN SecDB 👉 https://secdb.nttzen.cloud/cve/detail/CVE-2026-99999

#InfoSec #PwnEscape #Linux #Kernel #CVE202699999
#NTTDATA #ZENSecDB

So far, we’re only talking about a theoretical “escape to root” and a host memory leak from a virtual machine. Again, theoretical. And the author didn’t say where he did this. There’s no PoC, and no one has reported any exploits yet

#pwnescape #cve202699999

https://pwn.ai/blog/pwnescape

A new, cool CVE-2026-99999. It was discovered last night (GMT), but I'm only writing about it now. I was too lazy. I think the hype surrounding it is solely due to the cool number.
But still, 9.3. Details below (unless I suddenly get lazy again)

#pwnescape #cve202699999