Intelligence online17 sources monitored16 actively exploited 7d28 published 24hChecked recently
Vulnerability record

CVE-2026-99999

CriticalNo known exploitation

Patch status

No official fix confirmed yet

Until a fix ships, follow the vendor's mitigations, limit exposure of affected systems, and watch this record for a patch.

Description

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.

Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.

Intelligence timeline

Developments from the last 30 days, newest first.

  1. CVSS scoredUpdate

    CVE-2026-99999 scored CVSS 9.3

    Basis: NIST National Vulnerability Database

Coverage

We have not published a story about this vulnerability yet.

References

  • git.kernel.org https://git.kernel.org/stable/c/0fab003ef4698e0628060a45a48f14b43ba2a40a
  • git.kernel.org https://git.kernel.org/stable/c/32a8b0adaa18e52aaa0b246b5ffe683075354dbb
  • git.kernel.org https://git.kernel.org/stable/c/6785011f8b16abf40b1e9d8b2e332232b3e68822
  • git.kernel.org https://git.kernel.org/stable/c/94524b7b32691de2e2ce162c04d6cbc9106e5cbf
  • git.kernel.org https://git.kernel.org/stable/c/a464d950f31c89565cbaae038cc60db04fe01956
  • git.kernel.org https://git.kernel.org/stable/c/a65f69e0f38ffbed1b128029e09097436416dc8b
  • git.kernel.org https://git.kernel.org/stable/c/c3e33464746166264334641dc850a36eef7e6326
  • git.kernel.org https://git.kernel.org/stable/c/f3e835af6226f1dd12160cbd696081e9b6155de0
  • pwn.ai https://pwn.ai/blog/Pwnescape
  • vercel.com https://vercel.com/blog/findings-from-the-1-million-dollar-vercel-sandbox-challenge