CVE-2026-99999
CRITICAL
CVSS 9.3
Published: 2026-10-15
Modified: 2026-10-16
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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.
Quick Facts
| CVE ID | CVE-2026-99999 |
| CVSS Score | 9.3 |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
| Published | 2026-10-15 |
| Exploited | No |
| CISA KEV | No |
| PoC | Not public |
References
- https://git.kernel.org/stable/c/0fab003ef4698e0628060a45a48f…
- https://git.kernel.org/stable/c/32a8b0adaa18e52aaa0b246b5ffe…
- https://git.kernel.org/stable/c/6785011f8b16abf40b1e9d8b2e33…
- https://git.kernel.org/stable/c/94524b7b32691de2e2ce162c04d6…
- https://git.kernel.org/stable/c/a464d950f31c89565cbaae038cc6…
- https://git.kernel.org/stable/c/a65f69e0f38ffbed1b128029e090…
- https://git.kernel.org/stable/c/c3e33464746166264334641dc850…
- https://git.kernel.org/stable/c/f3e835af6226f1dd12160cbd6960…
- https://pwn.ai/blog/Pwnescape
- https://vercel.com/blog/findings-from-the-1-million-dollar-v…