Critical Linux Linux Kernel Vulnerability Scores 9.3 CVSS

Last refreshed2026-10-15

Status: UPDATED | Advisory ID: CVE-2026-99999

Key Details

CVE	CVE-2026-99999
CVSS Score / Version	9.3 (Critical) / CVSS v3.1
Updated	2026-10-15
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is none; user interaction is none; scope is changed; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-99999
CVE	https://www.cve.org/CVERecord?id=CVE-2026-99999

Source

Reference

NVD

CVE