CVE-2026-99999 Affecting kernel-debug-devel-matched package, versions <0:5.14.0-687.59.1.el9_8


Severity

Recommended
high

Based on AlmaLinux security rating.

Threat Intelligence

Exploit Maturity
Proof of Concept
EPSS
0.21% (11th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-ALMALINUX9-KERNELDEBUGDEVELMATCHED-21377625
  • published21 Oct 2026
  • disclosed20 Oct 2026

Introduced: 20 Oct 2026

NewCVE-2026-99999  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:9 kernel-debug-devel-matched to version 0:5.14.0-687.59.1.el9_8 or higher.
This issue was patched in ALSA-2026:86033.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-debug-devel-matched package and not the kernel-debug-devel-matched package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1