CVE-2024-56638 Affecting kernel-uek-debug package, versions <0:6.12.0-101.33.4.3.el9uek


Severity

Recommended
high

Based on Oracle Linux security rating.

Threat Intelligence

EPSS
0.04% (13th percentile)

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  • Snyk IDSNYK-ORACLE9-KERNELUEKDEBUG-10780368
  • published18 Jul 2025
  • disclosed27 Dec 2024

Introduced: 27 Dec 2024

CVE-2024-56638  (opens in a new tab)

How to fix?

Upgrade Oracle:9 kernel-uek-debug to version 0:6.12.0-101.33.4.3.el9uek or higher.
This issue was patched in ELSA-2025-20480.

NVD Description

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

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

netfilter: nft_inner: incorrect percpu area handling under softirq

Softirq can interrupt ongoing packet from process context that is walking over the percpu area that contains inner header offsets.

Disable bh and perform three checks before restoring the percpu inner header offsets to validate that the percpu area is valid for this skbuff:

  1. If the NFT_PKTINFO_INNER_FULL flag is set on, then this skbuff has already been parsed before for inner header fetching to register.

  2. Validate that the percpu area refers to this skbuff using the skbuff pointer as a cookie. If there is a cookie mismatch, then this skbuff needs to be parsed again.

  3. Finally, validate if the percpu area refers to this tunnel type.

Only after these three checks the percpu area is restored to a on-stack copy and bh is enabled again.

After inner header fetching, the on-stack copy is stored back to the percpu area.

CVSS Base Scores

version 3.1