CVE-2024-0193Public exploit

Local privilege escalation via catchall double deactivation

Published Jan 2, 2024 · Updated Mar 4, 2026

Use-after-free in Linux kernel netfilter allows local users with CAP_NET_ADMIN to escalate privileges through pipapo set deletion. The nft_trans_gc_catchall_sync path deactivates an expired catchall element after nft_delset already deactivated it, leaving an NFT_CHAIN or NFT_OBJECT reference usable after free. Reaching the flaw requires direct local access and CAP_NET_ADMIN, which unprivileged user namespaces can grant on affected RHEL systems; successful exploitation gains root privileges.

CVSS severity7.8
High
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel netfilter allows local users with CAP_NET_ADMIN to escalate privileges through pipapo set deletion. The nft_trans_gc_catchall_sync path deactivates an expired catchall element after nft_delset already deactivated it, leaving an NFT_CHAIN or NFT_OBJECT reference usable after free. Reaching the flaw requires direct local access and CAP_NET_ADMIN, which unprivileged user namespaces can grant on affected RHEL systems; successful exploitation gains root privileges.

The record

CVE
CVE-2024-0193
Published
Jan 2, 2024
Updated
Mar 4, 2026
Vendor
Red Hat
Product
Red Hat Enterprise Linux 9.2 Extended Update Support
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Red Hat · Red Hat Enterprise Linux 9.2 Extended Update SupportAffected versions are unavailable in this record.
Red Hat · Red Hat Enterprise Linux 9.0 Update Services for SAP SolutionsAffected versions are unavailable in this record.
The Linux Kernel Organization · Linux KernelAffected versions are unavailable in this record.
Red Hat · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.

Published CVSS scores

7.8Red Hat, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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