CVE-2024-0193Kernel: netfilter: use-after-free in nft_trans_gc_catchall_sync leads to privilege escalation

Description

A use-after-free flaw was found in the netfilter subsystem of the Linux kernel. If the catchall element is garbage-collected when the pipapo set is removed, the element can be deactivated twice. This can cause a use-after-free issue on an NFT_CHAIN object or NFT_OBJECT object, allowing a local unprivileged user with CAP_NET_ADMIN capability to escalate their privileges on the system.

Timeline

Scores

EPSS (exploitation in 30 days)

0.84% · top 42% of all CVEs (13 Nov 2026)

CISA SSVC

Exploitation: poc · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Affected products

• kernel

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:5.14.0-362.24.1.el9_3 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:5.14.0-362.24.1.el9_3 – < *

• Red Hat · Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

  • unaffected 0:5.14.0-70.105.1.el9_0 – < *

• Red Hat · Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

  • unaffected 0:5.14.0-70.105.1.rt21.177.el9_0 – < *

• Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support

  • unaffected 0:5.14.0-284.55.1.el9_2 – < *

• Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support

  • unaffected 0:5.14.0-284.55.1.rt14.340.el9_2 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-22 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-11 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v6.8.1-407 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-19 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v1.0.0-479 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-7 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v0.4.0-247 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-5 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v1.1.0-227 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.1-470 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v2.9.6-14 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-2 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-24 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v5.8.6-10 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v0.1.0-525 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v0.1.0-224 – < *

• Red Hat · RHOL-5.8-RHEL-9

  • unaffected v0.28.1-56 – < *

• Red Hat · Red Hat Enterprise Linux 6

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 7

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 7

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 8

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 8

  All versions: unaffected

• Red Hat · Red Hat Enterprise Linux 9

  All versions: affected

What to do

Workaround: In order to trigger the issue, it requires the ability to create user/net namespaces. On non-containerized deployments of Red Hat Enterprise Linux 8, you can disable user namespaces by setting user.max_user_namespaces to 0: # echo "user.max_user_namespaces=0" > /etc/sysctl.d/userns.conf # sysctl -p /etc/sysctl.d/userns.conf On containerized deployments, such as Red Hat OpenShift Container Platform, do not use this mitigation as the functionality is needed to be enabled.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2024-15992 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2024-0193](https://cveledger.app/badge/CVE-2024-0193.svg)](https://cveledger.app/cve/CVE-2024-0193)

Record last updated 4 Nov 2026, 21:07 UTC.