CVE-2024-0193

Kernel: 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.

Remediation

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.

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.07%
Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions
Affected: Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
Affected: Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat RHOL-5.8-RHEL-9
Affected: Red Hat Red Hat Enterprise Linux 6
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 7
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 8
Affected: Red Hat Red Hat Enterprise Linux 9
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/errata/RHSA-2024:1018 vendor advisory
https://access.redhat.com/errata/RHSA-2024:1019 vendor advisory
https://access.redhat.com/errata/RHSA-2024:1248 vendor advisory
https://access.redhat.com/errata/RHSA-2024:2094 vendor advisory
https://access.redhat.com/errata/RHSA-2024:4412 vendor advisory
https://access.redhat.com/errata/RHSA-2024:4415 vendor advisory
https://access.redhat.com/security/cve/CVE-2024-0193 vdb entry third party advisory mitigation
https://bugzilla.redhat.com/show_bug.cgi?id=2255653 third party advisory patch issue tracking

Frequently Asked Questions

What is the severity of CVE-2024-0193?
CVE-2024-0193 has been scored as a high severity vulnerability.
How to fix CVE-2024-0193?
As a workaround for remediating CVE-2024-0193: 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.
Is CVE-2024-0193 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2024-0193 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-0193?
CVE-2024-0193 affects Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9, Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions, Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support, Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat RHOL-5.8-RHEL-9, Red Hat Red Hat Enterprise Linux 6, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 7, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 8, Red Hat Red Hat Enterprise Linux 9.
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