CVE-2023-4569

Kernel: information leak in nft_set_catchall_flush in net/netfilter/nf_tables_api.c

Description

A memory leak flaw was found in nft_set_catchall_flush in net/netfilter/nf_tables_api.c in the Linux Kernel. This issue may allow a local attacker to cause double-deactivations of catchall elements, which can result in a memory leak.

Remediation

Workaround:

  • Mitigation for this issue is to skip loading the affected module "nftables" onto the system until we have a fix available. This can be done by a blacklist mechanism that will ensure the driver is not loaded at boot time. ~~~ How do I blacklist a kernel module to prevent it from loading automatically? https://access.redhat.com/solutions/41278 ~~~

Categories

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.01%
Third-Party Advisory redhat.com Third-Party Advisory redhat.com Third-Party Advisory debian.org
Affected: n/a Kernel
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
Affected: Red Hat Red Hat Enterprise Linux 9
Affected: Fedora Fedora
Published at:
Updated at:

References

Link Tags
https://access.redhat.com/security/cve/CVE-2023-4569 third party advisory vdb entry
https://bugzilla.redhat.com/show_bug.cgi?id=2235470 patch third party advisory issue tracking
https://patchwork.ozlabs.org/project/netfilter-devel/patch/20230812110526.49808-1-fw@strlen.de/ patch mailing list
https://www.debian.org/security/2023/dsa-5492 third party advisory

Frequently Asked Questions

What is the severity of CVE-2023-4569?
CVE-2023-4569 has been scored as a medium severity vulnerability.
How to fix CVE-2023-4569?
As a workaround for remediating CVE-2023-4569: Mitigation for this issue is to skip loading the affected module "nftables" onto the system until we have a fix available. This can be done by a blacklist mechanism that will ensure the driver is not loaded at boot time. ~~~ How do I blacklist a kernel module to prevent it from loading automatically? https://access.redhat.com/solutions/41278 ~~~
Is CVE-2023-4569 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-4569 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-2023-4569?
CVE-2023-4569 affects n/a Kernel, 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, Red Hat Red Hat Enterprise Linux 9, Fedora Fedora.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.