{"id":"CVE-2023-7192","title":"Kernel: refcount leak in ctnetlink_create_conntrack()","summary":"A memory leak problem was found in ctnetlink_create_conntrack in net/netfilter/nf_conntrack_netlink.c in the Linux Kernel. This issue may allow a local attacker with CAP_NET_ADMIN privileges to cause a denial of service (DoS) attack due …","severity":"medium","cvss":5.5,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-401"],"vendor":"Red Hat","product":"kernel","affected":["kernel (all versions)","kernel-rt (all versions)","kernel (all versions)","kernel (all versions)","kernel (all versions)","kernel-rt (all versions)","kernel (all versions)","kernel (all versions)","kernel (all versions)","kernel (all versions)","kernel (all versions)","kernel-rt (all versions)","kernel (all versions)","kernel-rt (all versions)","kernel (all versions)","kernel","kernel","kernel-rt","kernel (all versions)","kernel-rt (all versions)","kernel (all versions)","kernel-rt (all versions)"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2024-01-16T19:33:50.679311Z"},"published":"2024-01-02","updated":"2026-11-05","sourceUpdated":"2026-11-05T11:38:07.888Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-7192","references":[{"url":"https://access.redhat.com/errata/RHSA-2024:0723","label":"RHSA-2024:0723"},{"url":"https://access.redhat.com/errata/RHSA-2024:0725","label":"RHSA-2024:0725"},{"url":"https://access.redhat.com/errata/RHSA-2024:1188","label":"RHSA-2024:1188"},{"url":"https://access.redhat.com/errata/RHSA-2024:1250","label":"RHSA-2024:1250"},{"url":"https://access.redhat.com/errata/RHSA-2024:1306","label":"RHSA-2024:1306"},{"url":"https://access.redhat.com/errata/RHSA-2024:1367","label":"RHSA-2024:1367"},{"url":"https://access.redhat.com/errata/RHSA-2024:1382","label":"RHSA-2024:1382"},{"url":"https://access.redhat.com/errata/RHSA-2024:1404","label":"RHSA-2024:1404"},{"url":"https://access.redhat.com/errata/RHSA-2024:2006","label":"RHSA-2024:2006"},{"url":"https://access.redhat.com/errata/RHSA-2024:2008","label":"RHSA-2024:2008"},{"url":"https://access.redhat.com/security/cve/CVE-2023-7192"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2256279","label":"RHBZ#2256279"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=ac4893980bbe79ce383daf9a0885666a30fe4c83"}],"tags":["cve.org"],"epss":0.00298,"epssPercentile":0.22647,"ingestedAt":"2026-11-05T21:36:00.813Z","slug":"CVE-2023-7192","body":"## Overview\n\nA memory leak problem was found in ctnetlink_create_conntrack in net/netfilter/nf_conntrack_netlink.c in the Linux Kernel. This issue may allow a local attacker with CAP_NET_ADMIN privileges to cause a denial of service (DoS) attack due to a refcount overflow.\n\n## Affected\n\n- `kernel (all versions)`\n- `kernel-rt (all versions)`\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel-rt (all versions)`\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel (all versions)`\n- `kernel-rt (all versions)`\n- `kernel (all versions)`\n- `kernel-rt (all versions)`\n- `kernel (all versions)`\n- `kernel`\n- `kernel`\n- `kernel-rt`\n- `kernel (all versions)`\n- `kernel-rt (all versions)`\n- `kernel (all versions)`\n- `kernel-rt (all versions)`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nTriggering this issue requires the ability to create user/net namespaces.\n\nOn non-containerized deployments of Red Hat Enterprise Linux 8, you can disable user namespaces by setting user.max_user_namespaces to 0:\n\n# echo \"user.max_user_namespaces=0\" > /etc/sysctl.d/userns.conf\n# sysctl -p /etc/sysctl.d/userns.conf\n\nOn containerized deployments, such as Red Hat OpenShift Container Platform, do not use this mitigation as the functionality is needed to be enabled.\n\nAlternatively, skip loading the affected netfilter module (i.e., nf_conntrack_netlink) onto the system until we have a fix available. This can be done by a blacklist mechanism which will ensure the driver is not loaded at boot time.\n~~~\nHow do I blacklist a kernel module to prevent it from loading automatically?\nhttps://access.redhat.com/solutions/41278 \n~~~","depth":"sunlit","depthScore":30,"depthScoreParts":{"impact":30.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}