CVE-2023-7192Medium· 5.5▾ SunlitA 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 …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
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 to a refcount overflow.
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)kernelkernelkernel-rtkernel (all versions)kernel-rt (all versions)kernel (all versions)kernel-rt (all versions)Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Triggering this issue 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:
On containerized deployments, such as Red Hat OpenShift Container Platform, do not use this mitigation as the functionality is needed to be enabled.
Alternatively, 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.
How do I blacklist a kernel module to prevent it from loading automatically?
https://access.redhat.com/solutions/41278
Connected by shared product, vendor, weakness, or advisory.
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