CVE-2023-7192: Kernel: refcount leak in ctnetlink_create_conntrack()
First published: Sat Dec 30 2023(Updated: )
A memory leak problem was found in ctnetlink_create_conntrack in net/netfilter/nf_conntrack_netlink.c in the Linux Kernel. In this flaw a local attacker with CAP_NET_ADMIN privilege may cause a denial of service (DoS) attack due to a refcount overflows. Refer: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=ac4893980bbe79ce383daf9a0885666a30fe4c83">https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=ac4893980bbe79ce383daf9a0885666a30fe4c83</a>
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <6.3 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =9.0 | |
| redhat/Kernel | <6.3 | 6.3 |
| IBM QRadar SIEM | <=7.5 - 7.5.0 UP8 IF01 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.5-1 6.11.7-1 |
Remedy
If not needed, disable the ability for unprivileged users to create namespaces. To do this temporarily, do: sudo sysctl -w kernel.unprivileged_userns_clone=0 To disable across reboots, do: echo kernel.unprivileged_userns_clone=0 | \ sudo tee /etc/sysctl.d/99-disable-unpriv-userns.conf
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Reference Links
- https://access.redhat.com/errata/RHSA-2024:0723
- https://access.redhat.com/errata/RHSA-2024:0725
- https://access.redhat.com/errata/RHSA-2024:1188
- https://access.redhat.com/errata/RHSA-2024:1250
- https://access.redhat.com/errata/RHSA-2024:1306
- https://access.redhat.com/errata/RHSA-2024:1367
- https://access.redhat.com/errata/RHSA-2024:1382
- https://access.redhat.com/errata/RHSA-2024:1404
- https://access.redhat.com/errata/RHSA-2024:2006
- https://access.redhat.com/errata/RHSA-2024:2008
- https://access.redhat.com/security/cve/CVE-2023-7192
- https://bugzilla.redhat.com/show_bug.cgi?id=2256279
- https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=ac4893980bbe79ce383daf9a0885666a30fe4c83
- https://launchpad.net/bugs/cve/CVE-2023-7192
- https://exchange.xforce.ibmcloud.com/vulnerabilities/278669
- https://www.ibm.com/support/pages/node/7150684 (Advisory)
- https://git.kernel.org/linus/ac4893980bbe79ce383daf9a0885666a30fe4c83
- https://security-tracker.debian.org/tracker/CVE-2023-7192
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-7192
- https://nvd.nist.gov/vuln/detail/CVE-2023-7192
- https://ubuntu.com/security/CVE-2023-7192
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