CVE-2023-6622: Kernel: null pointer dereference vulnerability in nft_dynset_init()
First published: Fri Dec 08 2023(Updated: )
A null pointer dereference vulnerability was found in nft_dynset_init() in net/netfilter/nft_dynset.c in nf_tables in the Linux kernel. This issue may allow a local attacker with CAP_NET_ADMIN user privilege to trigger a denial of service.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| IBM Security Guardium | <=12.0 | |
| Linux Linux kernel | <=6.6 | |
| Linux Linux kernel | =6.7-rc1 | |
| Linux Linux kernel | =6.7-rc2 | |
| Linux Linux kernel | =6.7-rc3 | |
| Linux Linux kernel | =6.7-rc4 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =9.0 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 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://exchange.xforce.ibmcloud.com/vulnerabilities/273677
- https://www.ibm.com/support/pages/node/7152469 (Advisory)
- https://github.com/torvalds/linux/commit/3701cd390fd731ee7ae8b8006246c8db82c72bea
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2253633
- https://access.redhat.com/errata/RHSA-2024:2394
- https://access.redhat.com/errata/RHSA-2024:2950
- https://access.redhat.com/errata/RHSA-2024:3138
- https://bugzilla.redhat.com/show_bug.cgi?id=2253632
- https://access.redhat.com/security/cve/CVE-2023-6622
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AAOVK2F3ALGKYIQ5IOMAYEC2DGI7BWAW/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/G3AGDVE3KBLOOYBPISFDS74R4YAZEDAY/
- https://launchpad.net/bugs/cve/CVE-2023-6622
- https://git.kernel.org/linus/3701cd390fd731ee7ae8b8006246c8db82c72bea
- https://security-tracker.debian.org/tracker/CVE-2023-6622
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6622
- https://nvd.nist.gov/vuln/detail/CVE-2023-6622
- https://ubuntu.com/security/CVE-2023-6622
Frequently Asked Questions
What is CVE-2023-6622?
CVE-2023-6622 is a null pointer dereference vulnerability in nft_dynset_init() in nf_tables in the Linux kernel.
How severe is CVE-2023-6622?
CVE-2023-6622 has a severity rating of medium, with a CVSS score of 5.5.
How does CVE-2023-6622 impact the system?
CVE-2023-6622 can allow a local attacker with CAP_NET_ADMIN user privilege to trigger a denial of service.
What is the fix for CVE-2023-6622?
To fix CVE-2023-6622, apply the patch provided by the Linux kernel developers.
Where can I find more information about CVE-2023-6622?
You can find more information about CVE-2023-6622 at the following references: [Red Hat Security Advisory](https://access.redhat.com/security/cve/CVE-2023-6622), [Red Hat Bugzilla](https://bugzilla.redhat.com/show_bug.cgi?id=2253632), [Linux Kernel Commit](https://github.com/torvalds/linux/commit/3701cd390fd731ee7ae8b8006246c8db82c72bea).
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