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 |
|---|---|---|
| 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 | |
| ubuntu/linux | <5.15.0-94.104 | 5.15.0-94.104 |
| ubuntu/linux | <6.5.0-17.17 | 6.5.0-17.17 |
| ubuntu/linux-aws | <5.15.0-1053.58 | 5.15.0-1053.58 |
| ubuntu/linux-aws | <6.5.0-1013.13 | 6.5.0-1013.13 |
| ubuntu/linux-aws-5.15 | <5.15.0-1053.58~20.04.1 | 5.15.0-1053.58~20.04.1 |
| ubuntu/linux-azure | <5.15.0-1056.64 | 5.15.0-1056.64 |
| ubuntu/linux-azure | <6.5.0-1015.15 | 6.5.0-1015.15 |
| ubuntu/linux-azure-5.15 | <5.15.0-1056.64~20.04.1 | 5.15.0-1056.64~20.04.1 |
| ubuntu/linux-azure-fde | <5.15.0-1056.64.1 | 5.15.0-1056.64.1 |
| ubuntu/linux-azure-fde-5.15 | <5.15.0-1056.64~20.04.1.1 | 5.15.0-1056.64~20.04.1.1 |
| ubuntu/linux-gcp | <5.15.0-1051.59 | 5.15.0-1051.59 |
| ubuntu/linux-gcp | <6.5.0-1013.13 | 6.5.0-1013.13 |
| ubuntu/linux-gcp-5.15 | <5.15.0-1051.59~20.04.1 | 5.15.0-1051.59~20.04.1 |
| ubuntu/linux-gke | <5.15.0-1050.55 | 5.15.0-1050.55 |
| ubuntu/linux-gkeop | <5.15.0-1036.42 | 5.15.0-1036.42 |
| ubuntu/linux-gkeop-5.15 | <5.15.0-1036.42~20.04.1 | 5.15.0-1036.42~20.04.1 |
| ubuntu/linux-hwe-5.15 | <5.15.0-94.104~20.04.1 | 5.15.0-94.104~20.04.1 |
| ubuntu/linux-hwe-6.5 | <6.5.0-17.17~22.04.1 | 6.5.0-17.17~22.04.1 |
| ubuntu/linux-ibm | <5.15.0-1046.49 | 5.15.0-1046.49 |
| ubuntu/linux-ibm-5.15 | <5.15.0-1046.49~20.04.1 | 5.15.0-1046.49~20.04.1 |
| ubuntu/linux-intel-iotg | <5.15.0-1047.53 | 5.15.0-1047.53 |
| ubuntu/linux-intel-iotg-5.15 | <5.15.0-1048.54~20.04.1 | 5.15.0-1048.54~20.04.1 |
| ubuntu/linux-kvm | <5.15.0-1050.55 | 5.15.0-1050.55 |
| ubuntu/linux-laptop | <6.5.0-1009.12 | 6.5.0-1009.12 |
| ubuntu/linux-lowlatency | <5.15.0-94.104 | 5.15.0-94.104 |
| ubuntu/linux-lowlatency | <6.5.0-17.17.1 | 6.5.0-17.17.1 |
| ubuntu/linux-lowlatency-hwe-5.15 | <5.15.0-94.104~20.04.1 | 5.15.0-94.104~20.04.1 |
| ubuntu/linux-lowlatency-hwe-6.5 | <6.5.0-17.17.1.1.1~22.04.1 | 6.5.0-17.17.1.1.1~22.04.1 |
| ubuntu/linux-nvidia | <5.15.0-1044.44 | 5.15.0-1044.44 |
| ubuntu/linux-oem-6.1 | <6.1.0-1033.33 | 6.1.0-1033.33 |
| ubuntu/linux-oem-6.5 | <6.5.0-1014.15 | 6.5.0-1014.15 |
| ubuntu/linux-oracle | <5.15.0-1051.57 | 5.15.0-1051.57 |
| ubuntu/linux-oracle | <6.5.0-1015.15 | 6.5.0-1015.15 |
| ubuntu/linux-oracle-5.15 | <5.15.0-1051.57~20.04.1 | 5.15.0-1051.57~20.04.1 |
| ubuntu/linux-raspi | <5.15.0-1046.49 | 5.15.0-1046.49 |
| ubuntu/linux-raspi | <6.5.0-1010.13 | 6.5.0-1010.13 |
| ubuntu/linux-riscv | <6.5.0-17.17.1 | 6.5.0-17.17.1 |
| ubuntu/linux-riscv-5.15 | <5.15.0-1049.53~20.04.2 | 5.15.0-1049.53~20.04.2 |
| ubuntu/linux-starfive | <6.5.0-1007.8 | 6.5.0-1007.8 |
| ubuntu/linux-xilinx-zynqmp | <5.15.0-1027.31 | 5.15.0-1027.31 |
| debian/linux | 4.19.249-2 4.19.304-1 5.10.209-2 5.10.205-2 6.1.76-1 6.1.85-1 6.6.15-2 6.7.12-1 |
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://github.com/torvalds/linux/commit/3701cd390fd731ee7ae8b8006246c8db82c72bea
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2253633
- 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://ubuntu.com/security/notices/USN-6624-1
- https://ubuntu.com/security/notices/USN-6626-1
- https://ubuntu.com/security/notices/USN-6628-1
- https://ubuntu.com/security/notices/USN-6626-2
- https://ubuntu.com/security/notices/USN-6628-2
- https://ubuntu.com/security/notices/USN-6639-1
- https://ubuntu.com/security/notices/USN-6626-3
- https://ubuntu.com/security/notices/USN-6652-1
- https://www.cve.org/CVERecord?id=CVE-2023-6622
- https://nvd.nist.gov/vuln/detail/CVE-2023-6622
- https://security-tracker.debian.org/tracker/CVE-2023-6622
- https://git.kernel.org/linus/48b0ae046ee96eac999839f6d26c624b8c93ed66
- https://ubuntu.com/security/CVE-2023-6622
- https://access.redhat.com/errata/RHSA-2024:2394
Parent vulnerabilities
(Appears in the following advisories)
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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