CVE-2023-6040: An out-of-bounds access vulnerability involving netfilter was reported and fixed as: f1082dd31fe4 (netfilter: nf_tables: Reject tables of unsupported family)
First published: Fri Jan 12 2024(Updated: )
An out-of-bounds access vulnerability involving netfilter was reported and fixed as: f1082dd31fe4 (netfilter: nf_tables: Reject tables of unsupported family); While creating a new netfilter table, lack of a safeguard against invalid nf_tables family (pf) values within `nf_tables_newtable` function enables an attacker to achieve out-of-bounds access.
Credit: security@ubuntu.com security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <5.18 | 5.18 |
| Linux Kernel | >=4.16<4.19.305 | |
| Linux Kernel | >=4.20<5.4.267 | |
| Linux Kernel | >=5.5<5.10.208 | |
| Linux Kernel | >=5.11<5.15.147 | |
| Linux Kernel | >=5.16<5.18 | |
| Debian Linux | =10.0 | |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Software Stack | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Virtual Appliance | <=ISVG 10.0.2 | |
| IBM Security Verify Governance Identity Manager Container | <=ISVG 10.0.2 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.21-1 6.12.22-1 |
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://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6040
- https://www.openwall.com/lists/oss-security/2024/01/12/1
- http://www.openwall.com/lists/oss-security/2024/01/12/1
- http://packetstormsecurity.com/files/177029/Kernel-Live-Patch-Security-Notice-LSN-0100-1.html
- https://launchpad.net/bugs/cve/CVE-2023-6040
- https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f1082dd31fe461d482d69da2a8eccfeb7bf07ac2
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2265572
- https://access.redhat.com/errata/RHSA-2024:2394
- https://access.redhat.com/errata/RHSA-2024:7001
- https://access.redhat.com/errata/RHSA-2024:7000
- https://bugzilla.redhat.com/show_bug.cgi?id=2258013
- https://nvd.nist.gov/vuln/detail/CVE-2023-6040
- https://security-tracker.debian.org/tracker/CVE-2023-6040
- https://ubuntu.com/security/CVE-2023-6040
- https://git.kernel.org/linus/f1082dd31fe461d482d69da2a8eccfeb7bf07ac2
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2023-6040?
CVE-2023-6040 is classified as a high-severity vulnerability due to the potential for out-of-bounds access leading to denial of service or other impacts.
How do I fix CVE-2023-6040?
To fix CVE-2023-6040, update the kernel to version 5.18 or later, or apply the appropriate patches provided by your distribution.
Which versions of Linux Kernel are affected by CVE-2023-6040?
CVE-2023-6040 affects Linux Kernel versions between 4.16 and 5.18, including specific versions of Debian and Red Hat kernels.
Can CVE-2023-6040 cause data loss?
While CVE-2023-6040 primarily poses a risk of denial of service, it could potentially lead to data corruption in certain exploitation scenarios.
Is there a workaround for CVE-2023-6040?
There are no recommended workarounds for CVE-2023-6040 other than upgrading to the fixed versions of the kernel.
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