CVE-2024-0607: Kernel: nf_tables: pointer math issue in nft_byteorder_eval()
First published: Tue Jan 16 2024(Updated: )
A flaw was found in the Netfilter module in the Linux kernel. The problem is in the nft_byteorder_eval() function where the code is iterating through a loop and writing to dst[0], dst[1], dst[2] and so on. On each iteration 8 bytes get written, but dst[] is an array of u32 so each element only has space for 4 bytes. That means that every iteration overwrites part of the previous element. Upstream commit: <a href="https://github.com/torvalds/linux/commit/c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63">https://github.com/torvalds/linux/commit/c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63</a>
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <6.7 | 6.7 |
| Linux Linux kernel | <6.7 | |
| Linux Linux kernel | =6.7-rc1 | |
| Fedoraproject Fedora | =39 | |
| Redhat Enterprise Linux | =8.0 | |
| Redhat Enterprise Linux | =9.0 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.3-1 |
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://bugzilla.redhat.com/show_bug.cgi?id=2258635
- https://access.redhat.com/security/cve/CVE-2024-0607
- https://github.com/torvalds/linux/commit/c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63
- https://launchpad.net/bugs/cve/CVE-2024-0607
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2258636
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-0607
- https://nvd.nist.gov/vuln/detail/CVE-2024-0607
- https://security-tracker.debian.org/tracker/CVE-2024-0607
- https://ubuntu.com/security/CVE-2024-0607
- https://git.kernel.org/linus/c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63
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