CVE-2024-1085: Use-after-free in Linux kernel's netfilter: nf_tables component
First published: Wed Jan 31 2024(Updated: )
A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. The nft_setelem_catchall_deactivate() function checks whether the catch-all set element is active in the current generation instead of the next generation before freeing it, but only flags it inactive in the next generation, making it possible to free the element multiple times, leading to a double free vulnerability. We recommend upgrading past commit b1db244ffd041a49ecc9618e8feb6b5c1afcdaa7.
Credit: cve-coordination@google.com cve-coordination@google.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=5.13<5.15.148 | |
| Linux Linux kernel | >=5.16<6.1.75 | |
| Linux Linux kernel | >=6.2<6.6.14 | |
| Linux Linux kernel | >=6.7<6.7.2 | |
| redhat/kernel | <6.8 | 6.8 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b1db244ffd041a49ecc9618e8feb6b5c1afcdaa7
- https://kernel.dance/b1db244ffd041a49ecc9618e8feb6b5c1afcdaa7
- https://launchpad.net/bugs/cve/CVE-2024-1085
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2262129
- https://access.redhat.com/errata/RHSA-2024:1019
- https://access.redhat.com/errata/RHSA-2024:1018
- https://access.redhat.com/errata/RHSA-2024:2394
- https://bugzilla.redhat.com/show_bug.cgi?id=2262127
- https://git.kernel.org/linus/b1db244ffd041a49ecc9618e8feb6b5c1afcdaa7
- https://security-tracker.debian.org/tracker/CVE-2024-1085
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-1085
- https://nvd.nist.gov/vuln/detail/CVE-2024-1085
- https://ubuntu.com/security/CVE-2024-1085
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