CVE-2023-31248: (Pwn2Own) Linux Kernel nftables Use-After-Free Local Privilege Escalation Vulnerability
First published: Wed Jul 05 2023(Updated: )
Last updated 25 October 2024
Credit: security@ubuntu.com security@ubuntu.com security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | =5.9.0-rc1 | |
| Fedoraproject Fedora | =37 | |
| Fedoraproject Fedora | =38 | |
| Debian Debian Linux | =11.0 | |
| Linux kernel | ||
| Linux Linux kernel | >=5.9<5.10.188 | |
| Linux Linux kernel | >=5.11<5.15.121 | |
| Linux Linux kernel | >=5.16<6.1.39 | |
| Linux Linux kernel | >=6.2<6.4.4 | |
| Canonical Ubuntu Linux | =14.04 | |
| Canonical Ubuntu Linux | =16.04 | |
| Canonical Ubuntu Linux | =18.04 | |
| Canonical Ubuntu Linux | =20.04 | |
| Canonical Ubuntu Linux | =22.04 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.106-3 6.1.112-1 6.11.4-1 6.11.5-1 |
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
- http://packetstormsecurity.com/files/173757/Kernel-Live-Patch-Security-Notice-LSN-0096-1.html
- http://packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LSN-0097-1.html
- http://www.openwall.com/lists/oss-security/2023/07/05/2
- https://lists.debian.org/debian-lts-announce/2023/08/msg00001.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGZC5XOANA75OJ4XARBBXYSLDKUIJI5E/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UPHI46ROSSLVAV4R5LJWJYU747JGOS6D/
- https://lore.kernel.org/netfilter-devel/20230705121627.GC19489@breakpoint.cc/T/
- https://www.debian.org/security/2023/dsa-5453
- https://www.openwall.com/lists/oss-security/2023/07/05/2
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2221778
- https://access.redhat.com/errata/RHSA-2023:5091
- https://access.redhat.com/errata/RHSA-2023:5093
- https://access.redhat.com/errata/RHSA-2023:5069
- https://access.redhat.com/errata/RHSA-2023:5575
- https://access.redhat.com/errata/RHSA-2023:5603
- https://access.redhat.com/errata/RHSA-2023:5604
- https://bugzilla.redhat.com/show_bug.cgi?id=2220893
- https://www.zerodayinitiative.com/advisories/ZDI-23-899/
- https://security.netapp.com/advisory/ntap-20240201-0001/
- https://launchpad.net/bugs/cve/CVE-2023-31248
- https://security-tracker.debian.org/tracker/CVE-2023-31248
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-31248
- https://nvd.nist.gov/vuln/detail/CVE-2023-31248
- https://ubuntu.com/security/CVE-2023-31248
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