CVE-2023-2640
First published: Wed Jul 26 2023(Updated: )
Last updated 29 November 2024
Credit: security@ubuntu.com security@ubuntu.com security@ubuntu.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Canonical Ubuntu Linux | =23.04 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.9-1 |
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-2023-2640
- https://ubuntu.com/security/notices/USN-6250-1
- https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.html
- https://wiz.io/blog/ubuntu-overlayfs-vulnerability
- https://launchpad.net/bugs/cve/CVE-2023-2640
- https://security-tracker.debian.org/tracker/CVE-2023-2640
- https://nvd.nist.gov/vuln/detail/CVE-2023-2640
- https://ubuntu.com/security/CVE-2023-2640
Frequently Asked Questions
What is CVE-2023-2640?
CVE-2023-2640 is a vulnerability in Ubuntu kernels that allows an unprivileged user to set privileged extended attributes on mounted files without appropriate security checks.
What is the severity of CVE-2023-2640?
The severity of CVE-2023-2640 is high with a CVSS score of 7.8.
Which software is affected by CVE-2023-2640?
Ubuntu Linux 23.04, ubuntu/linux 6.2.0-26.26, ubuntu/linux-hwe-5.19 5.19.0-50.50, and other Ubuntu packages are affected by CVE-2023-2640.
How can I fix CVE-2023-2640?
To fix CVE-2023-2640, update your Ubuntu kernel and packages to the recommended versions mentioned in the Ubuntu Security Notice (USN-6250-1).
Where can I find more information about CVE-2023-2640?
You can find more information about CVE-2023-2640 on the MITRE CVE website, Ubuntu Security Notice (USN-6250-1), and the Ubuntu kernel-team mailing list.
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