CVE-2023-6932: Fixes in Linux Kernel
First published: Tue Dec 19 2023(Updated: )
A use-after-free vulnerability in the Linux kernel's ipv4: igmp component can be exploited to achieve local privilege escalation. A race condition can be exploited to cause a timer be mistakenly registered on a RCU read locked object which is freed by another thread. We recommend upgrading past commit e2b706c691905fe78468c361aaabc719d0a496f1.
Credit: cve-coordination@google.com cve-coordination@google.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=2.6.12<6.7 | |
| 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 6.1.133-1 6.12.22-1 6.12.25-1 |
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://chromereleases.googleblog.com/2024/02/stable-channel-update-for-chromeos.html (Advisory)
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=e2b706c691905fe78468c361aaabc719d0a496f1
- https://kernel.dance/e2b706c691905fe78468c361aaabc719d0a496f1
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
- https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html
- http://packetstormsecurity.com/files/177029/Kernel-Live-Patch-Security-Notice-LSN-0100-1.html
- https://launchpad.net/bugs/cve/CVE-2023-6932
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2255288
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2258584
- https://access.redhat.com/errata/RHSA-2024:0725
- https://access.redhat.com/errata/RHSA-2024:0723
- https://access.redhat.com/errata/RHSA-2024:0724
- https://access.redhat.com/errata/RHSA-2024:1250
- https://access.redhat.com/errata/RHSA-2024:1306
- https://access.redhat.com/errata/RHSA-2024:1404
- https://access.redhat.com/errata/RHSA-2024:2394
- https://access.redhat.com/errata/RHSA-2024:2950
- https://access.redhat.com/errata/RHSA-2024:3138
- https://bugzilla.redhat.com/show_bug.cgi?id=2255283
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6932
- https://nvd.nist.gov/vuln/detail/CVE-2023-6932
- https://security-tracker.debian.org/tracker/CVE-2023-6932
- https://ubuntu.com/security/CVE-2023-6932
- https://git.kernel.org/linus/e2b706c691905fe78468c361aaabc719d0a496f1
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2023-6932?
CVE-2023-6932 is considered to have a high severity due to its potential for local privilege escalation.
How do I fix CVE-2023-6932?
To fix CVE-2023-6932, users should update their Linux kernel to a version that is not vulnerable, such as 5.10.223-1, 5.10.226-1, or later versions.
Which Linux kernel versions are affected by CVE-2023-6932?
CVE-2023-6932 affects Linux kernel versions from 2.6.12 up to, but not including, 6.7.
Is IBM QRadar SIEM affected by CVE-2023-6932?
Yes, IBM QRadar SIEM versions up to 7.5.0 UP8 IF01 are affected by CVE-2023-6932.
What type of vulnerability is CVE-2023-6932?
CVE-2023-6932 is a use-after-free vulnerability found in the Linux kernel's ipv4: igmp component.
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