CVE-2023-6817: Fixes in Linux Kernel
First published: Mon Dec 18 2023(Updated: )
A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation. The function nft_pipapo_walk did not skip inactive elements during set walk which could lead double deactivations of PIPAPO (Pile Packet Policies) elements, leading to use-after-free. We recommend upgrading past commit 317eb9685095678f2c9f5a8189de698c5354316a.
Credit: cve-coordination@google.com cve-coordination@google.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| IBM Security Verify Governance, Identity Manager software component | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager virtual appliance component | <=ISVG 10.0.2 | |
| Linux Kernel | >=5.6<5.10.204 | |
| Linux Kernel | >=5.11<5.15.143 | |
| Linux Kernel | >=5.16<6.1.68 | |
| Linux Kernel | >=6.2<6.6.7 | |
| Linux Kernel | =6.7-rc1 | |
| Linux Kernel | =6.7-rc2 | |
| Linux Kernel | =6.7-rc3 | |
| Linux Kernel | =6.7-rc4 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.13-1 | |
| >=5.6<5.10.204 | ||
| >=5.11<5.15.143 | ||
| >=5.16<6.1.68 | ||
| >=6.2<6.6.7 | ||
| =6.7-rc1 | ||
| =6.7-rc2 | ||
| =6.7-rc3 | ||
| =6.7-rc4 |
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)
- http://packetstormsecurity.com/files/177029/Kernel-Live-Patch-Security-Notice-LSN-0100-1.html
- http://www.openwall.com/lists/oss-security/2023/12/22/13
- http://www.openwall.com/lists/oss-security/2023/12/22/6
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=317eb9685095678f2c9f5a8189de698c5354316a
- https://kernel.dance/317eb9685095678f2c9f5a8189de698c5354316a
- https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html
- https://launchpad.net/bugs/cve/CVE-2023-6817
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2255140
- https://access.redhat.com/errata/RHSA-2024:0724
- https://access.redhat.com/errata/RHSA-2024:0881
- https://access.redhat.com/errata/RHSA-2024:0897
- https://access.redhat.com/errata/RHSA-2024:1019
- https://access.redhat.com/errata/RHSA-2024:1018
- https://access.redhat.com/errata/RHSA-2024:1248
- https://access.redhat.com/errata/RHSA-2024:1268
- https://access.redhat.com/errata/RHSA-2024:1269
- https://access.redhat.com/errata/RHSA-2024:1367
- https://access.redhat.com/errata/RHSA-2024:1382
- https://access.redhat.com/errata/RHSA-2024:1404
- https://access.redhat.com/errata/RHSA-2024:3414
- https://access.redhat.com/errata/RHSA-2024:3421
- https://bugzilla.redhat.com/show_bug.cgi?id=2255139
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6817
- https://nvd.nist.gov/vuln/detail/CVE-2023-6817
- https://security-tracker.debian.org/tracker/CVE-2023-6817
- https://ubuntu.com/security/CVE-2023-6817
- https://git.kernel.org/linus/317eb9685095678f2c9f5a8189de698c5354316a
- https://www.openwall.com/lists/oss-security/2023/12/22/6
- https://www.ibm.com/support/pages/node/7172423 (Advisory)
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2023-6817?
CVE-2023-6817 has a high severity level due to its potential for local privilege escalation.
How do I fix CVE-2023-6817?
To fix CVE-2023-6817, update to the recommended Linux kernel versions or later as specified in the vulnerability details.
Which systems are affected by CVE-2023-6817?
CVE-2023-6817 affects multiple versions of the Linux kernel and specific IBM Security Verify Governance products.
What exploitation method is associated with CVE-2023-6817?
CVE-2023-6817 can be exploited via a use-after-free condition in the nf_tables component of the Linux kernel.
What are the consequences of CVE-2023-6817 if exploited?
Exploitation of CVE-2023-6817 can lead to local privilege escalation, allowing unauthorized users to gain elevated access to the system.
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