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 |
|---|---|---|
| Linux Linux kernel | >=5.6<5.10.204 | |
| Linux Linux kernel | >=5.11<5.15.143 | |
| Linux Linux kernel | >=5.16<6.1.68 | |
| Linux Linux kernel | >=6.2<6.6.7 | |
| Linux Linux kernel | =6.7-rc1 | |
| Linux Linux kernel | =6.7-rc2 | |
| Linux Linux kernel | =6.7-rc3 | |
| Linux Linux kernel | =6.7-rc4 | |
| IBM QRadar SIEM | <=7.5 - 7.5.0 UP8 IF01 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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://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://exchange.xforce.ibmcloud.com/vulnerabilities/275424
- https://www.ibm.com/support/pages/node/7150684 (Advisory)
- 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://git.kernel.org/linus/317eb9685095678f2c9f5a8189de698c5354316a
- https://www.openwall.com/lists/oss-security/2023/12/22/6
- https://security-tracker.debian.org/tracker/CVE-2023-6817
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6817
- https://nvd.nist.gov/vuln/detail/CVE-2023-6817
- https://ubuntu.com/security/CVE-2023-6817
Peer vulnerabilities
(Found alongside the following vulnerabilities)
- collector/oss-sec
- alias/CVE-2023-6817
- agent/type
- agent/remedy
- agent/first-publish-date
- agent/author
- collector/epss-latest
- source/FIRST
- agent/epss
- collector/chrome-releases
- agent/title
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- agent/weakness
- collector/nvd-cve
- collector/launchpad-cve
- source/Launchpad
- agent/severity
- agent/description
- agent/event
- collector/ibm-support
- source/IBM
- collector/redhat-bugzilla
- source/Red Hat
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/references
- agent/tags
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- collector/usn-cve
- source/Ubuntu
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/5.6
- version/linux linux kernel/5.11
- version/linux linux kernel/5.16
- version/linux linux kernel/6.2
- version/linux linux kernel/6.7-rc1
- version/linux linux kernel/6.7-rc2
- version/linux linux kernel/6.7-rc3
- version/linux linux kernel/6.7-rc4
- vendor/ibm
- canonical/ibm qradar siem
- version/ibm qradar siem/7.5 - 7.5.0 up8 if01
- package-manager/debian