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 | |
| ubuntu/linux | <5.15.0-92.102 | 5.15.0-92.102 |
| ubuntu/linux | <6.5.0-15.15 | 6.5.0-15.15 |
| ubuntu/linux-aws | <5.15.0-1052.57 | 5.15.0-1052.57 |
| ubuntu/linux-aws | <6.5.0-1012.12 | 6.5.0-1012.12 |
| ubuntu/linux-aws-5.15 | <5.15.0-1052.57~20.04.1 | 5.15.0-1052.57~20.04.1 |
| ubuntu/linux-aws-6.2 | <6.2.0-1018.18~22.04.1 | 6.2.0-1018.18~22.04.1 |
| ubuntu/linux-azure | <5.15.0-1054.62 | 5.15.0-1054.62 |
| ubuntu/linux-azure | <6.5.0-1011.11 | 6.5.0-1011.11 |
| ubuntu/linux-azure-5.15 | <5.15.0-1054.62~20.04.1 | 5.15.0-1054.62~20.04.1 |
| ubuntu/linux-azure-6.2 | <6.2.0-1019.19~22.04.1 | 6.2.0-1019.19~22.04.1 |
| ubuntu/linux-azure-fde | <5.15.0-1054.62.1 | 5.15.0-1054.62.1 |
| ubuntu/linux-azure-fde-5.15 | <5.15.0-1054.62~20.04.1.1 | 5.15.0-1054.62~20.04.1.1 |
| ubuntu/linux-azure-fde-6.2 | <6.2.0-1019.19~22.04.1.1 | 6.2.0-1019.19~22.04.1.1 |
| ubuntu/linux-gcp | <5.15.0-1049.57 | 5.15.0-1049.57 |
| ubuntu/linux-gcp | <6.5.0-1011.11 | 6.5.0-1011.11 |
| ubuntu/linux-gcp-5.15 | <5.15.0-1049.57~20.04.1 | 5.15.0-1049.57~20.04.1 |
| ubuntu/linux-gcp-6.2 | <6.2.0-1021.23~22.04.1 | 6.2.0-1021.23~22.04.1 |
| ubuntu/linux-gke | <5.15.0-1049.54 | 5.15.0-1049.54 |
| ubuntu/linux-gkeop | <5.15.0-1035.41 | 5.15.0-1035.41 |
| ubuntu/linux-gkeop-5.15 | <5.15.0-1035.41~20.04.1 | 5.15.0-1035.41~20.04.1 |
| ubuntu/linux-hwe-5.15 | <5.15.0-92.102~20.04.1 | 5.15.0-92.102~20.04.1 |
| ubuntu/linux-hwe-6.5 | <6.5.0-15.15~22.04.1 | 6.5.0-15.15~22.04.1 |
| ubuntu/linux-ibm | <5.15.0-1045.48 | 5.15.0-1045.48 |
| ubuntu/linux-ibm-5.15 | <5.15.0-1045.48~20.04.1 | 5.15.0-1045.48~20.04.1 |
| ubuntu/linux-intel-iotg | <5.15.0-1047.53 | 5.15.0-1047.53 |
| ubuntu/linux-intel-iotg-5.15 | <5.15.0-1048.54~20.04.1 | 5.15.0-1048.54~20.04.1 |
| ubuntu/linux-kvm | <5.15.0-1049.54 | 5.15.0-1049.54 |
| ubuntu/linux-laptop | <6.5.0-1008.11 | 6.5.0-1008.11 |
| ubuntu/linux-lowlatency | <6.5.0-15.15.1 | 6.5.0-15.15.1 |
| ubuntu/linux-lowlatency-hwe-5.15 | <5.15.0-92.102~20.04.1 | 5.15.0-92.102~20.04.1 |
| ubuntu/linux-lowlatency-hwe-6.5 | <6.5.0-15.15.1.1~22.04.1 | 6.5.0-15.15.1.1~22.04.1 |
| ubuntu/linux-nvidia | <5.15.0-1043.43 | 5.15.0-1043.43 |
| ubuntu/linux-nvidia-6.2 | <6.2.0-1015.15 | 6.2.0-1015.15 |
| ubuntu/linux-oem-6.1 | <6.1.0-1029.29 | 6.1.0-1029.29 |
| ubuntu/linux-oem-6.5 | <6.5.0-1013.14 | 6.5.0-1013.14 |
| ubuntu/linux-oracle | <5.15.0-1050.56 | 5.15.0-1050.56 |
| ubuntu/linux-oracle | <6.5.0-1014.14 | 6.5.0-1014.14 |
| ubuntu/linux-oracle-5.15 | <5.15.0-1050.56~20.04.1 | 5.15.0-1050.56~20.04.1 |
| ubuntu/linux-raspi | <5.15.0-1045.48 | 5.15.0-1045.48 |
| ubuntu/linux-raspi | <6.5.0-1009.12 | 6.5.0-1009.12 |
| ubuntu/linux-riscv | <6.5.0-15.15.1 | 6.5.0-15.15.1 |
| ubuntu/linux-riscv-5.15 | <5.15.0-1048.52~20.04.1 | 5.15.0-1048.52~20.04.1 |
| ubuntu/linux-starfive | <6.5.0-1006.7 | 6.5.0-1006.7 |
| ubuntu/linux-xilinx-zynqmp | <5.15.0-1027.31 | 5.15.0-1027.31 |
| debian/linux | 4.19.249-2 4.19.304-1 5.10.209-2 5.10.216-1 6.1.76-1 6.1.90-1 6.7.12-1 | |
| debian/linux-5.10 | 5.10.216-1~deb10u1 |
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=317eb9685095678f2c9f5a8189de698c5354316a
- https://kernel.dance/317eb9685095678f2c9f5a8189de698c5354316a
- http://www.openwall.com/lists/oss-security/2023/12/22/6
- http://www.openwall.com/lists/oss-security/2023/12/22/13
- 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-2023-6817
- 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://exchange.xforce.ibmcloud.com/vulnerabilities/275424
- https://www.ibm.com/support/pages/node/7144861 (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://bugzilla.redhat.com/show_bug.cgi?id=2255139
- https://kernel.dance/#317eb9685095678f2c9f5a8189de698c5354316a
- https://ubuntu.com/security/notices/USN-6606-1
- https://ubuntu.com/security/notices/USN-6607-1
- https://ubuntu.com/security/notices/USN-6608-1
- https://ubuntu.com/security/notices/USN-6609-1
- https://ubuntu.com/security/notices/USN-6609-2
- https://ubuntu.com/security/notices/USN-6609-3
- https://ubuntu.com/security/notices/USN-6628-1
- https://ubuntu.com/security/notices/USN-6608-2
- https://ubuntu.com/security/notices/USN-6635-1
- https://ubuntu.com/security/notices/USN-6628-2
- https://www.cve.org/CVERecord?id=CVE-2023-6817
- https://nvd.nist.gov/vuln/detail/CVE-2023-6817
- https://git.kernel.org/linus/3c4287f62044a90e73a561aa05fc46e62da173da
- https://ubuntu.com/security/CVE-2023-6817
Parent vulnerabilities
(Appears in the following advisories)
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
- collector/mitre-cve
- source/MITRE
- agent/title
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- agent/weakness
- collector/nvd-cve
- collector/launchpad-cve
- source/Launchpad
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- collector/ibm-support
- source/IBM
- agent/last-modified-date
- agent/severity
- agent/description
- agent/event
- collector/redhat-bugzilla
- source/Red Hat
- agent/tags
- agent/references
- 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
- package-manager/debian
- package-manager/ubuntu