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 Linux kernel | >=2.6.12<6.7 | |
| ubuntu/linux | <4.15.0-221.232 | 4.15.0-221.232 |
| ubuntu/linux | <5.4.0-170.188 | 5.4.0-170.188 |
| 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 | <3.13.0-195.246 | 3.13.0-195.246 |
| ubuntu/linux | <4.4.0-250.284 | 4.4.0-250.284 |
| ubuntu/linux-aws | <4.15.0-1164.177 | 4.15.0-1164.177 |
| ubuntu/linux-aws | <5.4.0-1117.127 | 5.4.0-1117.127 |
| 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 | <4.4.0-1127.133 | 4.4.0-1127.133 |
| ubuntu/linux-aws | <4.4.0-1165.180 | 4.4.0-1165.180 |
| ubuntu/linux-aws-5.15 | <5.15.0-1052.57~20.04.1 | 5.15.0-1052.57~20.04.1 |
| ubuntu/linux-aws-5.4 | <5.4.0-1117.127~18.04.1 | 5.4.0-1117.127~18.04.1 |
| ubuntu/linux-aws-6.2 | <6.2.0-1018.18~22.04.1 | 6.2.0-1018.18~22.04.1 |
| ubuntu/linux-aws-hwe | <4.15.0-1164.177~16.04.1 | 4.15.0-1164.177~16.04.1 |
| ubuntu/linux-azure | <5.4.0-1122.129 | 5.4.0-1122.129 |
| 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 | <4.15.0-1173.188~14.04.1 | 4.15.0-1173.188~14.04.1 |
| ubuntu/linux-azure | <4.15.0-1173.188~16.04.1 | 4.15.0-1173.188~16.04.1 |
| ubuntu/linux-azure-4.15 | <4.15.0-1173.188 | 4.15.0-1173.188 |
| ubuntu/linux-azure-5.15 | <5.15.0-1054.62~20.04.1 | 5.15.0-1054.62~20.04.1 |
| ubuntu/linux-azure-5.4 | <5.4.0-1122.129~18.04.1 | 5.4.0-1122.129~18.04.1 |
| 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 | 5.15.0-1054.62 |
| ubuntu/linux-azure-fde-5.15 | <5.15.0-1054.62~20.04.1 | 5.15.0-1054.62~20.04.1 |
| 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-bluefield | <5.4.0-1077.83 | 5.4.0-1077.83 |
| ubuntu/linux-gcp | <5.4.0-1121.130 | 5.4.0-1121.130 |
| 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 | <4.15.0-1158.175~16.04.1 | 4.15.0-1158.175~16.04.1 |
| ubuntu/linux-gcp-4.15 | <4.15.0-1158.175 | 4.15.0-1158.175 |
| ubuntu/linux-gcp-5.15 | <5.15.0-1049.57~20.04.1 | 5.15.0-1049.57~20.04.1 |
| ubuntu/linux-gcp-5.4 | <5.4.0-1121.130~18.04.1 | 5.4.0-1121.130~18.04.1 |
| 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 | <5.4.0-1084.88 | 5.4.0-1084.88 |
| 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 | <4.15.0-221.232~16.04.1 | 4.15.0-221.232~16.04.1 |
| ubuntu/linux-hwe-5.15 | <5.15.0-92.102~20.04.1 | 5.15.0-92.102~20.04.1 |
| ubuntu/linux-hwe-5.4 | <5.4.0-170.188~18.04.1 | 5.4.0-170.188~18.04.1 |
| ubuntu/linux-hwe-6.5 | <6.5.0-15.15~22.04.1 | 6.5.0-15.15~22.04.1 |
| ubuntu/linux-ibm | <5.4.0-1064.69 | 5.4.0-1064.69 |
| 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-ibm-5.4 | <5.4.0-1064.69~18.04.1 | 5.4.0-1064.69~18.04.1 |
| 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-iot | <5.4.0-1029.30 | 5.4.0-1029.30 |
| ubuntu/linux-kvm | <4.15.0-1148.153 | 4.15.0-1148.153 |
| ubuntu/linux-kvm | <5.4.0-1105.112 | 5.4.0-1105.112 |
| ubuntu/linux-kvm | <5.15.0-1049.54 | 5.15.0-1049.54 |
| ubuntu/linux-kvm | <4.4.0-1128.138 | 4.4.0-1128.138 |
| 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-lts-xenial | <4.4.0-250.284~14.04.1 | 4.4.0-250.284~14.04.1 |
| 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 | <6.1.0-1033.33 | 6.1.0-1033.33 |
| ubuntu/linux-oem-6.5 | <6.5.0-1013.14 | 6.5.0-1013.14 |
| ubuntu/linux-oracle | <4.15.0-1127.138 | 4.15.0-1127.138 |
| ubuntu/linux-oracle | <5.4.0-1116.125 | 5.4.0-1116.125 |
| 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 | <4.15.0-1127.138~16.04.1 | 4.15.0-1127.138~16.04.1 |
| ubuntu/linux-oracle-5.15 | <5.15.0-1050.56~20.04.1 | 5.15.0-1050.56~20.04.1 |
| ubuntu/linux-oracle-5.4 | <5.4.0-1116.125~18.04.1 | 5.4.0-1116.125~18.04.1 |
| ubuntu/linux-raspi | <5.4.0-1101.113 | 5.4.0-1101.113 |
| 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-raspi-5.4 | <5.4.0-1101.113~18.04.1 | 5.4.0-1101.113~18.04.1 |
| 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 | <5.4.0-1036.40 | 5.4.0-1036.40 |
| 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=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://git.kernel.org/linus/e2b706c691905fe78468c361aaabc719d0a496f1 (6.7-rc4)
- https://ubuntu.com/security/notices/USN-6601-1
- https://ubuntu.com/security/notices/USN-6602-1
- https://ubuntu.com/security/notices/USN-6603-1
- https://ubuntu.com/security/notices/USN-6604-1
- https://ubuntu.com/security/notices/USN-6605-1
- 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-6604-2
- https://ubuntu.com/security/notices/USN-6605-2
- 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://ubuntu.com/security/notices/USN-6639-1
- https://www.cve.org/CVERecord?id=CVE-2023-6932
- https://nvd.nist.gov/vuln/detail/CVE-2023-6932
- https://security-tracker.debian.org/tracker/CVE-2023-6932
- https://git.kernel.org/linus/1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
- https://git.kernel.org/linus/e2b706c691905fe78468c361aaabc719d0a496f1
- https://ubuntu.com/security/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://bugzilla.redhat.com/show_bug.cgi?id=2255283
Parent vulnerabilities
(Appears in the following advisories)
Peer vulnerabilities
(Found alongside the following vulnerabilities)
- agent/type
- agent/remedy
- agent/first-publish-date
- agent/author
- collector/epss-latest
- source/FIRST
- agent/epss
- agent/description
- collector/chrome-releases
- agent/severity
- 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
- agent/event
- agent/last-modified-date
- collector/usn-cve
- source/Ubuntu
- agent/references
- agent/tags
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2023-6932
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/2.6.12
- package-manager/ubuntu
- package-manager/debian