CVE-2023-23454
First published: Sun Jan 01 2023(Updated: )
cbq_classify in net/sched/sch_cbq.c in the Linux kernel through 6.1.4 allows attackers to cause a denial of service (slab-out-of-bounds read) because of type confusion (non-negative numbers can sometimes indicate a TC_ACT_SHOT condition rather than valid classification results).
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-477.10.1.rt7.274.el8_8 | 0:4.18.0-477.10.1.rt7.274.el8_8 |
| redhat/kernel | <0:4.18.0-477.10.1.el8_8 | 0:4.18.0-477.10.1.el8_8 |
| Linux Linux kernel | >=2.6.12<=6.1.4 | |
| Debian Debian Linux | =11.0 | |
| redhat/kernel | <6.2 | 6.2 |
| ubuntu/linux | <5.4.0-144.161 | 5.4.0-144.161 |
| ubuntu/linux | <5.15.0-69.76 | 5.15.0-69.76 |
| ubuntu/linux | <5.19.0-42.43 | 5.19.0-42.43 |
| ubuntu/linux | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-aws | <5.4.0-1097.105 | 5.4.0-1097.105 |
| ubuntu/linux-aws | <5.15.0-1033.37 | 5.15.0-1033.37 |
| ubuntu/linux-aws | <5.19.0-1025.26 | 5.19.0-1025.26 |
| ubuntu/linux-aws | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-aws-5.0 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-aws-5.15 | <5.15.0-1033.37~20.04.1 | 5.15.0-1033.37~20.04.1 |
| ubuntu/linux-aws-5.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-aws-5.4 | <5.4.0-1097.105~18.04.1 | 5.4.0-1097.105~18.04.1 |
| ubuntu/linux-aws-5.4 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-aws-6.5 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-aws-fips | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-aws-hwe | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-azure | <5.4.0-1104.110 | 5.4.0-1104.110 |
| ubuntu/linux-azure | <5.15.0-1035.42 | 5.15.0-1035.42 |
| ubuntu/linux-azure | <5.19.0-1026.29 | 5.19.0-1026.29 |
| ubuntu/linux-azure | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-azure-4.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-azure-5.15 | <5.15.0-1035.42~20.04.1 | 5.15.0-1035.42~20.04.1 |
| ubuntu/linux-azure-5.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-azure-5.19 | <5.19.0-1026.29~22.04.1 | 5.19.0-1026.29~22.04.1 |
| ubuntu/linux-azure-5.4 | <5.4.0-1104.110~18.04.1 | 5.4.0-1104.110~18.04.1 |
| ubuntu/linux-azure-5.4 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-azure-6.5 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-azure-edge | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-azure-fde | <5.4.0-1104.110 | 5.4.0-1104.110 |
| ubuntu/linux-azure-fde | <5.15.0-1035.42.1 | 5.15.0-1035.42.1 |
| ubuntu/linux-azure-fde | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-azure-fde-5.15 | <5.15.0-1035.42~20.04.1.1 | 5.15.0-1035.42~20.04.1.1 |
| ubuntu/linux-azure-fde-5.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-azure-fips | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-bluefield | <5.4.0-1059.65 | 5.4.0-1059.65 |
| ubuntu/linux-bluefield | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-dell300x | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-fips | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gcp | <5.4.0-1101.110 | 5.4.0-1101.110 |
| ubuntu/linux-gcp | <5.15.0-1031.38 | 5.15.0-1031.38 |
| ubuntu/linux-gcp | <5.19.0-1024.26 | 5.19.0-1024.26 |
| ubuntu/linux-gcp | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gcp-4.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gcp-5.15 | <5.15.0-1031.38~20.04.1 | 5.15.0-1031.38~20.04.1 |
| ubuntu/linux-gcp-5.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gcp-5.4 | <5.4.0-1101.110~18.04.1 | 5.4.0-1101.110~18.04.1 |
| ubuntu/linux-gcp-5.4 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gcp-6.5 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gcp-fips | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gke | <5.4.0-1095.102 | 5.4.0-1095.102 |
| ubuntu/linux-gke | <5.15.0-1030.35 | 5.15.0-1030.35 |
| ubuntu/linux-gke | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gke-4.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gke-5.0 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gke-5.15 | <5.15.0-1029.34~20.04.1 | 5.15.0-1029.34~20.04.1 |
| ubuntu/linux-gke-5.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gke-5.4 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gkeop | <5.4.0-1065.69 | 5.4.0-1065.69 |
| ubuntu/linux-gkeop | <5.15.0-1017.22 | 5.15.0-1017.22 |
| ubuntu/linux-gkeop | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gkeop-5.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-gkeop-5.4 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-hwe | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-hwe-5.15 | <5.15.0-69.76~20.04.1 | 5.15.0-69.76~20.04.1 |
| ubuntu/linux-hwe-5.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-hwe-5.19 | <5.19.0-42.43~22.04.1 | 5.19.0-42.43~22.04.1 |
| ubuntu/linux-hwe-5.4 | <5.4.0-144.161~18.04.1 | 5.4.0-144.161~18.04.1 |
| ubuntu/linux-hwe-5.4 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-hwe-6.5 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-hwe-edge | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-ibm | <5.4.0-1045.50 | 5.4.0-1045.50 |
| ubuntu/linux-ibm | <5.15.0-1027.30 | 5.15.0-1027.30 |
| ubuntu/linux-ibm | <5.19.0-1022.24 | 5.19.0-1022.24 |
| ubuntu/linux-ibm | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-ibm-5.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-ibm-5.4 | <5.4.0-1045.50~18.04.1 | 5.4.0-1045.50~18.04.1 |
| ubuntu/linux-ibm-5.4 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-intel | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-intel-5.13 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-intel-iotg | <5.15.0-1027.32 | 5.15.0-1027.32 |
| ubuntu/linux-intel-iotg | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-intel-iotg-5.15 | <5.15.0-1027.32~20.04.1 | 5.15.0-1027.32~20.04.1 |
| ubuntu/linux-intel-iotg-5.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-iot | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-kvm | <5.4.0-1087.93 | 5.4.0-1087.93 |
| ubuntu/linux-kvm | <5.15.0-1030.35 | 5.15.0-1030.35 |
| ubuntu/linux-kvm | <5.19.0-1023.24 | 5.19.0-1023.24 |
| ubuntu/linux-kvm | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-laptop | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-lowlatency | <5.15.0-69.76 | 5.15.0-69.76 |
| ubuntu/linux-lowlatency | <5.19.0-1024.25 | 5.19.0-1024.25 |
| ubuntu/linux-lowlatency | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-lowlatency-hwe-5.15 | <5.15.0-69.76~20.04.1 | 5.15.0-69.76~20.04.1 |
| ubuntu/linux-lowlatency-hwe-5.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-lowlatency-hwe-5.19 | <5.19.0-1024.25~22.04.1 | 5.19.0-1024.25~22.04.1 |
| ubuntu/linux-lowlatency-hwe-5.19 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-lowlatency-hwe-6.5 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-lts-xenial | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-nvidia | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-nvidia-6.5 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-nvidia-6.8 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-nvidia-lowlatency | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oem | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oem-5.10 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oem-5.14 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oem-5.17 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oem-5.6 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oem-6.0 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oem-6.1 | <6.1.0-1007.7 | 6.1.0-1007.7 |
| ubuntu/linux-oem-6.1 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oem-6.5 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oem-6.8 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oem-osp1 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oracle | <5.4.0-1094.103 | 5.4.0-1094.103 |
| ubuntu/linux-oracle | <5.15.0-1032.38 | 5.15.0-1032.38 |
| ubuntu/linux-oracle | <5.19.0-1023.26 | 5.19.0-1023.26 |
| ubuntu/linux-oracle | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oracle-5.0 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oracle-5.13 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oracle-5.15 | <5.15.0-1032.38~20.04.1 | 5.15.0-1032.38~20.04.1 |
| ubuntu/linux-oracle-5.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oracle-5.4 | <5.4.0-1094.103~18.04.1 | 5.4.0-1094.103~18.04.1 |
| ubuntu/linux-oracle-5.4 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-oracle-6.5 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-raspi | <5.4.0-1081.92 | 5.4.0-1081.92 |
| ubuntu/linux-raspi | <5.15.0-1026.28 | 5.15.0-1026.28 |
| ubuntu/linux-raspi | <5.19.0-1018.25 | 5.19.0-1018.25 |
| ubuntu/linux-raspi | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-raspi-5.4 | <5.4.0-1081.92~18.04.1 | 5.4.0-1081.92~18.04.1 |
| ubuntu/linux-raspi-5.4 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-raspi2 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-riscv | <5.19.0-1018.19 | 5.19.0-1018.19 |
| ubuntu/linux-riscv | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-riscv-5.15 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-riscv-6.5 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-snapdragon | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-starfive | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-starfive-6.5 | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| ubuntu/linux-xilinx-zynqmp | <6.2~<5.4.229<5.15.87 | 6.2~ 5.4.229 5.15.87 |
| debian/linux | 5.10.218-1 5.10.221-1 6.1.94-1 6.1.99-1 6.9.12-1 6.10.3-1 |
Remedy
The mitigation is to disable unprivileged user namespaces by setting user.max_user_namespaces to 0: ``` # echo "user.max_user_namespaces=0" > /etc/sysctl.d/userns.conf # sysctl -p /etc/sysctl.d/userns.conf ``` It is also possible to prevent the affected code from being loaded by blacklisting the `cbq` kernel module. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2023-23454 https://nvd.nist.gov/vuln/detail/CVE-2023-23454 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=caa4b35b4317d5147b3ab0fbdc9c075c7d2e9c12
- https://bugzilla.redhat.com/show_bug.cgi?id=2168297
- https://access.redhat.com/errata/RHSA-2023:2736
- https://access.redhat.com/errata/RHSA-2023:2951
- https://access.redhat.com/security/cve/cve-2023-23454
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=caa4b35b4317d5147b3ab0fbdc9c075c7d2e9c12
- https://lists.debian.org/debian-lts-announce/2023/03/msg00000.html
- https://lists.debian.org/debian-lts-announce/2023/05/msg00006.html
- https://www.debian.org/security/2023/dsa-5324
- https://www.openwall.com/lists/oss-security/2023/01/10/1
- https://www.openwall.com/lists/oss-security/2023/01/10/4
- https://launchpad.net/bugs/cve/CVE-2023-23454
- https://access.redhat.com/errata/RHSA-2024:0412
- https://git.kernel.org/linus/caa4b35b4317d5147b3ab0fbdc9c075c7d2e9c12
- https://ubuntu.com/security/notices/USN-5915-1
- https://ubuntu.com/security/notices/USN-5917-1
- https://ubuntu.com/security/notices/USN-5934-1
- https://ubuntu.com/security/notices/USN-5939-1
- https://ubuntu.com/security/notices/USN-5940-1
- https://ubuntu.com/security/notices/USN-5951-1
- https://ubuntu.com/security/notices/USN-5982-1
- https://ubuntu.com/security/notices/USN-5987-1
- https://ubuntu.com/security/notices/USN-6000-1
- https://ubuntu.com/security/notices/USN-6004-1
- https://ubuntu.com/security/notices/USN-6079-1
- https://ubuntu.com/security/notices/USN-6091-1
- https://ubuntu.com/security/notices/USN-6096-1
- https://www.cve.org/CVERecord?id=CVE-2023-23454
- https://nvd.nist.gov/vuln/detail/CVE-2023-23454
- https://security-tracker.debian.org/tracker/CVE-2023-23454
- https://git.kernel.org/linus/1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
- https://ubuntu.com/security/CVE-2023-23454
Parent vulnerabilities
(Appears in the following advisories)
- collector/redhat-cve
- collector/nvd-index
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- agent/author
- agent/severity
- agent/remedy
- agent/weakness
- agent/description
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2023-23454
- agent/references
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- collector/usn-cve
- source/Ubuntu
- agent/softwarecombine
- agent/tags
- agent/event
- collector/security-tracker-debian
- source/Debian
- package-manager/redhat
- vendor/linux
- canonical/linux linux kernel
- version/linux linux kernel/2.6.12
- version/linux linux kernel/6.1.4
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/11.0
- package-manager/ubuntu
- package-manager/debian