7.8
CWE
416
Advisory Published
Updated

CVE-2023-4623: Use-after-free in Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component

First published: Wed Sep 06 2023(Updated: )

A use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component can be exploited to achieve local privilege escalation. If a class with a link-sharing curve (i.e. with the HFSC_FSC flag set) has a parent without a link-sharing curve, then init_vf() will call vttree_insert() on the parent, but vttree_remove() will be skipped in update_vf(). This leaves a dangling pointer that can cause a use-after-free. We recommend upgrading past commit b3d26c5702c7d6c45456326e56d2ccf3f103e60f.

Credit: cve-coordination@google.com cve-coordination@google.com cve-coordination@google.com

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel<=2.5.75
Linux Linux kernel=2.6.12-rc1
Linux Linux kernel>=2.6.12<6.6
Debian Debian Linux=10.0
IBM QRadar SIEM<=7.5 - 7.5.0 UP8 IF01
ubuntu/linux<4.15.0-219.230
4.15.0-219.230
ubuntu/linux<5.4.0-165.182
5.4.0-165.182
ubuntu/linux<5.15.0-87.97
5.15.0-87.97
ubuntu/linux<6.2.0-35.35
6.2.0-35.35
ubuntu/linux<3.13.0-194.245
3.13.0-194.245
ubuntu/linux<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux<4.4.0-246.280
4.4.0-246.280
ubuntu/linux-allwinner-5.19<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-aws<4.15.0-1162.175
4.15.0-1162.175
ubuntu/linux-aws<5.4.0-1112.121
5.4.0-1112.121
ubuntu/linux-aws<5.15.0-1048.53
5.15.0-1048.53
ubuntu/linux-aws<6.2.0-1014.14
6.2.0-1014.14
ubuntu/linux-aws<4.4.0-1124.130
4.4.0-1124.130
ubuntu/linux-aws<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-aws<4.4.0-1162.177
4.4.0-1162.177
ubuntu/linux-aws-5.15<5.15.0-1048.53~20.04.1
5.15.0-1048.53~20.04.1
ubuntu/linux-aws-5.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-aws-5.4<5.4.0-1112.121~18.04.2
5.4.0-1112.121~18.04.2
ubuntu/linux-aws-5.4<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-aws-6.2<6.2.0-1014.14~22.04.1
6.2.0-1014.14~22.04.1
ubuntu/linux-aws-6.2<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-aws-6.5<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-aws-fips<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-aws-hwe<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-aws-hwe<4.15.0-1162.175~16.04.1
4.15.0-1162.175~16.04.1
ubuntu/linux-azure<5.4.0-1118.125
5.4.0-1118.125
ubuntu/linux-azure<5.15.0-1050.57
5.15.0-1050.57
ubuntu/linux-azure<6.2.0-1015.15
6.2.0-1015.15
ubuntu/linux-azure<4.15.0-1171.186~14.04.1
4.15.0-1171.186~14.04.1
ubuntu/linux-azure<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-azure<4.15.0-1171.186~16.04.1
4.15.0-1171.186~16.04.1
ubuntu/linux-azure-4.15<4.15.0-1171.186
4.15.0-1171.186
ubuntu/linux-azure-4.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-azure-5.15<5.15.0-1050.57~20.04.1
5.15.0-1050.57~20.04.1
ubuntu/linux-azure-5.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-azure-5.4<5.4.0-1118.125~18.04.1
5.4.0-1118.125~18.04.1
ubuntu/linux-azure-5.4<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-azure-6.2<6.2.0-1015.15~22.04.1
6.2.0-1015.15~22.04.1
ubuntu/linux-azure-6.2<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-azure-6.5<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-azure-fde<5.15.0-1050.57.1
5.15.0-1050.57.1
ubuntu/linux-azure-fde<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-azure-fde-5.15<5.15.0-1050.57~20.04.1.1
5.15.0-1050.57~20.04.1.1
ubuntu/linux-azure-fde-5.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-azure-fde-5.19<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-azure-fde-6.2<6.2.0-1015.15~22.04.1
6.2.0-1015.15~22.04.1
ubuntu/linux-azure-fde-6.2<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-azure-fips<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-bluefield<5.4.0-1073.79
5.4.0-1073.79
ubuntu/linux-bluefield<5.15.0-1028.30
5.15.0-1028.30
ubuntu/linux-bluefield<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-fips<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-gcp<5.4.0-1116.125
5.4.0-1116.125
ubuntu/linux-gcp<5.15.0-1045.53
5.15.0-1045.53
ubuntu/linux-gcp<6.2.0-1017.19
6.2.0-1017.19
ubuntu/linux-gcp<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-gcp<4.15.0-1156.173~16.04.1
4.15.0-1156.173~16.04.1
ubuntu/linux-gcp-4.15<4.15.0-1156.173
4.15.0-1156.173
ubuntu/linux-gcp-4.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-gcp-5.15<5.15.0-1045.53~20.04.2
5.15.0-1045.53~20.04.2
ubuntu/linux-gcp-5.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-gcp-5.19<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-gcp-5.4<5.4.0-1116.125~18.04.1
5.4.0-1116.125~18.04.1
ubuntu/linux-gcp-5.4<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-gcp-6.2<6.2.0-1017.19~22.04.1
6.2.0-1017.19~22.04.1
ubuntu/linux-gcp-6.5<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-gcp-fips<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-gke<5.15.0-1045.50
5.15.0-1045.50
ubuntu/linux-gke<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-gkeop<5.4.0-1079.83
5.4.0-1079.83
ubuntu/linux-gkeop<5.15.0-1031.37
5.15.0-1031.37
ubuntu/linux-gkeop<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-gkeop-5.15<5.15.0-1031.37~20.04.1
5.15.0-1031.37~20.04.1
ubuntu/linux-gkeop-5.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-hwe<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-hwe<4.15.0-219.230~16.04.1
4.15.0-219.230~16.04.1
ubuntu/linux-hwe-5.15<5.15.0-87.97~20.04.1
5.15.0-87.97~20.04.1
ubuntu/linux-hwe-5.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-hwe-5.4<5.4.0-165.182~18.04.1
5.4.0-165.182~18.04.1
ubuntu/linux-hwe-5.4<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-hwe-6.2<6.2.0-35.35~22.04.1
6.2.0-35.35~22.04.1
ubuntu/linux-hwe-6.2<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-hwe-6.5<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-ibm<5.4.0-1059.64
5.4.0-1059.64
ubuntu/linux-ibm<5.15.0-1041.44
5.15.0-1041.44
ubuntu/linux-ibm<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-ibm-5.15<5.15.0-1041.44~20.04.1
5.15.0-1041.44~20.04.1
ubuntu/linux-ibm-5.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-ibm-5.4<5.4.0-1059.64~18.04.1
5.4.0-1059.64~18.04.1
ubuntu/linux-ibm-5.4<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-intel<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-intel-iotg<5.15.0-1043.49
5.15.0-1043.49
ubuntu/linux-intel-iotg<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-intel-iotg-5.15<5.15.0-1043.49~20.04.1
5.15.0-1043.49~20.04.1
ubuntu/linux-intel-iotg-5.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-iot<5.4.0-1024.25
5.4.0-1024.25
ubuntu/linux-iot<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-kvm<4.15.0-1146.151
4.15.0-1146.151
ubuntu/linux-kvm<5.4.0-1101.107
5.4.0-1101.107
ubuntu/linux-kvm<5.15.0-1045.50
5.15.0-1045.50
ubuntu/linux-kvm<6.2.0-1015.15
6.2.0-1015.15
ubuntu/linux-kvm<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-kvm<4.4.0-1125.135
4.4.0-1125.135
ubuntu/linux-laptop<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-lowlatency<5.15.0-87.96
5.15.0-87.96
ubuntu/linux-lowlatency<6.2.0-1015.15
6.2.0-1015.15
ubuntu/linux-lowlatency<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-87.96~20.04.1
5.15.0-87.96~20.04.1
ubuntu/linux-lowlatency-hwe-5.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-lowlatency-hwe-5.19<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-lowlatency-hwe-6.2<6.2.0-1015.15~22.04.1
6.2.0-1015.15~22.04.1
ubuntu/linux-lowlatency-hwe-6.2<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-lowlatency-hwe-6.5<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-lts-xenial<4.4.0-246.280~14.04.1
4.4.0-246.280~14.04.1
ubuntu/linux-lts-xenial<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-nvidia<5.15.0-1039.39
5.15.0-1039.39
ubuntu/linux-nvidia<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-nvidia-6.2<6.2.0-1011.11
6.2.0-1011.11
ubuntu/linux-nvidia-6.2<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-nvidia-6.5<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-oem-5.17<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-oem-6.0<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-oem-6.1<6.1.0-1023.23
6.1.0-1023.23
ubuntu/linux-oem-6.1<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-oem-6.5<6.5.0-1004.4
6.5.0-1004.4
ubuntu/linux-oem-6.5<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-oem-6.8<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-oracle<4.15.0-1125.136
4.15.0-1125.136
ubuntu/linux-oracle<5.4.0-1111.120
5.4.0-1111.120
ubuntu/linux-oracle<5.15.0-1046.52
5.15.0-1046.52
ubuntu/linux-oracle<6.2.0-1014.14
6.2.0-1014.14
ubuntu/linux-oracle<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-oracle<4.15.0-1125.136~16.04.1
4.15.0-1125.136~16.04.1
ubuntu/linux-oracle-5.15<5.15.0-1046.52~20.04.1
5.15.0-1046.52~20.04.1
ubuntu/linux-oracle-5.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-oracle-5.4<5.4.0-1111.120~18.04.1
5.4.0-1111.120~18.04.1
ubuntu/linux-oracle-5.4<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-oracle-6.5<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-raspi<5.4.0-1096.107
5.4.0-1096.107
ubuntu/linux-raspi<5.15.0-1041.44
5.15.0-1041.44
ubuntu/linux-raspi<6.2.0-1015.17
6.2.0-1015.17
ubuntu/linux-raspi<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-raspi-5.4<5.4.0-1096.107~18.04.1
5.4.0-1096.107~18.04.1
ubuntu/linux-raspi-5.4<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-riscv<6.2.0-35.35.1
6.2.0-35.35.1
ubuntu/linux-riscv<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-riscv-5.15<5.15.0-1044.48~20.04.1
5.15.0-1044.48~20.04.1
ubuntu/linux-riscv-5.15<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-riscv-6.5<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-starfive<6.2.0-1007.8
6.2.0-1007.8
ubuntu/linux-starfive<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-starfive-6.2<6.2.0-1007.8~22.04.1
6.2.0-1007.8~22.04.1
ubuntu/linux-starfive-6.2<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-starfive-6.5<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
ubuntu/linux-xilinx-zynqmp<5.4.0-1032.36
5.4.0-1032.36
ubuntu/linux-xilinx-zynqmp<5.15.0-1025.29
5.15.0-1025.29
ubuntu/linux-xilinx-zynqmp<6.6~<5.4.257<5.15.132<6.5.3
6.6~
5.4.257
5.15.132
6.5.3
debian/linux
5.10.218-1
5.10.221-1
6.1.94-1
6.1.99-1
6.9.8-1
6.9.9-1

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Reference Links

Frequently Asked Questions

  • What is CVE-2023-4623?

    CVE-2023-4623 is a use-after-free vulnerability in the Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) component that can be exploited to achieve local privilege escalation.

  • How can CVE-2023-4623 be exploited?

    CVE-2023-4623 can be exploited by a local attacker to achieve privilege escalation.

  • What software is affected by CVE-2023-4623?

    The Linux kernel versions up to and including 2.5.75 and version 2.6.12-rc1 are affected by CVE-2023-4623.

  • What is the severity of CVE-2023-4623?

    CVE-2023-4623 has a severity rating of 7.8 (high).

  • How can I fix CVE-2023-4623?

    To fix CVE-2023-4623, it is recommended to update to a patched version of the Linux kernel.

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2024 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203