7.8
CWE
416
Advisory Published
Updated

CVE-2023-4921: Use After Free

First published: Tue Sep 12 2023(Updated: )

A flaw in the Linux Kernel found. A use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation. When the plug qdisc is used as a class of the qfq qdisc, sending network packets triggers use-after-free in qfq_dequeue() due to the incorrect .peek handler of sch_plug and lack of error checking in agg_dequeue(). References: <a href="https://github.com/torvalds/linux/commit/8fc134fee27f2263988ae38920bc03da416b03d8">https://github.com/torvalds/linux/commit/8fc134fee27f2263988ae38920bc03da416b03d8</a>

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

Affected SoftwareAffected VersionHow to fix
Linux Linux kernel>=3.8<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<6.5.0-10.10
6.5.0-10.10
ubuntu/linux<3.13.0-197.248
3.13.0-197.248
ubuntu/linux<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux<4.4.0-246.280
4.4.0-246.280
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<6.5.0-1009.9
6.5.0-1009.9
ubuntu/linux-aws<4.4.0-1124.130
4.4.0-1124.130
ubuntu/linux-aws<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-aws-6.5<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-aws-fips<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-aws-hwe<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.0-1008.8
6.5.0-1008.8
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-azure-6.5<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-azure-fde-6.2<6.2.0-1015.15~22.04.1.1
6.2.0-1015.15~22.04.1.1
ubuntu/linux-azure-fde-6.2<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-azure-fips<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-fips<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.0-1008.8
6.5.0-1008.8
ubuntu/linux-gcp<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-gcp-5.19<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-gcp-fips<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-gke<5.15.0-1045.50
5.15.0-1045.50
ubuntu/linux-gke<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-hwe<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-hwe-6.5<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-intel<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-iot<5.4.0-1024.25
5.4.0-1024.25
ubuntu/linux-iot<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-kvm<4.4.0-1125.135
4.4.0-1125.135
ubuntu/linux-laptop<6.5.0-1005.8
6.5.0-1005.8
ubuntu/linux-laptop<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.0-10.10.1
6.5.0-10.10.1
ubuntu/linux-lowlatency<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-lowlatency-hwe-6.5<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-nvidia<5.15.0-1039.39
5.15.0-1039.39
ubuntu/linux-nvidia<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-nvidia-6.5<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-oem-5.17<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-oem-6.0<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-oem-6.1<6.1.0-1025.25
6.1.0-1025.25
ubuntu/linux-oem-6.1<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-oem-6.5<6.5.0-1007.7
6.5.0-1007.7
ubuntu/linux-oem-6.5<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-oem-6.8<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.0-1011.11
6.5.0-1011.11
ubuntu/linux-oracle<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-oracle-6.5<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.0-1006.8
6.5.0-1006.8
ubuntu/linux-raspi<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-riscv-6.5<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-starfive<6.2.0-1007.8
6.2.0-1007.8
ubuntu/linux-starfive<6.5.0-1003.4
6.5.0-1003.4
ubuntu/linux-starfive<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
ubuntu/linux-starfive-6.5<6.6~<5.4.257<5.15.132<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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<6.5.4
6.6~
5.4.257
5.15.132
6.5.4
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

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Reference Links

Frequently Asked Questions

  • What is CVE-2023-4921?

    CVE-2023-4921 is a use-after-free vulnerability in the Linux kernel's net/sched: sch_qfq component that can be exploited to achieve local privilege escalation.

  • How severe is CVE-2023-4921?

    CVE-2023-4921 has a severity rating of 7.8 (high).

  • Which software is affected by CVE-2023-4921?

    CVE-2023-4921 affects the Linux Kernel versions 3.8 to 6.6.

  • How can CVE-2023-4921 be exploited?

    CVE-2023-4921 can be exploited by sending network packets when the plug qdisc is used as a class of the qfq qdisc, triggering a use-after-free vulnerability in qfq_dequeue().

  • Are there any references for CVE-2023-4921?

    Yes, you can find references for CVE-2023-4921 at the following links: [Link 1](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=8fc134fee27f2263988ae38920bc03da416b03d8) and [Link 2](https://kernel.dance/8fc134fee27f2263988ae38920bc03da416b03d8).

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