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Vulnerability · Published Sep 12, 2023 · Assigned by Google

CVE-2023-4921Use-after-free in Linux kernel's net/sched: sch_qfq component

High 7.8

In plain English

A high-severity use-after-free in Kernel from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.4%top 63.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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(). We recommend upgrading past commit 8fc134fee27f2263988ae38920bc03da416b03d8.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-abi-stablelists4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-core4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-cross-headers4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-debug4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-debug-core4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-debug-devel4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-debug-modules4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-debug-modules-extra4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-devel4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-doc4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-modules4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-modules-extra4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-tools4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-tools-libs4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-tools-libs-devel4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-zfcpdump4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-zfcpdump-core4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-zfcpdump-devel4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-zfcpdump-modules4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8perf4.18.0-513.18.1.el8_9ALSA-2024:0897
AlmaLinux:8python3-perf4.18.0-513.18.1.el8_9ALSA-2024:0897
Debian:12linux6.1.55-1DEBIAN-CVE-2023-4921
Debian:13linux6.5.6-1DEBIAN-CVE-2023-4921
Debian:14linux6.5.6-1DEBIAN-CVE-2023-4921
Ubuntu:22.04:LTSlinux5.15.0-87.97UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux5.15.0-87.97USN-6446-1
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-aws5.15.0-1048.53UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-aws5.15.0-1048.53USN-6446-1
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-aws-6.26.2.0-1014.14~22.04.1USN-6444-1
Ubuntu:22.04:LTSlinux-aws-6.26.2.0-1014.14~22.04.1UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-azure5.15.0-1050.57USN-6446-1
Ubuntu:22.04:LTSlinux-azure5.15.0-1050.57UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-azure-6.26.2.0-1015.15~22.04.1UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-azure-6.26.2.0-1015.15~22.04.1USN-6444-1
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1050.57.1UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1050.57.1USN-6446-1
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-azure-fde-6.26.2.0-1015.15~22.04.1.1UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-azure-fde-6.26.2.0-1015.15~22.04.1.1USN-6444-1
Ubuntu:22.04:LTSlinux-gcp5.15.0-1045.53USN-6446-1
Ubuntu:22.04:LTSlinux-gcp5.15.0-1045.53UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-gcp-6.26.2.0-1017.19~22.04.1UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-gcp-6.26.2.0-1017.19~22.04.1USN-6444-1
Ubuntu:22.04:LTSlinux-gke5.15.0-1045.50USN-6446-1
Ubuntu:22.04:LTSlinux-gke5.15.0-1045.50UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1031.37USN-6446-1
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1031.37UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-hwe-6.26.2.0-35.35~22.04.1USN-6444-1
Ubuntu:22.04:LTSlinux-hwe-6.26.2.0-35.35~22.04.1UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-ibm5.15.0-1041.44UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-ibm5.15.0-1041.44USN-6446-1
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1043.49USN-6445-1
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1043.49UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-kvm5.15.0-1045.50USN-6446-1
Ubuntu:22.04:LTSlinux-kvm5.15.0-1045.50UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-87.96USN-6446-1
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-87.96UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.26.2.0-1015.15~22.04.1USN-6444-1
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.26.2.0-1015.15~22.04.1UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1039.39USN-6446-1
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1039.39UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-nvidia-6.26.2.0-1011.11UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-nvidia-6.26.2.0-1011.11USN-6466-1
Ubuntu:22.04:LTSlinux-nvidia-6.56.5.0-1007.7UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1019.19UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1006.6UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-oem-6.16.1.0-1025.25UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-oem-6.16.1.0-1025.25USN-6461-1
Ubuntu:22.04:LTSlinux-oem-6.56.5.0-1007.7USN-6479-1
Ubuntu:22.04:LTSlinux-oem-6.56.5.0-1007.7UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-oracle5.15.0-1046.52UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-oracle5.15.0-1046.52USN-6446-1
Ubuntu:22.04:LTSlinux-raspi5.15.0-1041.44USN-6446-1
Ubuntu:22.04:LTSlinux-raspi5.15.0-1041.44UBUNTU-CVE-2023-4921
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-starfive-6.26.2.0-1007.8~22.04.1UBUNTU-CVE-2023-4921
Ubuntu:22.04:LTSlinux-starfive-6.26.2.0-1007.8~22.04.1USN-6444-2
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1025.29UBUNTU-CVE-2023-4921

Affected products (as reported)

VendorProductVersions
Linux Kernel 3.8 – before 6.6

Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References