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Vulnerability · Published Jul 21, 2023 · Assigned by Google

CVE-2023-3609Use-after-free in Linux kernel's net/sched: cls_u32 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 0.5% (higher than 42% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.5%top 57.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack tooling1Public PoC

Official description

A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation. If tcf_change_indev() fails, u32_set_parms() will immediately return an error after incrementing or decrementing the reference counter in tcf_bind_filter(). If an attacker can control the reference counter and set it to zero, they can cause the reference to be freed, leading to a use-after-free vulnerability. We recommend upgrading past commit 04c55383fa5689357bcdd2c8036725a55ed632bc.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-abi-stablelists4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-core4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-cross-headers4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-debug4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-debug-core4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-debug-devel4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-debug-modules4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-debug-modules-extra4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-devel4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-doc4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-headers4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-modules4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-modules-extra4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-tools4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-tools-libs4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-tools-libs-devel4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-zfcpdump4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-zfcpdump-core4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-zfcpdump-devel4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-zfcpdump-modules4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8perf4.18.0-513.5.1.el8_9ALSA-2023:7077
AlmaLinux:8python3-perf4.18.0-513.5.1.el8_9ALSA-2023:7077
Debian:12linux6.1.37-1DEBIAN-CVE-2023-3609
Debian:13linux6.3.11-1DEBIAN-CVE-2023-3609
Debian:14linux6.3.11-1DEBIAN-CVE-2023-3609
Ubuntu:22.04:LTSlinux5.15.0-82.91USN-6315-1
Ubuntu:22.04:LTSlinux5.15.0-82.91UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-aws5.15.0-1043.48USN-6315-1
Ubuntu:22.04:LTSlinux-aws5.15.0-1043.48UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-aws-6.26.2.0-1010.10~22.04.1UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-aws-6.26.2.0-1010.10~22.04.1USN-6318-1
Ubuntu:22.04:LTSlinux-azure5.15.0-1045.52UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-azure5.15.0-1045.52USN-6332-1
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1045.52.1USN-6332-1
Ubuntu:22.04:LTSlinux-azure-fde5.15.0-1045.52.1UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-gcp5.15.0-1040.48UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-gcp5.15.0-1040.48USN-6315-1
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-gke5.15.0-1040.45USN-6315-1
Ubuntu:22.04:LTSlinux-gke5.15.0-1040.45UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1026.31UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-gkeop5.15.0-1026.31USN-6315-1
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-hwe-6.26.2.0-31.31~22.04.1UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-hwe-6.26.2.0-31.31~22.04.1USN-6318-1
Ubuntu:22.04:LTSlinux-ibm5.15.0-1036.39USN-6315-1
Ubuntu:22.04:LTSlinux-ibm5.15.0-1036.39UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1038.43UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-intel-iotg5.15.0-1038.43USN-6325-1
Ubuntu:22.04:LTSlinux-kvm5.15.0-1040.45USN-6315-1
Ubuntu:22.04:LTSlinux-kvm5.15.0-1040.45UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-82.91USN-6315-1
Ubuntu:22.04:LTSlinux-lowlatency5.15.0-82.91UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.26.2.0-1011.11~22.04.1USN-6318-1
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.26.2.0-1011.11~22.04.1UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1031.31UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-nvidia5.15.0-1031.31USN-6315-1
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-nvidia-tegra5.15.0-1017.17UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-nvidia-tegra-igx5.15.0-1004.4UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-oem-6.06.0.0-1021.21USN-6385-1
Ubuntu:22.04:LTSlinux-oem-6.06.0.0-1021.21UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-oem-6.16.1.0-1019.19USN-6285-1
Ubuntu:22.04:LTSlinux-oem-6.16.1.0-1019.19UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-oracle5.15.0-1041.47USN-6315-1
Ubuntu:22.04:LTSlinux-oracle5.15.0-1041.47UBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-raspi5.15.0-1036.39USN-6348-1
Ubuntu:22.04:LTSlinux-raspi5.15.0-1036.39UBUNTU-CVE-2023-3609
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2023-3609
Ubuntu:22.04:LTSlinux-xilinx-zynqmp5.15.0-1025.29UBUNTU-CVE-2023-3609

Affected products (as reported)

VendorProductVersions
Linux Kernel 4.14.0 – before 4.14.3224.15.0 – before 4.19.2914.20.0 – before 5.4.2485.5.0 – before 5.10.1855.11.0 – before 5.15.1185.16.0 – before 6.1.356.2.0 – before 6.3.9

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

References