Vulnerability · Published Sep 6, 2023 · Assigned by Google
CVE-2023-4623Use-after-free in Linux kernel's net/sched: sch_hfsc (HFSC qdisc traffic control) 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 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.3%top 79.1% 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_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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | bpftool | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-abi-stablelists | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-core | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-cross-headers | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-debug | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-debug-core | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-debug-devel | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-debug-modules | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-debug-modules-extra | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-devel | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-doc | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-modules | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-modules-extra | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-tools | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-tools-libs | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-tools-libs-devel | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-zfcpdump | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-zfcpdump-core | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-zfcpdump-devel | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-zfcpdump-modules | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | kernel-zfcpdump-modules-extra | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | perf | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| AlmaLinux:8 | python3-perf | 4.18.0-513.18.1.el8_9 | ALSA-2024:0897 |
| Debian:12 | linux | 6.1.55-1 | DEBIAN-CVE-2023-4623 |
| Debian:13 | linux | 6.5.3-1 | DEBIAN-CVE-2023-4623 |
| Debian:14 | linux | 6.5.3-1 | DEBIAN-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux | 5.15.0-87.97 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux | 5.15.0-87.97 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-allwinner-5.19 | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-aws | 5.15.0-1048.53 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-aws | 5.15.0-1048.53 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-aws-5.19 | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-aws-6.2 | 6.2.0-1014.14~22.04.1 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-aws-6.2 | 6.2.0-1014.14~22.04.1 | USN-6444-1 |
| Ubuntu:22.04:LTS | linux-azure | 5.15.0-1050.57 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-azure | 5.15.0-1050.57 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-azure-5.19 | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-azure-6.2 | 6.2.0-1015.15~22.04.1 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-azure-6.2 | 6.2.0-1015.15~22.04.1 | USN-6444-1 |
| Ubuntu:22.04:LTS | linux-azure-fde | 5.15.0-1050.57.1 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-azure-fde | 5.15.0-1050.57.1 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-azure-fde-5.19 | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.2 | 6.2.0-1015.15~22.04.1.1 | USN-6444-1 |
| Ubuntu:22.04:LTS | linux-gcp | 5.15.0-1045.53 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-gcp | 5.15.0-1045.53 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-gcp-5.19 | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-gcp-6.2 | 6.2.0-1017.19~22.04.1 | USN-6444-1 |
| Ubuntu:22.04:LTS | linux-gcp-6.2 | 6.2.0-1017.19~22.04.1 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-gke | 5.15.0-1045.50 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-gke | 5.15.0-1045.50 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-gkeop | 5.15.0-1031.37 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-gkeop | 5.15.0-1031.37 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-hwe-5.19 | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-hwe-6.2 | 6.2.0-35.35~22.04.1 | USN-6444-1 |
| Ubuntu:22.04:LTS | linux-hwe-6.2 | 6.2.0-35.35~22.04.1 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-ibm | 5.15.0-1041.44 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-ibm | 5.15.0-1041.44 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-intel-iotg | 5.15.0-1043.49 | USN-6445-1 |
| Ubuntu:22.04:LTS | linux-intel-iotg | 5.15.0-1043.49 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-kvm | 5.15.0-1045.50 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-kvm | 5.15.0-1045.50 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-lowlatency | 5.15.0-87.96 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-lowlatency | 5.15.0-87.96 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-5.19 | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.2 | 6.2.0-1015.15~22.04.1 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.2 | 6.2.0-1015.15~22.04.1 | USN-6444-1 |
| Ubuntu:22.04:LTS | linux-nvidia | 5.15.0-1039.39 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-nvidia | 5.15.0-1039.39 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-nvidia-6.2 | 6.2.0-1011.11 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-nvidia-6.2 | 6.2.0-1011.11 | USN-6466-1 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra | 5.15.0-1019.19 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra-igx | 5.15.0-1006.6 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-oem-5.17 | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-oem-6.0 | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-oem-6.1 | 6.1.0-1023.23 | USN-6415-1 |
| Ubuntu:22.04:LTS | linux-oem-6.1 | 6.1.0-1023.23 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-oem-6.5 | 6.5.0-1004.4 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-oracle | 5.15.0-1046.52 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-oracle | 5.15.0-1046.52 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-raspi | 5.15.0-1041.44 | USN-6446-1 |
| Ubuntu:22.04:LTS | linux-raspi | 5.15.0-1041.44 | UBUNTU-CVE-2023-4623 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-riscv-5.19 | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-starfive-5.19 | no fix listed | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-starfive-6.2 | 6.2.0-1007.8~22.04.1 | UBUNTU-CVE-2023-4623 |
| Ubuntu:22.04:LTS | linux-starfive-6.2 | 6.2.0-1007.8~22.04.1 | USN-6444-2 |
| Ubuntu:22.04:LTS | linux-xilinx-zynqmp | 5.15.0-1025.29 | UBUNTU-CVE-2023-4623 |
Affected products (as reported)
Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b3d26c5702c7d6c45456326e56d2ccf3f103e60f patch
- https://kernel.dance/b3d26c5702c7d6c45456326e56d2ccf3f103e60f
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
- http://packetstormsecurity.com/files/175963/Kernel-Live-Patch-Security-Notice-LSN-0099-1.html
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
- https://cert-portal.siemens.com/productcert/html/ssa-794697.html
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-769027.html