Vulnerability · Published Jul 21, 2023 · Assigned by Google
CVE-2023-3776Use-after-free in Linux kernel's net/sched: cls_fw 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 44% 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 56.4% 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_fw component can be exploited to achieve local privilege escalation. If tcf_change_indev() fails, fw_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 0323bce598eea038714f941ce2b22541c46d488f.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | bpftool | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | bpftool | 7.0.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-core | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-debug | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-debug-core | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-debug-devel | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-debug-devel-matched | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-debug-modules | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-debug-modules-core | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-debug-modules-extra | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-devel | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-devel-matched | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-modules | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-modules-core | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-64k-modules-extra | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-abi-stablelists | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-abi-stablelists | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-core | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-core | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-cross-headers | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:8 | kernel-debug | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-debug | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-debug-core | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-debug-core | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-debug-devel | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-debug-devel | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-debug-devel-matched | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-debug-modules | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-debug-modules | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-debug-modules-core | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-debug-modules-extra | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-debug-modules-extra | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-debug-uki-virt | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-devel | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-devel | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-devel-matched | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-doc | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:8 | kernel-headers | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:8 | kernel-modules | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-modules | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-modules-core | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-modules-extra | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-modules-extra | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-rt | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-core | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-debug | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-debug-core | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-debug-devel | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-debug-kvm | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-debug-modules | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-debug-modules-core | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-debug-modules-extra | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-devel | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-kvm | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-modules | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-modules-core | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:9 | kernel-rt-modules-extra | 5.14.0-284.30.1.rt14.315.el9_2 | ALSA-2023:5091 |
| AlmaLinux:8 | kernel-tools | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-tools | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-tools-libs | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-tools-libs | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-tools-libs-devel | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-tools-libs-devel | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-uki-virt | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-zfcpdump | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-zfcpdump | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-zfcpdump-core | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-zfcpdump-core | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-zfcpdump-devel | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-zfcpdump-devel | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-zfcpdump-devel-matched | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-zfcpdump-modules | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-zfcpdump-modules | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | kernel-zfcpdump-modules-core | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | kernel-zfcpdump-modules-extra | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | kernel-zfcpdump-modules-extra | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | perf | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | perf | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:8 | python3-perf | 4.18.0-477.27.2.el8_8 | ALSA-2023:5244 |
| AlmaLinux:9 | python3-perf | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| AlmaLinux:9 | rtla | 5.14.0-284.30.1.el9_2 | ALSA-2023:5069 |
| Debian:12 | linux | 6.1.52-1 | DEBIAN-CVE-2023-3776 |
| Debian:12 | linux | 6.1.52-1 | DSA-5492-1 |
| Debian:13 | linux | 6.4.4-2 | DEBIAN-CVE-2023-3776 |
| Debian:14 | linux | 6.4.4-2 | DEBIAN-CVE-2023-3776 |
| Rocky Linux:8 | kernel | 0:4.18.0-477.27.1.el8_8.cloud | RXSA-2023:5244 |
| Rocky Linux:8 | kernel | 0:4.18.0-477.27.1.el8_8 | RLSA-2023:5244 |
| Rocky Linux:9 | kernel-rt | 0:5.14.0-284.30.1.rt14.315.el9_2 | RLSA-2023:5091 |
| Ubuntu:22.04:LTS | linux | 5.15.0-82.91 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux | 5.15.0-82.91 | USN-6315-1 |
| Ubuntu:22.04:LTS | linux-allwinner-5.19 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-aws | 5.15.0-1043.48 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-aws | 5.15.0-1043.48 | USN-6315-1 |
| Ubuntu:22.04:LTS | linux-aws-5.19 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-aws-6.2 | 6.2.0-1010.10~22.04.1 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-aws-6.2 | 6.2.0-1010.10~22.04.1 | USN-6318-1 |
| Ubuntu:22.04:LTS | linux-azure | 5.15.0-1045.52 | USN-6332-1 |
| Ubuntu:22.04:LTS | linux-azure | 5.15.0-1045.52 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-azure-5.19 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-azure-6.2 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-azure-fde | 5.15.0-1045.52.1 | USN-6332-1 |
| Ubuntu:22.04:LTS | linux-azure-fde | 5.15.0-1045.52.1 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-azure-fde-5.19 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-azure-fde-6.2 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-gcp | 5.15.0-1040.48 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-gcp | 5.15.0-1040.48 | USN-6315-1 |
| Ubuntu:22.04:LTS | linux-gcp-5.19 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-gcp-6.2 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-gke | 5.15.0-1040.45 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-gke | 5.15.0-1040.45 | USN-6315-1 |
| Ubuntu:22.04:LTS | linux-gkeop | 5.15.0-1026.31 | USN-6315-1 |
| Ubuntu:22.04:LTS | linux-gkeop | 5.15.0-1026.31 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-hwe-5.19 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-hwe-6.2 | 6.2.0-31.31~22.04.1 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-hwe-6.2 | 6.2.0-31.31~22.04.1 | USN-6318-1 |
| Ubuntu:22.04:LTS | linux-ibm | 5.15.0-1036.39 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-ibm | 5.15.0-1036.39 | USN-6315-1 |
| Ubuntu:22.04:LTS | linux-intel-iotg | 5.15.0-1038.43 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-intel-iotg | 5.15.0-1038.43 | USN-6325-1 |
| Ubuntu:22.04:LTS | linux-kvm | 5.15.0-1040.45 | USN-6315-1 |
| Ubuntu:22.04:LTS | linux-kvm | 5.15.0-1040.45 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-lowlatency | 5.15.0-82.91 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-lowlatency | 5.15.0-82.91 | USN-6315-1 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-5.19 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.2 | 6.2.0-1011.11~22.04.1 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-lowlatency-hwe-6.2 | 6.2.0-1011.11~22.04.1 | USN-6318-1 |
| Ubuntu:22.04:LTS | linux-nvidia | 5.15.0-1031.31 | USN-6315-1 |
| Ubuntu:22.04:LTS | linux-nvidia | 5.15.0-1031.31 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-nvidia-6.2 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra | 5.15.0-1017.17 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-nvidia-tegra-igx | 5.15.0-1004.4 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-oem-5.17 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-oem-6.0 | 6.0.0-1021.21 | USN-6385-1 |
| Ubuntu:22.04:LTS | linux-oem-6.0 | 6.0.0-1021.21 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-oem-6.1 | 6.1.0-1019.19 | USN-6285-1 |
| Ubuntu:22.04:LTS | linux-oem-6.1 | 6.1.0-1019.19 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-oracle | 5.15.0-1041.47 | USN-6315-1 |
| Ubuntu:22.04:LTS | linux-oracle | 5.15.0-1041.47 | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-raspi | 5.15.0-1036.39 | USN-6348-1 |
| Ubuntu:22.04:LTS | linux-raspi | 5.15.0-1036.39 | UBUNTU-CVE-2023-3776 |
| Ubuntu:24.04:LTS | linux-raspi-realtime | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-realtime | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-riscv | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-riscv-5.19 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-starfive-5.19 | no fix listed | UBUNTU-CVE-2023-3776 |
| Ubuntu:22.04:LTS | linux-xilinx-zynqmp | 5.15.0-1025.29 | UBUNTU-CVE-2023-3776 |
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=0323bce598eea038714f941ce2b22541c46d488f patch
- https://kernel.dance/0323bce598eea038714f941ce2b22541c46d488f
- https://www.debian.org/security/2023/dsa-5480
- https://www.debian.org/security/2023/dsa-5492
- http://packetstormsecurity.com/files/175072/Kernel-Live-Patch-Security-Notice-LSN-0098-1.html
- 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://security.netapp.com/advisory/ntap-20240202-0003/