CVE-2023-32233 Use after free in n/a
Unprivileged local users can gain root privileges via a use-after-free in the Linux kernel's Netfilter nf_tables component.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-32233?
CVE-2023-32233 is a high-severity use after free vulnerability in Linux kernel, published on 8 May 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel through 6.3.1, a use-after-free in Netfilter nf_tables when processing batch requests can be abused to perform arbitrary read and write operations on kernel memory. Unprivileged local users can obtain root privileges. This occurs because anonymous sets are mishandled.
Weakness: CWE-416
Which versions are affected by CVE-2023-32233?
It affects 3 products.
Linux distribution packages (40)
bpftool AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-abi-stablelists AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-core AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-cross-headers AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-debug AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-debug-core AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-debug-devel AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-debug-modules AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-debug-modules-extra AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-devel AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-doc AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-modules AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-modules-extra AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-rt AlmaLinux:8 | All versions | 4.18.0-477.13.1.rt7.276.el8_8 |
kernel-rt-core AlmaLinux:8 | All versions | 4.18.0-477.13.1.rt7.276.el8_8 |
kernel-rt-debug AlmaLinux:8 | All versions | 4.18.0-477.13.1.rt7.276.el8_8 |
kernel-rt-debug-core AlmaLinux:8 | All versions | 4.18.0-477.13.1.rt7.276.el8_8 |
kernel-rt-debug-devel AlmaLinux:8 | All versions | 4.18.0-477.13.1.rt7.276.el8_8 |
kernel-rt-debug-kvm AlmaLinux:8 | All versions | 4.18.0-477.13.1.rt7.276.el8_8 |
kernel-rt-debug-modules AlmaLinux:8 | All versions | 4.18.0-477.13.1.rt7.276.el8_8 |
kernel-rt-debug-modules-extra AlmaLinux:8 | All versions | 4.18.0-477.13.1.rt7.276.el8_8 |
kernel-rt-devel AlmaLinux:8 | All versions | 4.18.0-477.13.1.rt7.276.el8_8 |
kernel-rt-kvm AlmaLinux:8 | All versions | 4.18.0-477.13.1.rt7.276.el8_8 |
kernel-rt-modules AlmaLinux:8 | All versions | 4.18.0-477.13.1.rt7.276.el8_8 |
kernel-rt-modules-extra AlmaLinux:8 | All versions | 4.18.0-477.13.1.rt7.276.el8_8 |
kernel-tools AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-tools-libs AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-tools-libs-devel AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-zfcpdump AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-zfcpdump-core AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-zfcpdump-devel AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-zfcpdump-modules AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kernel-zfcpdump-modules-extra AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
perf AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
python3-perf AlmaLinux:8 | All versions | 4.18.0-477.13.1.el8_8 |
kpatch-patch-4_18_0-477_10_1 Red Hat:enterprise_linux:8::baseos | All versions | 0:1-1.el8_8 |
kpatch-patch-4_18_0-477_10_1-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 0:1-1.el8_8 |
kpatch-patch-4_18_0-477_10_1-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 0:1-1.el8_8 |
kernel-rt Red Hat:enterprise_linux:8::nfv | All versions | 0:4.18.0-477.13.1.rt7.276.el8_8 |
Products include Linux kernel, Netapp Hci Baseboard Management Controller, Redhat Enterprise Linux.
How do I fix CVE-2023-32233?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2023-32233 being exploited?
There is no known exploitation of CVE-2023-32233 in the wild and no public exploit code.
Public exploit code: 7 proofs of concept on GitHub.
Other vulnerabilities in Linux kernel
Sources
Also known as ALPINE-CVE-2023-32233, ALSA-2023:3349, ALSA-2023:3350, AZL-26690, DEBIAN-CVE-2023-32233, GHSA-4qxv-phx5-f6fx and 4 more.