CVE-2023-6111 Use-after-free in Linux kernel's netfilter: nf_tables component

What is CVE-2023-6111?

CVE-2023-6111 is a high-severity use after free vulnerability in Linux kernel, published on 14 Nov 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A use-after-free vulnerability in the Linux kernel's netfilter: nf_tables component can be exploited to achieve local privilege escalation.

The function nft_trans_gc_catchall did not remove the catchall set element from the catchall_list when the argument sync is true, making it possible to free a catchall set element many times.

We recommend upgrading past commit 93995bf4af2c5a99e2a87f0cd5ce547d31eb7630.

Weakness: CWE-416

Which versions are affected by CVE-2023-6111?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-6111?

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-2023-6111 being exploited?

There is no known exploitation of CVE-2023-6111 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-32122, AZL-34865, BELL-CVE-2023-6111, DEBIAN-CVE-2023-6111, GHSA-xgr2-4f4q-m3p9, UBUNTU-CVE-2023-6111 and 1 more.