CVE-2024-27020 netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()

What is CVE-2024-27020?

CVE-2024-27020 is a high-severity vulnerability in Linux kernel, published on 1 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()

nft_unregister_expr() can concurrent with __nft_expr_type_get(), and there is not any protection when iterate over nf_tables_expressions list in __nft_expr_type_get(). Therefore, there is potential data-race of nf_tables_expressions list entry.

Use list_for_each_entry_rcu() to iterate over nf_tables_expressions list in __nft_expr_type_get(), and use rcu_read_lock() in the caller nft_expr_type_get() to protect the entire type query process.

Weakness: CWE-362

Which versions are affected by CVE-2024-27020?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-27020?

Apply the vendor's patch.

Is CVE-2024-27020 being exploited?

There is no known exploitation of CVE-2024-27020 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-42192, BELL-CVE-2024-27020, DEBIAN-CVE-2024-27020, GHSA-rhrr-35q8-4p7f, UBUNTU-CVE-2024-27020.