CVE-2023-53032 netfilter: ipset: Fix overflow before widen in the bitmap_ip_create() function.

What is CVE-2023-53032?

CVE-2023-53032 is a medium-severity vulnerability in Linux kernel, published on 27 Mar 2025. 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: ipset: Fix overflow before widen in the bitmap_ip_create() function.

When first_ip is 0, last_ip is 0xFFFFFFFF, and netmask is 31, the value of an arithmetic expression 2 << (netmask - mask_bits - 1) is subject to overflow due to a failure casting operands to a larger data type before performing the arithmetic.

Note that it's harmless since the value will be checked at the next step.

Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with SVACE.

Weakness: CWE-190

Which versions are affected by CVE-2023-53032?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-53032?

Apply the vendor's patch.

Is CVE-2023-53032 being exploited?

There is no known exploitation of CVE-2023-53032 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 BELL-CVE-2023-53032, DEBIAN-CVE-2023-53032, GHSA-g5qc-p7w9-v26c, UBUNTU-CVE-2023-53032.