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

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-03-27 · updated 2026-06-17
Weakness: CWE-190

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.

Affected products

Linux kernel: from 3.7 before 4.14.303; from 4.15 before 4.19.270; from 4.20 before 5.4.229; from 5.5 before 5.10.164; from 5.11 before 5.15.89; from 5.16 before 6.1.7 — fixed in 4.14.303, 4.19.270, 5.10.164, 5.15.89, 5.4.229, 6.1.7

How to fix

Upgrade to a fixed version: Linux kernel 4.14.303, 4.19.270, 5.10.164, 5.15.89. Check the vendor advisory for mitigations.

References

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