CVE-2023-53179: netfilter: ipset: add the missing IP_SET_HASH_WITH_NET0 macro for ip_set_hash_netportnet.c

Severity: high (CVSS 7.8 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: 2025-09-15 · updated 2026-10-15
Weakness: CWE-787

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: add the missing IP_SET_HASH_WITH_NET0 macro for ip_set_hash_netportnet.c The missing IP_SET_HASH_WITH_NET0 macro in ip_set_hash_netportnet can lead to the use of wrong `CIDR_POS(c)` for calculating array offsets, which can lead to integer underflow. As a result, it leads to slab out-of-bound access. This patch adds back the IP_SET_HASH_WITH_NET0 macro to ip_set_hash_netportnet to address the issue.

Affected products

Linux kernel: from 4.4.165 before 4.5; from 4.9.141 before 4.10; from 4.14.84 before 4.14.326; from 4.19.5 before 4.19.295; from 4.20.1 before 5.4.257; from 5.5 before 5.10.195 — fixed in 4.10, 4.14.326, 4.19.295, 4.5, 5.10.195, 5.15.132

How to fix

Upgrade to a fixed version: Linux kernel 4.10, 4.14.326, 4.19.295, 4.5. Check the vendor advisory for mitigations.

References

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