MEDIUM

CVE-2023-42756

CVSS v3

4.7

MEDIUM

EPSS Score

0.3 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

bpftoolAlmaLinux:9all versions · fixed in 7.3.0-427.13.1.el9_4
kernelAlmaLinux:9all versions · fixed in 5.14.0-427.13.1.el9_4and 60 other packages
linuxUbuntu:23.10all versions · fixed in 6.5.0-10.10
linux-awsUbuntu:23.10all versions · fixed in 6.5.0-1009.9
linux-gcpUbuntu:23.10all versions · fixed in 6.5.0-1008.8and 1 other package
linux-laptopUbuntu:23.10all versions · fixed in 6.5.0-1005.8
linux-lowlatencyUbuntu:23.10all versions · fixed in 6.5.0-10.10.1
linux-oracleUbuntu:23.10all versions · fixed in 6.5.0-1011.11

2 more package ranges on OSV.dev

Vendor advisories

CVE-2023-42756 Red Hat Product Security845 products fixed · 22 known affected
kernel: netfilter: race condition between IPSET_CMD_ADD and IPSET_CMD_SWAP
kernel-rt as a component of Red Hat Enterprise Linux 9 · kernel-rt-core as a component of Red Hat Enterprise Linux 9 · kernel-rt-debug as a component of Red Hat Enterprise Linux 9
RHSA-2024:2394 Red Hat Product Security279 products fixed
Red Hat Security Advisory: kernel security, bug fix, and enhancement update

Full record on NVD

Description

A flaw was found in the Netfilter subsystem of the Linux kernel. A race condition between IPSET_CMD_ADD and IPSET_CMD_SWAP can lead to a kernel panic due to the invocation of `__ip_set_put` on a wrong `set`. This issue may allow a local user to crash the system.

Technical details

Published: 2023-09-28

Frequently asked questions

What is CVE-2023-42756?

Is CVE-2023-42756 actively exploited?

Active exploitation of CVE-2023-42756 has not been confirmed. Its EPSS score was 0.3% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-42756?

CVE-2023-42756 has a CVSS v3 base score of 4.7 (MEDIUM severity).

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