CVE-2023-42756

Kernel: netfilter: race condition between ipset_cmd_add and ipset_cmd_swap

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.

Affected

Red Hat · Red Hat Enterprise Linux 9 · Red Hat Enterprise Linux 6 · Red Hat Enterprise Linux 7 · Red Hat Enterprise Linux 8

CVSS v3.1 NVD

4.7 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 REDHAT

4.4 MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

EPSS

0.27% chance of exploitation in the next 30 days, 19th percentile

Published

2023-09-28

Updated

2025-11-06

Proof-of-concept exploits (1)

• https://seclists.org/oss-sec/2023/q3/242

Security advisories

• https://access.redhat.com/security/cve/CVE-2023-42756
• https://bugzilla.redhat.com/show_bug.cgi?id=2239848

References

• CVE Record
• NVD entry