SARA / Free Tools / CVE / CVE-2023-42756

CVE-2023-42756 — A flaw was found in the Netfilter subsystem of the Linux kernel

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.

CVSS
4.4 MEDIUM
EPSS
1.00% (top 50.00%)
CWE
CWE-362
Published
2023-09-28T13:55:37.430Z
Last modified
2025-11-06T19:47:59.667Z
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

01What is this vulnerability?

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.

02Affected products

VendorProductVersions
Red HatRed Hat Enterprise Linux 90:5.14.0-427.13.1.el9_4
Red HatRed Hat Enterprise Linux 90:5.14.0-427.13.1.el9_4
Red HatRed Hat Enterprise Linux 6unspecified
Red HatRed Hat Enterprise Linux 7unspecified
Red HatRed Hat Enterprise Linux 7unspecified
Red HatRed Hat Enterprise Linux 8unspecified
Red HatRed Hat Enterprise Linux 8unspecified
Red HatRed Hat Enterprise Linux 9unspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

Want this in your SOAR or SIEM?
SARA's API returns EPSS, CVSS, KEV, and an analyst-grade summary in one call.
Read the API reference →