Kernel: netfilter: race condition between ipset_cmd_add and ipset_cmd_swap

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Summary

CVECVE-2023-42756
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-09-28 14:15:21 UTC
Updated2026-11-07 12:17:35 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

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

EPSS: 0.002740000 probability, percentile 0.198620000 (date 2026-11-08)

Problem Types: CWE-362 | CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary4.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1[email protected]Secondary4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS4.4MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 10.0 All All All
Operating System Fedoraproject Fedora 37 All All All
Operating System Fedoraproject Fedora 38 All All All
Operating System Fedoraproject Fedora 39 All All All
Operating System Linux Linux Kernel All All All All
Operating System Linux Linux Kernel 6.6 rc1 All All
Operating System Linux Linux Kernel 6.6 rc2 All All
Operating System Redhat Enterprise Linux 9.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:5.14.0-427.13.1.el9_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:5.14.0-427.13.1.el9_4 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 8 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 9 Not specified Not specified

References

ReferenceSourceLinkTags
[SECURITY] Fedora 38 Update: kernel-6.5.6-200.fc38 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
[SECURITY] [DLA 3623-1] linux-5.10 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
[SECURITY] Fedora 37 Update: kernel-6.5.6-100.fc37 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
[SECURITY] Fedora 39 Update: kernel-6.5.6-300.fc39 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
2239848 – (CVE-2023-42756) CVE-2023-42756 kernel: netfilter: race condition between IPSET_CMD_ADD and IPSET_CMD_SWAP af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Exploit, Issue Tracking, Patch, Third Party Advisory
access.redhat.com/errata/RHSA-2024:2394 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
cve-details af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Patch, Third Party Advisory
oss-sec: [CVE-2023-42756] Linux kernel race condition in netfilter af854a3a-2127-422b-91ae-364da2661108 seclists.org Exploit, Mailing List, Patch, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2023-09-20T00:00:00.000ZReported to Red Hat.
CNA2023-09-27T00:00:00.000ZMade public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Legacy QID Mappings

  • 161237 Oracle Enterprise Linux Security Update for unbreakable enterprise kernel (ELSA-2023-13043)
  • 199841 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6444-1)
  • 199844 Ubuntu Security Notification for Linux kernel (Intel IoTG) Vulnerabilities (USN-6445-1)
  • 199845 Ubuntu Security Notification for Linux kernel (BlueField) Vulnerabilities (USN-6442-1)
  • 199846 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6441-1)
  • 199847 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-6443-1)
  • 199848 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6446-1)
  • 199854 Ubuntu Security Notification for Linux kernel (GCP) Vulnerabilities (USN-6441-2)
  • 199858 Ubuntu Security Notification for Linux kernel (Intel IoTG) Vulnerabilities (USN-6445-2)
  • 199859 Ubuntu Security Notification for Linux kernel (StarFive) Vulnerabilities (USN-6444-2)
  • 199861 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6446-2)
  • 199868 Ubuntu Security Notification for Linux kernel (Oracle) Vulnerabilities (USN-6446-3)
  • 199872 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6441-3)
  • 199883 Ubuntu Security Notification for Linux kernel (NVIDIA) Vulnerabilities (USN-6466-1)
  • 199893 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-6479-1)
  • 199912 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6454-1)
  • 199913 Ubuntu Security Notification for Linux kernel (StarFive) Vulnerabilities (USN-6454-4)
  • 199916 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6454-2)
  • 199918 Ubuntu Security Notification for Linux kernel (ARM laptop) Vulnerabilities (USN-6454-3)
  • 284598 Fedora Security Update for kernel (FEDORA-2023-50bd7c9c12)
  • 284599 Fedora Security Update for kernel (FEDORA-2023-830d9ec624)
  • 285211 Fedora Security Update for kernel (FEDORA-2023-c3bb819677)
  • 356530 Amazon Linux Security Advisory for kernel : ALAS2023-2023-385
  • 356569 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.15-2023-028
  • 6000265 Debian Security Update for linux-5.10 (DLA 3623-1)
  • 6140204 AWS Bottlerocket Security Update for kernel (GHSA-3gh7-4chv-fmw4)
  • 6140380 AWS Bottlerocket Security Update for kernel (GHSA-j3v4-jxrr-6grv)
  • 673595 EulerOS Security Update for kernel (EulerOS-SA-2023-3247)
  • 673692 EulerOS Security Update for kernel (EulerOS-SA-2023-3275)
  • 907558 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (30055-1)

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