Linux Kernel up to 6.18.23/6.19.13 netlink_ns_capable privilege escalation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.23/6.19.13. It has been declared as critical. This affects the function netlink_ns_capable. Such manipulation leads to an unknown weakness. This vulnerability is documented as CVE-2026-31692. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.23/6.19.13. It has been rated as critical. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: rtnetlink: add missing netlink_ns_capable() check for peer netns rtnl_newlink() lacks a CAP_NET_ADMIN capability check on the peer network namespace when creating paired devices (veth, vxcan, netkit). This allows an unprivileged user with a user namespace to create interfaces in arbitrary network namespaces, including init_net. Add a netlink_ns_capable() check for CAP_NET_ADMIN in the peer namespace before allowing device creation to proceed.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-31692 since 03/09/2026. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/23/2026).

The vulnerability scanner Nessus provides a plugin with the ID 322107 (Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2026-1894)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.18.24 or 6.19.14 eliminates this vulnerability. Applying the patch 0975b64ffb34560042090a5986c3a02e6c80f36f/d04cc16d3624218a5458b2b664ae431f1b3b334d/7b735ef81286007794a227ce2539419479c02a5f is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (322107), EUVD (EUVD-2026-26363) and CERT Bund (WID-SEC-2026-1326). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Open Source Linux Kernel

Productinfo

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Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Privilege escalation
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 322107
Nessus Name: Amazon Linux 2023 : bpftool6.12, kernel6.12, kernel6.12-devel (ALAS2023-2026-1894)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.24/6.19.14
Patch: 0975b64ffb34560042090a5986c3a02e6c80f36f/d04cc16d3624218a5458b2b664ae431f1b3b334d/7b735ef81286007794a227ce2539419479c02a5f

Timelineinfo

03/09/2026 CVE reserved
04/30/2026 +51 days Advisory disclosed
04/30/2026 +0 days VulDB entry created
06/23/2026 +54 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31692 (🔒)
GCVE (CVE): GCVE-0-2026-31692
GCVE (VulDB): GCVE-100-360296
EUVD: 🔒
CERT Bund: WID-SEC-2026-1326 - Linux Kernel: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen

Entryinfo

Created: 04/30/2026 13:32
Updated: 06/23/2026 13:31
Changes: 04/30/2026 13:32 (57), 04/30/2026 15:25 (1), 04/30/2026 17:13 (7), 06/23/2026 13:31 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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