Linux Kernel up to 6.19.11 netfilter mtype_del privilege escalation

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.1.167/6.6.133/6.12.80/6.18.21/6.19.11. Affected by this issue is the function mtype_del of the component netfilter. The manipulation leads to an unknown weakness. This vulnerability is traded as CVE-2026-31418. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.1.167/6.6.133/6.12.80/6.18.21/6.19.11. This issue affects the function mtype_del of the component netfilter. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: drop logically empty buckets in mtype_del mtype_del() counts empty slots below n->pos in k, but it only drops the bucket when both n->pos and k are zero. This misses buckets whose live entries have all been removed while n->pos still points past deleted slots. Treat a bucket as empty when all positions below n->pos are unused and release it directly instead of shrinking it further.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-31418 since 03/09/2026. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/18/2026).

The vulnerability scanner Nessus provides a plugin with the ID 313522 (Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2026-1681)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.168, 6.6.134, 6.12.81, 6.18.22 or 6.19.12 eliminates this vulnerability. Applying the patch ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb/6cea34d7ec6829b62f521a37a287f670144a2233/b7eef00f08b92b0b9efe8ae0df6d0005e6199323/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4/ceacaa76f221a6577aba945bb8873c2e640aeba4/9862ef9ab0a116c6dca98842aab7de13a252ae02 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 (313522), EUVD (EUVD-2026-21941) and CERT Bund (WID-SEC-2026-1088). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Microsoft Azure Linux
  • Open Source Linux Kernel

Productinfo

Type

Vendor

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: 5.4

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

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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

Exploitinginfo

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

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 313522
Nessus Name: Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2026-1681)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.168/6.6.134/6.12.81/6.18.22/6.19.12
Patch: ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb/6cea34d7ec6829b62f521a37a287f670144a2233/b7eef00f08b92b0b9efe8ae0df6d0005e6199323/68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4/ceacaa76f221a6577aba945bb8873c2e640aeba4/9862ef9ab0a116c6dca98842aab7de13a252ae02

Timelineinfo

03/09/2026 CVE reserved
04/13/2026 +34 days Advisory disclosed
04/13/2026 +0 days VulDB entry created
06/18/2026 +66 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-31418 (🔒)
GCVE (CVE): GCVE-0-2026-31418
GCVE (VulDB): GCVE-100-357149
EUVD: 🔒
CERT Bund: WID-SEC-2026-1088 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 04/13/2026 16:03
Updated: 06/18/2026 14:51
Changes: 04/13/2026 16:03 (58), 04/14/2026 17:58 (7), 04/19/2026 17:45 (1), 05/10/2026 03:08 (2), 05/21/2026 00:34 (10), 06/18/2026 14:51 (1)
Complete: 🔍
Cache ID: 216::103

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