Linux Kernel up to 6.6.121/6.12.67/6.18.7/6.19-rc6 sched privilege escalation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.121/6.12.67/6.18.7/6.19-rc6 and classified as critical. The affected element is an unknown function of the component sched. Such manipulation leads to an unknown weakness. This vulnerability is documented as CVE-2026-23105. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.6.121/6.12.67/6.18.7/6.19-rc6. Affected by this issue is an unknown code of the component sched. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: net/sched: qfq: Use cl_is_active to determine whether class is active in qfq_rm_from_ag This is more of a preventive patch to make the code more consistent and to prevent possible exploits that employ child qlen manipulations on qfq. use cl_is_active instead of relying on the child qdisc's qlen to determine class activation.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-23105 since 01/13/2026. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 05/03/2026).

The vulnerability scanner Nessus provides a plugin with the ID 297878 (Linux Distros Unpatched Vulnerability : CVE-2026-23105), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.122, 6.12.68, 6.18.8 or 6.19-rc7 eliminates this vulnerability. Applying the patch 93b8635974fb050c43d07e35e5edfe6e685ca28a/abd9fc26ea577561a5ef6241a1b058755ffdad0c/77f1afd0bb4d5da95236f6114e6d0dfcde187ff6/d837fbee92453fbb829f950c8e7cf76207d73f33 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 (297878) and CERT Bund (WID-SEC-2026-0324). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • RESF Rocky 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: 297878
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23105

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.6.122/6.12.68/6.18.8/6.19-rc7
Patch: 93b8635974fb050c43d07e35e5edfe6e685ca28a/abd9fc26ea577561a5ef6241a1b058755ffdad0c/77f1afd0bb4d5da95236f6114e6d0dfcde187ff6/d837fbee92453fbb829f950c8e7cf76207d73f33

Timelineinfo

01/13/2026 CVE reserved
02/04/2026 +22 days Advisory disclosed
02/04/2026 +0 days VulDB entry created
05/03/2026 +88 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23105 (🔒)
GCVE (CVE): GCVE-0-2026-23105
GCVE (VulDB): GCVE-100-344306
CERT Bund: WID-SEC-2026-0324 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 02/04/2026 18:08
Updated: 05/03/2026 19:44
Changes: 02/04/2026 18:08 (57), 02/08/2026 07:39 (2), 03/19/2026 20:39 (11), 05/03/2026 19:44 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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