In the Linux kernel, the following vulnerability has been resolved: net/sched: qfq: Use cl_is_active to determine whether class is active in… (CVE-2026-23105)
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.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel's net/sched subsystem, specifically in the qfq scheduler, involved improper determination of class activation status by relying on the child qdisc's queue length (qlen). This could potentially be exploited by manipulating child queue lengths. The patch changes this logic to use the cl_is_active function, which is a more consistent and secure method to check if a class is active, thereby preventing possible exploits. The issue affects various Linux kernel versions prior to 5.15.0-1105.112~20.04.1 and related builds, as detailed in Ubuntu security advisories USN-8162-1 and USN-8180-1. The fix is included in updated Linux kernel packages for Ubuntu 20.04 LTS and 22.04 LTS releases, among others. Users must reboot after applying updates and recompile any third-party kernel modules due to ABI changes.
Potential Impact
If exploited, this vulnerability could allow an attacker with local privileges to manipulate the network scheduler's behavior, potentially leading to system compromise with high confidentiality, integrity, and availability impact. The CVSS 3.1 score is 7.8 (high severity), reflecting the potential for significant system compromise. However, no known exploits are currently reported in the wild.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated Linux kernel packages for affected versions. Users should apply the standard system updates and reboot their systems to ensure the vulnerability is remediated. Due to an ABI change in the kernel update, recompilation and reinstallation of any third-party kernel modules are required. Follow vendor instructions carefully to complete the update process.
In the Linux kernel, the following vulnerability has been resolved: net/sched: qfq: Use cl_is_active to determine whether class is active in… (CVE-2026-23105)
Description
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.
CVSS v3.1
Score 7.8high
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel's net/sched subsystem, specifically in the qfq scheduler, involved improper determination of class activation status by relying on the child qdisc's queue length (qlen). This could potentially be exploited by manipulating child queue lengths. The patch changes this logic to use the cl_is_active function, which is a more consistent and secure method to check if a class is active, thereby preventing possible exploits. The issue affects various Linux kernel versions prior to 5.15.0-1105.112~20.04.1 and related builds, as detailed in Ubuntu security advisories USN-8162-1 and USN-8180-1. The fix is included in updated Linux kernel packages for Ubuntu 20.04 LTS and 22.04 LTS releases, among others. Users must reboot after applying updates and recompile any third-party kernel modules due to ABI changes.
Potential Impact
If exploited, this vulnerability could allow an attacker with local privileges to manipulate the network scheduler's behavior, potentially leading to system compromise with high confidentiality, integrity, and availability impact. The CVSS 3.1 score is 7.8 (high severity), reflecting the potential for significant system compromise. However, no known exploits are currently reported in the wild.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated Linux kernel packages for affected versions. Users should apply the standard system updates and reboot their systems to ensure the vulnerability is remediated. Due to an ABI change in the kernel update, recompilation and reinstallation of any third-party kernel modules are required. Follow vendor instructions carefully to complete the update process.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23105
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
- Cvss Version
- 4.0
Threat ID: 6a5b63392d1edb114c8afb1a
Added to database: 07/18/2026, 11:27:53 UTC
Last enriched: 08/19/2026, 08:07:10 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 11
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