In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in… (CVE-2026-22976)
A vulnerability in the Linux kernel's net/sched subsystem (sch_qfq) could cause a NULL pointer dereference when deactivating an inactive aggregate. This occurs due to improper handling of shared leaf_qdisc objects between multiple qfq_class instances, leading to a kernel crash. The issue has been resolved in updated Linux kernel versions.
AI Analysis
Technical Summary
CVE-2026-22976 describes a NULL pointer dereference vulnerability in the Linux kernel's sch_qfq scheduler. The flaw arises because the condition `qfq_class->leaf_qdisc->q.qlen > 0` does not guarantee that the class itself is active, as two qfq_class objects may share the same leaf_qdisc. When one QFQ qdisc is attached as the root and another is temporarily referenced and pending destruction, the qfq_reset function may wrongly deactivate an inactive aggregate, triggering a NULL dereference in qfq_deactivate_agg. This results in a kernel crash (BUG: kernel NULL pointer dereference). The vulnerability affects multiple Linux kernel versions prior to specific patched releases.
Potential Impact
The vulnerability causes a denial of service via a kernel crash due to a NULL pointer dereference. There is no indication of confidentiality or integrity impact. The CVSS score is 5.5 (medium severity), reflecting local attack vector with low complexity and no user interaction required, but limited to denial of service impact.
Mitigation Recommendations
A fix is available and has been released in updated Linux kernel packages. Users should apply the official kernel updates provided by their distribution, such as the Ubuntu security notices USN-8096-1 and USN-8096-2, and reboot the system to apply changes. Due to ABI changes, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigations are required beyond applying the official patches.
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: Fix NULL deref when deactivating inactive aggregate in… (CVE-2026-22976)
Description
A vulnerability in the Linux kernel's net/sched subsystem (sch_qfq) could cause a NULL pointer dereference when deactivating an inactive aggregate. This occurs due to improper handling of shared leaf_qdisc objects between multiple qfq_class instances, leading to a kernel crash. The issue has been resolved in updated Linux kernel versions.
CVSS v3.1
Score 5.5medium
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
CVE-2026-22976 describes a NULL pointer dereference vulnerability in the Linux kernel's sch_qfq scheduler. The flaw arises because the condition `qfq_class->leaf_qdisc->q.qlen > 0` does not guarantee that the class itself is active, as two qfq_class objects may share the same leaf_qdisc. When one QFQ qdisc is attached as the root and another is temporarily referenced and pending destruction, the qfq_reset function may wrongly deactivate an inactive aggregate, triggering a NULL dereference in qfq_deactivate_agg. This results in a kernel crash (BUG: kernel NULL pointer dereference). The vulnerability affects multiple Linux kernel versions prior to specific patched releases.
Potential Impact
The vulnerability causes a denial of service via a kernel crash due to a NULL pointer dereference. There is no indication of confidentiality or integrity impact. The CVSS score is 5.5 (medium severity), reflecting local attack vector with low complexity and no user interaction required, but limited to denial of service impact.
Mitigation Recommendations
A fix is available and has been released in updated Linux kernel packages. Users should apply the official kernel updates provided by their distribution, such as the Ubuntu security notices USN-8096-1 and USN-8096-2, and reboot the system to apply changes. Due to ABI changes, recompilation and reinstallation of third-party kernel modules may be necessary. No additional mitigations are required beyond applying the official patches.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-22976
- 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
- 3.1
Threat ID: 6a5b637c2d1edb114c8b546a
Added to database: 07/18/2026, 11:29:00 UTC
Last enriched: 08/22/2026, 21:52:40 UTC
Last updated: 09/10/2026, 19:24:58 UTC
Views: 7
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