In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: do not free existing class in qfq_change_class() Fixes… (CVE-2026-22999)
A use-after-free vulnerability in the Linux kernel's network scheduler (sch_qfq) was fixed by correcting the error handling in qfq_change_class(). This flaw could lead to memory corruption. The issue affects multiple Linux kernel versions prior to specific patched releases. Ubuntu has released updates addressing this and other kernel vulnerabilities, requiring system updates and reboots. The fix involves updating to the patched kernel versions provided by Ubuntu.
AI Analysis
Technical Summary
CVE-2026-22999 is a vulnerability in the Linux kernel's network scheduler component (sch_qfq) where the function qfq_change_class() improperly frees existing class objects in error cases, leading to use-after-free conditions. This can cause memory corruption and potentially allow an attacker with limited privileges to compromise system integrity. The vulnerability affects various Linux kernel versions prior to the patched releases in Ubuntu 20.04 LTS and 22.04 LTS. Ubuntu has issued security advisories (USN-8162-1, USN-8180-1) detailing fixes across multiple kernel subsystems, including this issue. The updates require rebooting the system and recompiling third-party kernel modules due to ABI changes.
Potential Impact
Successful exploitation of this vulnerability could allow a local attacker with limited privileges to cause memory corruption, leading to potential system compromise including confidentiality, integrity, and availability impacts. The CVSS v3.1 score is 7.8 (High), reflecting high impact on confidentiality, integrity, and availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated Linux kernel packages for affected versions. Users should apply the official security updates promptly and reboot their systems to activate the fixes. Due to ABI changes in the kernel updates, recompilation and reinstallation of all third-party kernel modules may be necessary. Follow the vendor advisories USN-8162-1 and USN-8180-1 for detailed update instructions. No additional mitigation is required beyond applying these official fixes.
In the Linux kernel, the following vulnerability has been resolved: net/sched: sch_qfq: do not free existing class in qfq_change_class() Fixes… (CVE-2026-22999)
Description
A use-after-free vulnerability in the Linux kernel's network scheduler (sch_qfq) was fixed by correcting the error handling in qfq_change_class(). This flaw could lead to memory corruption. The issue affects multiple Linux kernel versions prior to specific patched releases. Ubuntu has released updates addressing this and other kernel vulnerabilities, requiring system updates and reboots. The fix involves updating to the patched kernel versions provided by Ubuntu.
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
CVE-2026-22999 is a vulnerability in the Linux kernel's network scheduler component (sch_qfq) where the function qfq_change_class() improperly frees existing class objects in error cases, leading to use-after-free conditions. This can cause memory corruption and potentially allow an attacker with limited privileges to compromise system integrity. The vulnerability affects various Linux kernel versions prior to the patched releases in Ubuntu 20.04 LTS and 22.04 LTS. Ubuntu has issued security advisories (USN-8162-1, USN-8180-1) detailing fixes across multiple kernel subsystems, including this issue. The updates require rebooting the system and recompiling third-party kernel modules due to ABI changes.
Potential Impact
Successful exploitation of this vulnerability could allow a local attacker with limited privileges to cause memory corruption, leading to potential system compromise including confidentiality, integrity, and availability impacts. The CVSS v3.1 score is 7.8 (High), reflecting high impact on confidentiality, integrity, and availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
A patch is available and has been released by Ubuntu in updated Linux kernel packages for affected versions. Users should apply the official security updates promptly and reboot their systems to activate the fixes. Due to ABI changes in the kernel updates, recompilation and reinstallation of all third-party kernel modules may be necessary. Follow the vendor advisories USN-8162-1 and USN-8180-1 for detailed update instructions. No additional mitigation is required beyond applying these official fixes.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-22999
- 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: 6a5b63742d1edb114c8b4a85
Added to database: 07/18/2026, 11:28:52 UTC
Last enriched: 08/22/2026, 21:47:24 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 6
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