Linux aws: In the Linux kernel, the following vulnerability has been resolved: KVM: Don't clobber irqfd routing type when deassigning irqfd When deassigning a… (CVE-2026-23198)
A vulnerability in the Linux kernel's KVM subsystem was resolved that involved improper handling of irqfd routing entries when deassigning irqfds. This flaw could break certain architecture-specific IRQ routing functions on x86 and arm64, potentially leading to system compromise. The issue was fixed by ensuring the irqfd's routing entry is not clobbered during deassignment and verifying irqfd activity before consuming routing information. This vulnerability affects linux-aws kernel versions prior to specified patched releases. A patch is available and should be applied to mitigate the risk.
AI Analysis
Technical Summary
CVE-2026-23198 addresses a vulnerability in the Linux kernel's KVM subsystem where deassigning a KVM_IRQFD improperly clobbers the irqfd's copy of the IRQ's routing entry. This behavior breaks architecture-specific functions such as kvm_arch_irq_bypass_del_producer() on x86 and arm64, which rely on the routing entry type KVM_IRQ_ROUTING_MSI. The fix involves verifying that the irqfd is still active before consuming routing information, preventing erroneous clobbering and ensuring correct routing updates. This vulnerability was resolved in linux-aws kernel versions starting from 5.15.0-1111.118~20.04.1 and later patched versions. The issue is part of a broader set of Linux kernel security fixes addressing multiple subsystems.
Potential Impact
The vulnerability could lead to incorrect handling of IRQ routing in the KVM subsystem on affected Linux kernels, potentially causing system instability or allowing an attacker with local privileges to compromise the system's integrity. The CVSS score of 7.8 indicates high impact on confidentiality, integrity, and availability, though exploitation requires local privileges and low complexity. No known exploits are reported in the wild.
Mitigation Recommendations
A patch is available and included in linux-aws kernel versions 5.15.0-1111.118~20.04.1, 5.15.0-1116.125~20.04.1, 5.15.0-1111.121~20.04.1, and 5.15.0-185.195~20.04.1 or later. Users should update their Linux kernel packages to these or newer versions and reboot to apply the fixes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor instructions for updating and rebuilding kernel modules. No alternative mitigations are specified.
Linux aws: In the Linux kernel, the following vulnerability has been resolved: KVM: Don't clobber irqfd routing type when deassigning irqfd When deassigning a… (CVE-2026-23198)
Description
A vulnerability in the Linux kernel's KVM subsystem was resolved that involved improper handling of irqfd routing entries when deassigning irqfds. This flaw could break certain architecture-specific IRQ routing functions on x86 and arm64, potentially leading to system compromise. The issue was fixed by ensuring the irqfd's routing entry is not clobbered during deassignment and verifying irqfd activity before consuming routing information. This vulnerability affects linux-aws kernel versions prior to specified patched releases. A patch is available and should be applied to mitigate the risk.
CVSS v3.1
Score 7.8high
Affected software
pkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]~14.04.1?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email protected]~16.04.1?arch=source&distro=esm-infra-legacy/xenialpkg:deb/ubuntu/[email 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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-2026-23198 addresses a vulnerability in the Linux kernel's KVM subsystem where deassigning a KVM_IRQFD improperly clobbers the irqfd's copy of the IRQ's routing entry. This behavior breaks architecture-specific functions such as kvm_arch_irq_bypass_del_producer() on x86 and arm64, which rely on the routing entry type KVM_IRQ_ROUTING_MSI. The fix involves verifying that the irqfd is still active before consuming routing information, preventing erroneous clobbering and ensuring correct routing updates. This vulnerability was resolved in linux-aws kernel versions starting from 5.15.0-1111.118~20.04.1 and later patched versions. The issue is part of a broader set of Linux kernel security fixes addressing multiple subsystems.
Potential Impact
The vulnerability could lead to incorrect handling of IRQ routing in the KVM subsystem on affected Linux kernels, potentially causing system instability or allowing an attacker with local privileges to compromise the system's integrity. The CVSS score of 7.8 indicates high impact on confidentiality, integrity, and availability, though exploitation requires local privileges and low complexity. No known exploits are reported in the wild.
Mitigation Recommendations
A patch is available and included in linux-aws kernel versions 5.15.0-1111.118~20.04.1, 5.15.0-1116.125~20.04.1, 5.15.0-1111.121~20.04.1, and 5.15.0-185.195~20.04.1 or later. Users should update their Linux kernel packages to these or newer versions and reboot to apply the fixes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor instructions for updating and rebuilding kernel modules. No alternative mitigations are specified.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23198
- 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: 6a58b4e368715ace43daf3ba
Added to database: 07/16/2026, 10:39:31 UTC
Last enriched: 08/01/2026, 07:13:31 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 8
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