Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: irqchip/sifive-plic: Fix frozen interrupt due to affinity setting PLIC ignores… (CVE-2026-23287)
A vulnerability in the Linux kernel's irqchip/sifive-plic component caused frozen interrupts due to the PLIC ignoring interrupt completion messages for disabled interrupts. This was because the PLIC does not verify if the completion ID matches the last claim ID for the target, silently ignoring completion messages for interrupts that are disabled but still being handled. The issue was fixed by enabling the interrupt before sending the completion message if it was disabled. This vulnerability affects multiple Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and related builds. A patch is available and included in recent Linux kernel updates.
AI Analysis
Technical Summary
The Linux kernel vulnerability CVE-2026-23287 involves the irqchip/sifive-plic subsystem where the PLIC (Platform-Level Interrupt Controller) ignores interrupt completion messages for interrupts that are disabled but still being handled. The PLIC signals completion by writing the interrupt ID to a claim/complete register but does not check if this ID matches the last claimed interrupt for the target. If the interrupt is disabled during handling, the completion message is silently ignored, causing the interrupt to freeze. The fix involves checking if the interrupt is disabled and enabling it before sending the completion message, ensuring proper interrupt completion. This issue affects Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and related versions. The vulnerability has a CVSS 3.1 score of 5.5 (medium severity) with local attack vector, low attack complexity, requiring low privileges, no user interaction, unchanged scope, no confidentiality or integrity impact, but high availability impact. A patch is available and included in official Linux kernel updates distributed by Ubuntu.
Potential Impact
This vulnerability can cause interrupts to freeze due to the PLIC ignoring completion messages for disabled interrupts, resulting in a denial of service condition affecting system availability. There is no impact on confidentiality or integrity. The CVSS score of 5.5 reflects a medium severity primarily due to the high impact on availability. No known exploits are reported in the wild.
Mitigation Recommendations
A patch is available and has been released by the vendor. Users should update their Linux kernel to versions 6.8.0-1061.64~22.04.1 or later as provided by their distribution's official updates. After updating, a system reboot is required to apply the fix. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Follow the vendor's update instructions carefully to ensure full remediation.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: irqchip/sifive-plic: Fix frozen interrupt due to affinity setting PLIC ignores… (CVE-2026-23287)
Description
A vulnerability in the Linux kernel's irqchip/sifive-plic component caused frozen interrupts due to the PLIC ignoring interrupt completion messages for disabled interrupts. This was because the PLIC does not verify if the completion ID matches the last claim ID for the target, silently ignoring completion messages for interrupts that are disabled but still being handled. The issue was fixed by enabling the interrupt before sending the completion message if it was disabled. This vulnerability affects multiple Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and related builds. A patch is available and included in recent Linux kernel updates.
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=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel vulnerability CVE-2026-23287 involves the irqchip/sifive-plic subsystem where the PLIC (Platform-Level Interrupt Controller) ignores interrupt completion messages for interrupts that are disabled but still being handled. The PLIC signals completion by writing the interrupt ID to a claim/complete register but does not check if this ID matches the last claimed interrupt for the target. If the interrupt is disabled during handling, the completion message is silently ignored, causing the interrupt to freeze. The fix involves checking if the interrupt is disabled and enabling it before sending the completion message, ensuring proper interrupt completion. This issue affects Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and related versions. The vulnerability has a CVSS 3.1 score of 5.5 (medium severity) with local attack vector, low attack complexity, requiring low privileges, no user interaction, unchanged scope, no confidentiality or integrity impact, but high availability impact. A patch is available and included in official Linux kernel updates distributed by Ubuntu.
Potential Impact
This vulnerability can cause interrupts to freeze due to the PLIC ignoring completion messages for disabled interrupts, resulting in a denial of service condition affecting system availability. There is no impact on confidentiality or integrity. The CVSS score of 5.5 reflects a medium severity primarily due to the high impact on availability. No known exploits are reported in the wild.
Mitigation Recommendations
A patch is available and has been released by the vendor. Users should update their Linux kernel to versions 6.8.0-1061.64~22.04.1 or later as provided by their distribution's official updates. After updating, a system reboot is required to apply the fix. Due to an ABI change, third-party kernel modules must be recompiled and reinstalled. Follow the vendor's update instructions carefully to ensure full remediation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23287
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro: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: 6a5b62d02d1edb114c8a00ff
Added to database: 07/18/2026, 11:26:08 UTC
Last enriched: 08/01/2026, 23:28:34 UTC
Last updated: 09/11/2026, 07:31:52 UTC
Views: 17
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