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A vulnerability in the Linux kernel's Serial ATA (SATA) subsystem could cause starvation of non-NCQ commands when multiple submission queues are used under heavy NCQ load, leading to long delays or complete starvation of non-NCQ commands. This issue affects various Linux kernel versions and has been addressed in updated kernel releases. The vulnerability has a medium severity with a CVSS score of 5.5 and does not impact confidentiality or integrity but affects availability. A patch is available and should be applied to affected systems.

The vulnerability (CVE-2026-45855) in the Linux kernel's ata: libata-scsi subsystem arises when non-NCQ commands are deferred repeatedly due to constant NCQ command load on devices with multiple submission queues. The kernel function ata_scsi_qc_issue() defers non-NCQ commands as required by ACS specifications, but under heavy NCQ load from different CPUs, non-NCQ commands may be starved indefinitely. This leads to significant delays or starvation of non-NCQ commands, impacting system availability. The issue affects numerous Linux kernel versions, particularly those prior to 6.8.0-136.136 and various specific versions listed. The vulnerability has been fixed in updated kernel releases.

Detailed information about UBUNTU-CVE-2026-45855 affecting null linux-hwe-edge. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-45855 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: ata: libata-scsi: avoid Non-NCQ command starvation When a non-NCQ command is… (CVE-2026-45855)

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