CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

CVE-2026-45855: ata: libata-scsi: avoid Non-NCQ command starvation

mediumCVSS 5.5CVE-2026-45855

CSIRTS triage

product: Linux kernel (libata-scsi ATA driver)Denial of service
What
A command starvation vulnerability in the libata-scsi layer where NCQ commands can block non-NCQ commands indefinitely, causing I/O hangs.
Who is affected
Systems using SATA/SAS controllers with NCQ support under heavy mixed workloads.
Urgency
Medium; CVSS 5.5 indicates denial-of-service risk but requires specific workload conditions.
Action
Update to a patched Linux kernel version with proper NCQ/non-NCQ command scheduling fairness in libata-scsi.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Linux kernel (libata-scsi ATA driver)

Get an email when a new Linux kernel (libata-scsi ATA driver) advisory drops — max one per day, one-click unsubscribe.

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 5.5
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45855

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-45855coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for ata

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center