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CVE-2026-53021: scsi: target: core: Fix integer overflow in UNMAP bounds check

mediumCVSS 6.1CVE-2026-53021

CSIRTS triage

vendor: nullproduct: nullOther
What
There is a medium severity integer overflow vulnerability in the UNMAP bounds check of the SCSI target core.
Who is affected
Deployments using the SCSI target core are affected.
Urgency
Remediation is advisable due to the medium severity of the vulnerability.
Action
Update to the latest version to fix this issue.

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

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
medium — CVSS 6.1
Published
2026-06-09
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53021

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-2026-53021coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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

Recent advisories for scsi

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.

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