CVE-2026-64326: block: skip sync_blockdev() on surprise removal in bdev_mark_dead()

mediumCVSS 5.5CVE-2026-64326

CSIRTS triage

Other

What: The sync_blockdev() function is skipped on surprise removal.
Who is affected: Deployments using block devices.
Urgency: Remediation is important to avoid potential data loss, with no known exploits.
Action: Apply the patch when it is available.

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

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 5.5
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64326

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.

Low exploitation riskCVE-2026-643260.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64326	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

unknownCVE-2026-64326: In the Linux kernel, the following vulnerability has been resolved: block: skip sync_blockdev(…nvd

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