CVE-2026-63810: block: Avoid mounting the bdev pseudo-filesystem in userspace

highCVSS 7.1CVE-2026-63810

CSIRTS triage

vendor: Linux product: blockOther

What: The block subsystem should avoid mounting the bdev pseudo-filesystem in userspace.
Who is affected: Deployments of the Linux kernel with block device support.
Urgency: Remediation is necessary to prevent potential security issues.
Action: Update to the latest kernel version.

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

⚡ Watch block

Get an email when a new block advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.1
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-63810

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-2026-638100.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-63810	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for block

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.

mediumCVE-2026-18435: The Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin for WordPress is vulnera…nvd · 2026-08-01
mediumCVE-2026-18062: The Kadence Blocks — Page Builder Toolkit for Gutenberg Editor plugin for WordPress is vulnera…nvd · 2026-08-01
mediumCVE-2026-15950: The Cozy Blocks – Page Builder for Gutenberg Editor & FSE with 600+ Patterns, 58 Blocks & Temp…nvd · 2026-08-01
unknownCVE-2026-10827: The Spectra Legacy WordPress plugin before 2.20.0 does not validate or escape several block st…nvd · 2026-08-01
highCVE-2026-61536: Banks generates meaningful LLM prompts using a simple template language. In versions prior to …nvd · 2026-07-30
highGHSA-xvg2-cgv6-6h7v: netfoil: Incorrect block responses could lead to localhost trafficghsa · 2026-07-29