CVE-2026-64449: staging: vme_user: bound slave read/write to the kern_buf size

highCVSS 7.8CVE-2026-64449

CSIRTS triage

Other

What: The vulnerability involves unbounded slave read/write operations in the vme_user staging driver.
Who is affected: Deployments using the vme_user driver are affected.
Urgency: Remediation is important to prevent potential out-of-bounds access.
Action: Apply the fix to bound slave read/write operations to the kern_buf size.

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

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.8
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64449

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-2026-644490.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64449	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

highCVE-2026-64449: In the Linux kernel, the following vulnerability has been resolved: staging: vme_user: bound s…nvd

Recent advisories for staging

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.

highCVE-2026-64536: In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix OO…nvd · 2026-07-27
highCVE-2026-64449: In the Linux kernel, the following vulnerability has been resolved: staging: vme_user: bound s…nvd · 2026-07-25
highCVE-2026-64447: In the Linux kernel, the following vulnerability has been resolved: staging: media: ipu7: fix …nvd · 2026-07-25
unknownCVE-2026-64446: In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix he…nvd · 2026-07-25
highCVE-2026-64445: In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix WE…nvd · 2026-07-25
highCVE-2026-64444: In the Linux kernel, the following vulnerability has been resolved: staging: rtl8723bs: fix OO…nvd · 2026-07-25