CVE-2024-36909: Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted
CSIRTS triage
- What
- A memory management issue in Hyper-V vmbus driver where ring buffers that fail re-encryption are freed incorrectly.
- Who is affected
- Hyper-V virtual machines using the vmbus driver when memory re-encryption operations fail.
- Urgency
- Medium urgency; CVSS 5.5 (medium severity), potential for memory corruption or denial of service in virtualized environments.
- Action
- Apply Windows or Linux kernel patches that prevent freeing of ring buffers that failed re-encryption.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch Hyper-V (Drivers: hv: vmbus)
Get an email when a new Hyper-V (Drivers: hv: vmbus) advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-36909
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-2024-369090.24% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 15% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2024-36909 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
More from Microsoft Security Response Center
- lowCVE-2026-14673: PostgreSQL amcheck does not clear untrusted search path2026-08-11
- criticalCVE-2026-69836: Microsoft Entra ID Remote Code Execution Vulnerability2026-08-11
- mediumCVE-2026-53792: rsync < 3.5.0 Out-of-Bounds Read via Zero-Length Checksum Block2026-08-11
- highCVE-2026-70347: Windows Installer Elevation of Privilege Vulnerability2026-08-11
- highCVE-2026-64909: Microsoft Office Remote Code Execution Vulnerability2026-08-11