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How the CVE Works
CVE-2025-48002 exploits an integer overflow vulnerability in Windows Hyper-V’s virtual network switch. When processing large network packets, improper bounds checking allows an attacker to trigger a wraparound in memory allocation calculations. This leads to buffer underflows, exposing adjacent kernel memory contents to a malicious VM or host on the same physical network. The flaw resides in hvix64.exe’s packet segmentation logic, where a 32-bit integer overflow during packet size validation bypasses isolation safeguards. Attackers craft jumbo frames with manipulated TCP/IP options to leak privileged data across VM boundaries.
DailyCVE Form
Platform: Windows Hyper-V
Version: Windows Server 2022, 2019
Vulnerability: Information Disclosure
Severity: Critical
Date: 07/15/2025
Prediction: Patch by 08/05/2025
What Undercode Say
Get-VMNetworkAdapter -All | Where-Object {$_.SwitchName -eq "External"}
if (packet_size > MAX_ALLOC - header_len) {
// Integer overflow bypass
memcpy(leaked_data, untrusted_payload, overflow_len);
}
How Exploit
- Craft oversized network packets with TCP options
- Trigger integer wraparound during VLAN tagging
- Read leaked kernel memory via DMA
Protection from this CVE
- Disable jumbo frames
- Segment HV networks
- Apply MSRC patch
Impact
- VM escape
- Host memory exposure
- Credential theft
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
