CVE-2024-11614 Overview
An out-of-bounds read vulnerability was discovered in DPDK's Vhost library checksum offload feature. This security flaw enables an untrusted or compromised guest virtual machine to crash the hypervisor's vSwitch by forging Virtio descriptors that cause out-of-bounds reads. The vulnerability allows an attacker with access to a malicious VM using a virtio driver to cause the vhost-user side to crash by sending a packet with a Tx checksum offload request and an invalid csum_start offset.
Critical Impact
This vulnerability can be exploited from an adjacent network without authentication or user interaction, potentially causing denial of service to virtualization infrastructure and affecting multiple tenants in cloud environments.
Affected Products
- DPDK (Data Plane Development Kit) Vhost library
- Red Hat Enterprise Linux with DPDK packages
- Virtualization environments using vhost-user with checksum offload
Discovery Timeline
- 2024-12-18 - CVE-2024-11614 published to NVD
- 2025-04-17 - Last updated in NVD database
Technical Details for CVE-2024-11614
Vulnerability Analysis
This vulnerability resides in DPDK's Vhost library, specifically within the checksum offload feature used for network packet processing in virtualized environments. The Vhost library provides a user-space implementation of the virtio backend, enabling high-performance networking for virtual machines through the vhost-user protocol.
The flaw is classified as CWE-125 (Out-of-Bounds Read), where the application reads data past the end of an intended buffer. When processing Tx (transmit) packets with checksum offload requests, the library fails to properly validate the csum_start offset provided in the Virtio descriptor. A malicious guest can forge descriptors with invalid offset values, causing the vhost-user process to read memory beyond allocated boundaries.
The impact is primarily denial of service—crashing the hypervisor's vSwitch can disrupt network connectivity for all virtual machines relying on that switch, potentially affecting entire virtualization clusters in multi-tenant environments.
Root Cause
The root cause of CVE-2024-11614 is insufficient validation of the csum_start offset field in Virtio descriptors during checksum offload processing. The Vhost library trusts the offset value provided by the guest without verifying it falls within the valid bounds of the packet buffer. This missing boundary check allows a malicious guest to supply an arbitrary offset that causes the library to read beyond the allocated memory region when calculating or verifying checksums.
Attack Vector
The attack requires access from an adjacent network position, meaning the attacker needs control of a virtual machine on the same physical host or within the same network segment as the target vSwitch. The attack scenario proceeds as follows:
- An attacker gains control of a guest VM using virtio network drivers
- The attacker crafts a malicious network packet with checksum offload enabled
- The packet includes a Virtio descriptor with an invalid csum_start offset pointing outside buffer boundaries
- When the vhost-user process attempts to process the checksum offload request, it reads from the invalid memory location
- The out-of-bounds read causes the vSwitch process to crash, disrupting network connectivity
The vulnerability does not require authentication or user interaction, making it particularly dangerous in shared virtualization environments where guests from different tenants may coexist on the same physical infrastructure.
Detection Methods for CVE-2024-11614
Indicators of Compromise
- Unexpected crashes or restarts of vSwitch or DPDK-based networking processes
- Segmentation faults in vhost-user processes with stack traces pointing to checksum handling code
- Guest VMs generating unusual patterns of network packets with checksum offload requests
- Core dumps from vSwitch processes indicating memory access violations
Detection Strategies
- Monitor for DPDK process crashes using process monitoring tools and configure alerts for vhost-user process terminations
- Implement logging for virtio descriptor validation failures and unusual checksum offload patterns
- Deploy host-based intrusion detection to identify VMs sending malformed virtio descriptors
- Review system logs for SIGBUS or SIGSEGV signals originating from DPDK network processing threads
Monitoring Recommendations
- Configure centralized logging for all hypervisor and vSwitch components to correlate crash events
- Establish baseline metrics for vSwitch process stability and alert on deviation
- Monitor network I/O patterns from guest VMs for anomalous checksum offload request rates
- Implement real-time alerting for vSwitch process failures using infrastructure monitoring tools
How to Mitigate CVE-2024-11614
Immediate Actions Required
- Apply vendor security patches from Red Hat or your Linux distribution immediately
- Review and audit which guest VMs have virtio network drivers enabled
- Consider temporarily disabling checksum offload features if patches cannot be immediately applied
- Isolate critical virtualization infrastructure from untrusted guest workloads
Patch Information
Red Hat has released multiple security advisories addressing this vulnerability. Organizations should apply the appropriate patches based on their deployment:
- Red Hat Security Advisory RHSA-2025:0208
- Red Hat Security Advisory RHSA-2025:0209
- Red Hat Security Advisory RHSA-2025:0210
- Red Hat Security Advisory RHSA-2025:0211
- Red Hat Security Advisory RHSA-2025:0220
- Red Hat Security Advisory RHSA-2025:0221
- Red Hat Security Advisory RHSA-2025:0222
Additional technical details are available in the Red Hat Bugzilla Report #2327955 and the OpenWall OSS-Security Discussion.
Workarounds
- Disable Tx checksum offload in virtio network configurations for untrusted guest VMs until patches are applied
- Implement network segmentation to limit the blast radius of a potential vSwitch crash
- Configure high-availability for vSwitch components to minimize service disruption from crashes
- Use guest VM sandboxing or additional isolation layers for workloads that cannot be immediately patched
# Example: Disable checksum offload for a virtio interface (temporary workaround)
# Check current offload settings
ethtool -k eth0 | grep checksum
# Disable tx checksum offload on the guest interface
ethtool -K eth0 tx-checksum-ip-generic off
ethtool -K eth0 tx-checksum-ipv4 off
ethtool -K eth0 tx-checksum-ipv6 off
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
