CVE-2026-97994
UnknownSummary
In the Linux kernel, the vhost/vdpa module has a bug where a queue size VRING_NUM larger than the device maximum is accepted. vhost_vring_set_num() accepts any non-zero power-of-two queue size fitting in 16 bits, and vhost-vdpa passes that value to set_vq_num() without comparing it with get_vq_num_max(). A process with access to /dev/vhost-vdpa-* can configure a queue larger than the device advertises, leading to an out-of-bounds read in the vringh IOTLB path (KASAN reports a 16-byte out-of-bounds read).
Risk Assessment
A local user with access to /dev/vhost-vdpa-* can trigger an out-of-bounds read, leading to a kernel crash or potential data exposure. Affects systems using vhost-vdpa and vdpa_sim.
Recommendation
Update the Linux kernel to a version containing the fix that validates the queue size against get_vq_num_max() and caches that value after reset. Restrict access to /dev/vhost-vdpa-* for untrusted users.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: vhost/vdpa: reject VRING_NUM larger than device max vhost_vring_set_num() accepts any non-zero power-of-two queue size that fits in 16 bits. vhost-vdpa then passes that value to set_vq_num() without comparing it with get_vq_num_max(). A process with access to /dev/vhost-vdpa-* can therefore configure a queue larger than the device advertises. With vdpa_sim, the worker can walk descriptors beyond the mapped descriptor ring. KASAN reports a 16-byte out-of-bounds read, corresponding to one vring_desc, in the vringh IOTLB path: BUG: KASAN: out-of-bounds in _copy_from_iter Read of size 16 copy_from_iotlb copydesc_iotlb vringh_getdesc_iotlb vdpasim_net_work Cache get_vq_num_max() immediately after reset. Some backends derive it from writable queue-size state, so querying it after SET_NUM may return the current size instead of the device capability. Invalidate the cached value before reset so a failed reset leaves SET_NUM disabled. For VHOST_SET_VRING_NUM, copy the complete vring state once and use the same index and size for validation, vq->num, and set_vq_num(). This ensures that validation and use operate on the same copied values.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS