CVE-2026-97995
UnknownSummary
In the Linux kernel, the virtio_console module has a bug where control-out buffers are freed on device removal. __send_control_msg() publishes &portdev->cpkt as the control-out virtqueue cookie, and remove_vqs() passes leftover cookies to free_buf(), which treats them as struct port_buffer and reads sgpages. If a control message is still on c_ovq when the device is unbound, free_buf() reads past the ports_device object, reported by KASAN as slab-out-of-bounds.
Risk Assessment
Can lead to an out-of-bounds read and potential kernel crash or data exposure. Requires the ability to unbind a virtio_console device.
Recommendation
Update the Linux kernel to a version containing the fix. The fix drains c_ovq without freeing, since the packet lives in portdev and is released with it.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: virtio_console: do not free control-out buffers on remove __send_control_msg() publishes &portdev->cpkt as the control-out virtqueue cookie. remove_vqs() walks every virtqueue and passes leftover cookies to free_buf(), which treats them as struct port_buffer and reads sgpages. If a control message is still on c_ovq when the device is unbound, free_buf() reads past the ports_device object. KASAN reported slab-out-of-bounds in free_buf(): free_buf remove_vqs virtcons_remove unbind_store The object was the ports_device allocated in virtcons_probe(). Drain c_ovq without freeing. The packet lives in portdev and is released with it.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS