CVE-2025-38048

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

virtio_ring: Fix data race by tagging event_triggered as racy for KCSAN

syzbot reports a data-race when accessing the event_triggered, here is the

simplified stack when the issue occurred:

==================================================================

BUG: KCSAN: data-race in virtqueue_disable_cb / virtqueue_enable_cb_delayed

write to 0xffff8881025bc452 of 1 bytes by task 3288 on cpu 0:

virtqueue_enable_cb_delayed+0x42/0x3c0 drivers/virtio/virtio_ring.c:2653

start_xmit+0x230/0x1310 drivers/net/virtio_net.c:3264

__netdev_start_xmit include/linux/netdevice.h:5151 [inline]

netdev_start_xmit include/linux/netdevice.h:5160 [inline]

xmit_one net/core/dev.c:3800 [inline]

read to 0xffff8881025bc452 of 1 bytes by interrupt on cpu 1:

virtqueue_disable_cb_split drivers/virtio/virtio_ring.c:880 [inline]

virtqueue_disable_cb+0x92/0x180 drivers/virtio/virtio_ring.c:2566

skb_xmit_done+0x5f/0x140 drivers/net/virtio_ne

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References