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

{
  "id": "b80f229ed79deecb6bc1f73cc397f11924797ef9ac096e5c632454e86e624435",
  "url": "https://osv.dev/vulnerability/CVE-2025-38048",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "virtio_ring: Fix data race by tagging event_triggered as racy for KCSAN",
    "summary": "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_net.c:777 vring_interrupt+0x161/0x190 drivers/virtio/virtio_ring.c:2715 __handle_irq_event_percpu+0x95/0x490 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] value changed: 0x01 -> 0x00 ================================================================== When the data race occurs, the function virtqueue_enable_cb_delayed() sets event_triggered to false, and virtqueue_disable_cb_split/packed() reads it as false due to the race condition. Since event_triggered is an unreliable hint ",
    "evidence": "osv:CVE-2025-38048",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.185",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.141",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.93",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.31",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.14.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-38048",
      "aliases": [
        "CVE-2025-38048"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "8d622d21d24803408b256d96463eac4574dcf067"
                },
                {
                  "fixed": "02d2d6caee3abc9335cfca35f8eb4492173ae6f2"
                },
                {
                  "fixed": "b6d6419548286b2b9d2b90df824d3cab797f6ae8"
                },
                {
                  "fixed": "b49b5132e4c7307599492aee1cdc6d89f7f2a7da"
                },
                {
                  "fixed": "b730cb109633c455ce8a7cd6934986c6a16d88d8"
                },
                {
                  "fixed": "4ed8f0e808b3fcc71c5b8be7902d8738ed595b17"
                },
                {
                  "fixed": "2e2f925fe737576df2373931c95e1a2b66efdfef"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38048.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.14.0"
                },
                {
                  "fixed": "5.15.185"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.141"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.93"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.31"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.14.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38048.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:51.699157216Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/02d2d6caee3abc9335cfca35f8eb4492173ae6f2",
        "https://git.kernel.org/stable/c/2e2f925fe737576df2373931c95e1a2b66efdfef",
        "https://git.kernel.org/stable/c/4ed8f0e808b3fcc71c5b8be7902d8738ed595b17",
        "https://git.kernel.org/stable/c/b49b5132e4c7307599492aee1cdc6d89f7f2a7da",
        "https://git.kernel.org/stable/c/b6d6419548286b2b9d2b90df824d3cab797f6ae8",
        "https://git.kernel.org/stable/c/b730cb109633c455ce8a7cd6934986c6a16d88d8",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38048.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38048",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38048.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38048",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 520132,
  "published_at": "2025-06-18T09:33:31.413+00:00"
}