zloop: fix KASAN use-after-free of tag set

{
  "id": "3223da816e56bfed90c829a04af3d9f563abe0e3611b5ac40dac6cf71052e120",
  "url": "https://osv.dev/vulnerability/CVE-2025-38620",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "zloop: fix KASAN use-after-free of tag set",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: zloop: fix KASAN use-after-free of tag set When a zoned loop device, or zloop device, is removed, KASAN enabled kernel reports \"BUG KASAN use-after-free\" in blk_mq_free_tag_set(). The BUG happens because zloop_ctl_remove() calls put_disk(), which invokes zloop_free_disk(). The zloop_free_disk() frees the memory allocated for the zlo pointer. However, after the memory is freed, zloop_ctl_remove() calls blk_mq_free_tag_set(&zlo->tag_set), which accesses the freed zlo. Hence the KASAN use-after-free. zloop_ctl_remove() put_disk(zlo->disk) put_device() kobject_put() ... zloop_free_disk() kvfree(zlo) blk_mq_free_tag_set(&zlo->tag_set) To avoid the BUG, move the call to blk_mq_free_tag_set(&zlo->tag_set) from zloop_ctl_remove() into zloop_free_disk(). This ensures that the tag_set is freed before the call to kvfree(zlo).",
    "evidence": "osv:CVE-2025-38620",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.16.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2025-38620",
      "aliases": [
        "CVE-2025-38620"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "eb0570c7df23c2f32fe899fcdaf8fca9a5ecd51e"
                },
                {
                  "fixed": "c7c87046b41a9ef28ee7ac476c369da5b5228bc5"
                },
                {
                  "fixed": "765761851d89c772f482494d452e266795460278"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38620.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.16.1"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38620.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.455285309Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/765761851d89c772f482494d452e266795460278",
        "https://git.kernel.org/stable/c/c7c87046b41a9ef28ee7ac476c369da5b5228bc5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38620.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38620",
        "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-2025-38620.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38620",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 492739,
  "published_at": "2025-08-22T16:00:24.445+00:00"
}