{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d8530de5a6e82be0ce17a5fdf727a394bcf6444c"
            },
            {
              "fixed": "d6998ddd507c81e3829489a6ead23f17f5acb7fe"
            },
            {
              "fixed": "f41cf35ee2a1e31374b3f54e7579c55153506e70"
            },
            {
              "fixed": "9818bcae3c0ca1dde4b9a334125c46676e0a9b29"
            },
            {
              "fixed": "aa4c4a9315764b2b7a7182e72cc5ea87520436b4"
            },
            {
              "fixed": "49f06cff50a4ccf3b7a1a662ceb892b3b21a527a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.6.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64326.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nblock: skip sync_blockdev() on surprise removal in bdev_mark_dead()\n\nbdev_mark_dead()'s @surprise == true means the device is already gone.\nThe filesystem callback fs_bdev_mark_dead() honours this and skips\nsync_filesystem(), but the bare block device path (no -\u003emark_dead op)\nlost its !surprise guard when the holder -\u003emark_dead callback was wired\nup (see Fixes), and now calls sync_blockdev() unconditionally, which can\nhang forever waiting on writeback that can no longer complete.\n\nsyzkaller hit this via nvme_reset_work()'s \"I/O queues lost\" path:\nnvme_mark_namespaces_dead() -\u003e blk_mark_disk_dead() -\u003e\nbdev_mark_dead(bdev, true) -\u003e sync_blockdev() blocks in\nfolio_wait_writeback(), wedging the reset worker and every task waiting\non it.\n\nSkip the sync on surprise removal, matching fs_bdev_mark_dead();\ninvalidate_bdev() still runs. Orderly removal (surprise == false) is\nunchanged.\n\nFound by FuzzNvme(Syzkaller with FEMU fuzzing framework).",
  "id": "CVE-2026-64326",
  "modified": "2026-07-27T03:56:15.014778593Z",
  "published": "2026-07-25T08:49:54.327Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/49f06cff50a4ccf3b7a1a662ceb892b3b21a527a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9818bcae3c0ca1dde4b9a334125c46676e0a9b29"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa4c4a9315764b2b7a7182e72cc5ea87520436b4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d6998ddd507c81e3829489a6ead23f17f5acb7fe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f41cf35ee2a1e31374b3f54e7579c55153506e70"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64326.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64326"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "block: skip sync_blockdev() on surprise removal in bdev_mark_dead()"
}