{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ab3e1d3bbab9e973aeb4dd4603251578658a47ff"
            },
            {
              "fixed": "8d9ddad561136f7e6a9346767bf97b4d79e38e67"
            },
            {
              "fixed": "7daf279c674d515fb22a727a7bbc92aeb35c5442"
            },
            {
              "fixed": "e2e738e8dfbbf83bd2bae0467ec4420cc52da42a"
            },
            {
              "fixed": "b1c1a2637ebd675aa2d71fee8c70da8791d73850"
            },
            {
              "fixed": "83d72091804600ead96dc9e9f518ea56cb4942f6"
            },
            {
              "fixed": "fb8a6c18fb9a6561f7a15b58b272442b77a242dd"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.1.0"
            },
            {
              "fixed": "6.1.165"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.128"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.75"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.16"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43278.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm: clear cloned request bio pointer when last clone bio completes\n\nStale rq-\u003ebio values have been observed to cause double-initialization of\ncloned bios in request-based device-mapper targets, leading to\nuse-after-free and double-free scenarios.\n\nOne such case occurs when using dm-multipath on top of a PCIe NVMe\nnamespace, where cloned request bios are freed during\nblk_complete_request(), but rq-\u003ebio is left intact. Subsequent clone\nteardown then attempts to free the same bios again via\nblk_rq_unprep_clone().\n\nThe resulting double-free path looks like:\n\n  nvme_pci_complete_batch()\n    nvme_complete_batch()\n      blk_mq_end_request_batch()\n        blk_complete_request()        // called on a DM clone request\n          bio_endio()                 // first free of all clone bios\n          ...\n        rq-\u003eend_io()                  // end_clone_request()\n          dm_complete_request(tio-\u003eorig)\n            dm_softirq_done()\n              dm_done()\n                dm_end_request()\n                  blk_rq_unprep_clone()  // second free of clone bios\n\nFix this by clearing the clone request's bio pointer when the last cloned\nbio completes, ensuring that later teardown paths do not attempt to free\nalready-released bios.",
  "id": "CVE-2026-43278",
  "modified": "2026-07-08T05:38:59.990233762Z",
  "published": "2026-05-06T11:29:00.193Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7daf279c674d515fb22a727a7bbc92aeb35c5442"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83d72091804600ead96dc9e9f518ea56cb4942f6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d9ddad561136f7e6a9346767bf97b4d79e38e67"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b1c1a2637ebd675aa2d71fee8c70da8791d73850"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e2e738e8dfbbf83bd2bae0467ec4420cc52da42a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fb8a6c18fb9a6561f7a15b58b272442b77a242dd"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43278.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43278"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/3d746b639be4b4f5cd8ce2b06aa52dc443f50edc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9a95b98202113045bc1a5bcb30388a500f25e050"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "dm: clear cloned request bio pointer when last clone bio completes"
}