{
  "threat_severity" : "Moderate",
  "public_date" : "2026-05-06T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: dm: clear cloned request bio pointer when last clone bio completes",
    "id" : "2467171",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2467171"
  },
  "cvss3" : {
    "cvss3_base_score" : "7.0",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-825",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\ndm: clear cloned request bio pointer when last clone bio completes\nStale rq->bio 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.\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->bio is left intact. Subsequent clone\nteardown then attempts to free the same bios again via\nblk_rq_unprep_clone().\nThe resulting double-free path looks like:\nnvme_pci_complete_batch()\nnvme_complete_batch()\nblk_mq_end_request_batch()\nblk_complete_request()        // called on a DM clone request\nbio_endio()                 // first free of all clone bios\n...\nrq->end_io()                  // end_clone_request()\ndm_complete_request(tio->orig)\ndm_softirq_done()\ndm_done()\ndm_end_request()\nblk_rq_unprep_clone()  // second free of clone bios\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.", "A flaw was found in the Linux kernel's device-mapper (dm) component, specifically affecting request-based device-mapper targets like dm-multipath. Stale bio pointers in cloned requests can lead to double-initialization and subsequent double-free scenarios of cloned bios. This memory corruption vulnerability could potentially allow a local attacker to cause a denial of service or escalate privileges." ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:10"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-43278\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-43278\nhttps://lore.kernel.org/linux-cve-announce/2026050613-CVE-2026-43278-95fa@gregkh/T" ],
  "name" : "CVE-2026-43278",
  "csaw" : false
}