{
  "threat_severity" : "Moderate",
  "public_date" : "2025-12-24T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: Kernel: Denial of Service in md driver via uninitialized bioset",
    "id" : "2424882",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2424882"
  },
  "cvss3" : {
    "cvss3_base_score" : "5.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
    "status" : "draft"
  },
  "cwe" : "CWE-476",
  "details" : [ "In the Linux kernel, the following vulnerability has been resolved:\nmd: init bioset in mddev_init\nIO operations may be needed before md_run(), such as updating metadata\nafter writing sysfs. Without bioset, this triggers a NULL pointer\ndereference as below:\nBUG: kernel NULL pointer dereference, address: 0000000000000020\nCall Trace:\nmd_update_sb+0x658/0xe00\nnew_level_store+0xc5/0x120\nmd_attr_store+0xc9/0x1e0\nsysfs_kf_write+0x6f/0xa0\nkernfs_fop_write_iter+0x141/0x2a0\nvfs_write+0x1fc/0x5a0\nksys_write+0x79/0x180\n__x64_sys_write+0x1d/0x30\nx64_sys_call+0x2818/0x2880\ndo_syscall_64+0xa9/0x580\nentry_SYSCALL_64_after_hwframe+0x4b/0x53\nReproducer\n```\nmdadm -CR /dev/md0 -l1 -n2 /dev/sd[cd]\necho inactive > /sys/block/md0/md/array_state\necho 10 > /sys/block/md0/md/new_level\n```\nmddev_init() can only be called once per mddev, no need to test if bioset\nhas been initialized anymore.", "A flaw was found in the Linux kernel's Multiple Device (md) driver. A local user can exploit this vulnerability by performing specific operations on `mdadm` (Multiple Device Administration) and `sysfs` (a virtual filesystem providing an interface to kernel data structures). This can lead to a NULL pointer dereference because the `bioset` is not properly initialized before I/O operations, resulting in a system crash and a Denial of Service (DoS)." ],
  "package_state" : [ {
    "product_name" : "Red Hat Enterprise Linux 10",
    "fix_state" : "Fix deferred",
    "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" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 7",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:7"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 8",
    "fix_state" : "Not affected",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:8"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  }, {
    "product_name" : "Red Hat Enterprise Linux 9",
    "fix_state" : "Fix deferred",
    "package_name" : "kernel-rt",
    "cpe" : "cpe:/o:redhat:enterprise_linux:9"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2025-68368\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-68368\nhttps://lore.kernel.org/linux-cve-announce/2025122400-CVE-2025-68368-4e1b@gregkh/T" ],
  "name" : "CVE-2025-68368",
  "csaw" : false
}