CVE-2025-68368 (GCVE-0-2025-68368)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:32 – Updated: 2025-12-24 10:32
VLAI?
Title
md: init bioset in mddev_init
Summary
In the Linux kernel, the following vulnerability has been resolved: md: init bioset in mddev_init IO operations may be needed before md_run(), such as updating metadata after writing sysfs. Without bioset, this triggers a NULL pointer dereference as below: BUG: kernel NULL pointer dereference, address: 0000000000000020 Call Trace: md_update_sb+0x658/0xe00 new_level_store+0xc5/0x120 md_attr_store+0xc9/0x1e0 sysfs_kf_write+0x6f/0xa0 kernfs_fop_write_iter+0x141/0x2a0 vfs_write+0x1fc/0x5a0 ksys_write+0x79/0x180 __x64_sys_write+0x1d/0x30 x64_sys_call+0x2818/0x2880 do_syscall_64+0xa9/0x580 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Reproducer ``` mdadm -CR /dev/md0 -l1 -n2 /dev/sd[cd] echo inactive > /sys/block/md0/md/array_state echo 10 > /sys/block/md0/md/new_level ``` mddev_init() can only be called once per mddev, no need to test if bioset has been initialized anymore.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: d981ed8419303ed12351eea8541ad6cb76455fe3 , < 9d37fe37dfa0833a8768740f0575e0ffd793cb4a (git)
Affected: d981ed8419303ed12351eea8541ad6cb76455fe3 , < 381a3ce1c0ffed647c9b913e142b099c7e9d5afc (git)
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    Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.18.2 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/md/md.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "d981ed8419303ed12351eea8541ad6cb76455fe3",
              "versionType": "git"
            },
            {
              "lessThan": "381a3ce1c0ffed647c9b913e142b099c7e9d5afc",
              "status": "affected",
              "version": "d981ed8419303ed12351eea8541ad6cb76455fe3",
              "versionType": "git"
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6.12"
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            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.2",
              "versionType": "semver"
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc1",
              "versionType": "original_commit_for_fix"
            }
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      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.2",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19-rc1",
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                  "vulnerable": true
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd: init bioset in mddev_init\n\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:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000020\n Call Trace:\n  md_update_sb+0x658/0xe00\n  new_level_store+0xc5/0x120\n  md_attr_store+0xc9/0x1e0\n  sysfs_kf_write+0x6f/0xa0\n  kernfs_fop_write_iter+0x141/0x2a0\n  vfs_write+0x1fc/0x5a0\n  ksys_write+0x79/0x180\n  __x64_sys_write+0x1d/0x30\n  x64_sys_call+0x2818/0x2880\n  do_syscall_64+0xa9/0x580\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n\nReproducer\n```\n  mdadm -CR /dev/md0 -l1 -n2 /dev/sd[cd]\n  echo inactive \u003e /sys/block/md0/md/array_state\n  echo 10 \u003e /sys/block/md0/md/new_level\n```\n\nmddev_init() can only be called once per mddev, no need to test if bioset\nhas been initialized anymore."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T10:32:54.765Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9d37fe37dfa0833a8768740f0575e0ffd793cb4a"
        },
        {
          "url": "https://git.kernel.org/stable/c/381a3ce1c0ffed647c9b913e142b099c7e9d5afc"
        }
      ],
      "title": "md: init bioset in mddev_init",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68368",
    "datePublished": "2025-12-24T10:32:54.765Z",
    "dateReserved": "2025-12-16T14:48:05.309Z",
    "dateUpdated": "2025-12-24T10:32:54.765Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-68368\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T11:16:00.373\",\"lastModified\":\"2025-12-29T15:58:34.503\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmd: init bioset in mddev_init\\n\\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:\\n\\n BUG: kernel NULL pointer dereference, address: 0000000000000020\\n Call Trace:\\n  md_update_sb+0x658/0xe00\\n  new_level_store+0xc5/0x120\\n  md_attr_store+0xc9/0x1e0\\n  sysfs_kf_write+0x6f/0xa0\\n  kernfs_fop_write_iter+0x141/0x2a0\\n  vfs_write+0x1fc/0x5a0\\n  ksys_write+0x79/0x180\\n  __x64_sys_write+0x1d/0x30\\n  x64_sys_call+0x2818/0x2880\\n  do_syscall_64+0xa9/0x580\\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\\n\\nReproducer\\n```\\n  mdadm -CR /dev/md0 -l1 -n2 /dev/sd[cd]\\n  echo inactive \u003e /sys/block/md0/md/array_state\\n  echo 10 \u003e /sys/block/md0/md/new_level\\n```\\n\\nmddev_init() can only be called once per mddev, no need to test if bioset\\nhas been initialized anymore.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/381a3ce1c0ffed647c9b913e142b099c7e9d5afc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9d37fe37dfa0833a8768740f0575e0ffd793cb4a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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