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

Vulnerability from cvelistv5 – Published: 2025-12-24 10:32 – Updated: 2026-05-11 21:51
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 , ≤ * (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",
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          "product": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "version": "6.12"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.18.2",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "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",
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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": "2026-05-11T21:51:51.317Z",
        "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": "2026-05-11T21:51:51.317Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-68368",
      "date": "2026-06-06",
      "epss": "0.0003",
      "percentile": "0.09127"
    },
    "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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