{"id":"CVE-2025-68368","summary":"md: init bioset in mddev_init","details":"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.","modified":"2026-03-20T12:46:23.255979Z","published":"2025-12-24T10:32:54.765Z","related":["SUSE-SU-2026:20555-1","SUSE-SU-2026:20599-1","SUSE-SU-2026:20615-1","openSUSE-SU-2026:10039-1","openSUSE-SU-2026:10301-1","openSUSE-SU-2026:20287-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68368.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/381a3ce1c0ffed647c9b913e142b099c7e9d5afc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9d37fe37dfa0833a8768740f0575e0ffd793cb4a"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68368.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-68368"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d981ed8419303ed12351eea8541ad6cb76455fe3"},{"fixed":"9d37fe37dfa0833a8768740f0575e0ffd793cb4a"},{"fixed":"381a3ce1c0ffed647c9b913e142b099c7e9d5afc"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-68368.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.12.0"},{"fixed":"6.18.2"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-68368.json"}}],"schema_version":"1.7.5"}