{"id":"CVE-2024-26899","summary":"block: fix deadlock between bd_link_disk_holder and partition scan","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nblock: fix deadlock between bd_link_disk_holder and partition scan\n\n'open_mutex' of gendisk is used to protect open/close block devices. But\nin bd_link_disk_holder(), it is used to protect the creation of symlink\nbetween holding disk and slave bdev, which introduces some issues.\n\nWhen bd_link_disk_holder() is called, the driver is usually in the process\nof initialization/modification and may suspend submitting io. At this\ntime, any io hold 'open_mutex', such as scanning partitions, can cause\ndeadlocks. For example, in raid:\n\nT1                              T2\nbdev_open_by_dev\n lock open_mutex [1]\n ...\n  efi_partition\n  ...\n   md_submit_bio\n\t\t\t\tmd_ioctl mddev_syspend\n\t\t\t\t  -\u003e suspend all io\n\t\t\t\t md_add_new_disk\n\t\t\t\t  bind_rdev_to_array\n\t\t\t\t   bd_link_disk_holder\n\t\t\t\t    try lock open_mutex [2]\n    md_handle_request\n     -\u003e wait mddev_resume\n\nT1 scan partition, T2 add a new device to raid. T1 waits for T2 to resume\nmddev, but T2 waits for open_mutex held by T1. Deadlock occurs.\n\nFix it by introducing a local mutex 'blk_holder_mutex' to replace\n'open_mutex'.","modified":"2026-04-02T10:06:22.295733Z","published":"2024-04-17T10:27:49.089Z","related":["SUSE-SU-2024:2135-1","SUSE-SU-2024:2203-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26899.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/03f12122b20b6e6028e9ed69030a49f9cffcbb75"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1e5c5b0abaee7b62a10b9707a62083b71ad21f62"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5a87c1f7993bc8ac358a3766bac5dc7126e01e98"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26899.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26899"},{"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":"1b0a2d950ee2a54aa04fb31ead32144be0bbf690"},{"fixed":"1e5c5b0abaee7b62a10b9707a62083b71ad21f62"},{"fixed":"5a87c1f7993bc8ac358a3766bac5dc7126e01e98"},{"fixed":"03f12122b20b6e6028e9ed69030a49f9cffcbb75"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26899.json"}}],"schema_version":"1.7.5"}