{"api_version":"1","generated_at":"2026-06-25T15:49:47+00:00","cve":"CVE-2026-53125","urls":{"html":"https://cve.report/CVE-2026-53125","api":"https://cve.report/api/cve/CVE-2026-53125.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-53125","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-53125"},"summary":{"title":"md: fix array_state=clear sysfs deadlock","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmd: fix array_state=clear sysfs deadlock\n\nWhen \"clear\" is written to array_state, md_attr_store() breaks sysfs\nactive protection so the array can delete itself from its own sysfs\nstore method.\n\nHowever, md_attr_store() currently drops the mddev reference before\ncalling sysfs_unbreak_active_protection(). Once do_md_stop(..., 0)\nhas made the mddev eligible for delayed deletion, the temporary\nkobject reference taken by sysfs_break_active_protection() can become\nthe last kobject reference protecting the md kobject.\n\nThat allows sysfs_unbreak_active_protection() to drop the last\nkobject reference from the current sysfs writer context. kobject\nteardown then recurses into kernfs removal while the current sysfs\nnode is still being unwound, and lockdep reports recursive locking on\nkn->active with kernfs_drain() in the call chain.\n\nReproducer on an existing level:\n1. Create an md0 linear array and activate it:\n   mknod /dev/md0 b 9 0\n   echo none > /sys/block/md0/md/metadata_version\n   echo linear > /sys/block/md0/md/level\n   echo 1 > /sys/block/md0/md/raid_disks\n   echo \"$(cat /sys/class/block/sdb/dev)\" > /sys/block/md0/md/new_dev\n   echo \"$(($(cat /sys/class/block/sdb/size) / 2))\" > \\\n\t/sys/block/md0/md/dev-sdb/size\n   echo 0 > /sys/block/md0/md/dev-sdb/slot\n   echo active > /sys/block/md0/md/array_state\n2. Wait briefly for the array to settle, then clear it:\n   sleep 2\n   echo clear > /sys/block/md0/md/array_state\n\nThe warning looks like:\n\n  WARNING: possible recursive locking detected\n  bash/588 is trying to acquire lock:\n  (kn->active#65) at __kernfs_remove+0x157/0x1d0\n  but task is already holding lock:\n  (kn->active#65) at sysfs_unbreak_active_protection+0x1f/0x40\n  ...\n  Call Trace:\n   kernfs_drain\n   __kernfs_remove\n   kernfs_remove_by_name_ns\n   sysfs_remove_group\n   sysfs_remove_groups\n   __kobject_del\n   kobject_put\n   md_attr_store\n   kernfs_fop_write_iter\n   vfs_write\n   ksys_write\n\nRestore active protection before mddev_put() so the extra sysfs\nkobject reference is dropped while the mddev is still held alive. The\nactual md kobject deletion is then deferred until after the sysfs\nwrite path has fully returned.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-24 17:17:27","updated_at":"2026-06-24 17:17:27"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/2aa72276fab9851dbd59c2daeb4b590c5a113908","name":"https://git.kernel.org/stable/c/2aa72276fab9851dbd59c2daeb4b590c5a113908","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/62c44566da7493ee48ef17e8507bb798338a07cb","name":"https://git.kernel.org/stable/c/62c44566da7493ee48ef17e8507bb798338a07cb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/92ad0ec509ffb188d8f849b63148664df37b4a52","name":"https://git.kernel.org/stable/c/92ad0ec509ffb188d8f849b63148664df37b4a52","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-53125","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53125","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9e59d609763f70a992a8f3808dabcce60f14eb5c 62c44566da7493ee48ef17e8507bb798338a07cb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9e59d609763f70a992a8f3808dabcce60f14eb5c 92ad0ec509ffb188d8f849b63148664df37b4a52 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 9e59d609763f70a992a8f3808dabcce60f14eb5c 2aa72276fab9851dbd59c2daeb4b590c5a113908 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.33 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.10 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"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":[{"lessThan":"62c44566da7493ee48ef17e8507bb798338a07cb","status":"affected","version":"9e59d609763f70a992a8f3808dabcce60f14eb5c","versionType":"git"},{"lessThan":"92ad0ec509ffb188d8f849b63148664df37b4a52","status":"affected","version":"9e59d609763f70a992a8f3808dabcce60f14eb5c","versionType":"git"},{"lessThan":"2aa72276fab9851dbd59c2daeb4b590c5a113908","status":"affected","version":"9e59d609763f70a992a8f3808dabcce60f14eb5c","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/md/md.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.17"},{"lessThan":"6.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.33","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.33","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.10","versionStartIncluding":"6.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"6.17","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nmd: fix array_state=clear sysfs deadlock\n\nWhen \"clear\" is written to array_state, md_attr_store() breaks sysfs\nactive protection so the array can delete itself from its own sysfs\nstore method.\n\nHowever, md_attr_store() currently drops the mddev reference before\ncalling sysfs_unbreak_active_protection(). Once do_md_stop(..., 0)\nhas made the mddev eligible for delayed deletion, the temporary\nkobject reference taken by sysfs_break_active_protection() can become\nthe last kobject reference protecting the md kobject.\n\nThat allows sysfs_unbreak_active_protection() to drop the last\nkobject reference from the current sysfs writer context. kobject\nteardown then recurses into kernfs removal while the current sysfs\nnode is still being unwound, and lockdep reports recursive locking on\nkn->active with kernfs_drain() in the call chain.\n\nReproducer on an existing level:\n1. Create an md0 linear array and activate it:\n   mknod /dev/md0 b 9 0\n   echo none > /sys/block/md0/md/metadata_version\n   echo linear > /sys/block/md0/md/level\n   echo 1 > /sys/block/md0/md/raid_disks\n   echo \"$(cat /sys/class/block/sdb/dev)\" > /sys/block/md0/md/new_dev\n   echo \"$(($(cat /sys/class/block/sdb/size) / 2))\" > \\\n\t/sys/block/md0/md/dev-sdb/size\n   echo 0 > /sys/block/md0/md/dev-sdb/slot\n   echo active > /sys/block/md0/md/array_state\n2. Wait briefly for the array to settle, then clear it:\n   sleep 2\n   echo clear > /sys/block/md0/md/array_state\n\nThe warning looks like:\n\n  WARNING: possible recursive locking detected\n  bash/588 is trying to acquire lock:\n  (kn->active#65) at __kernfs_remove+0x157/0x1d0\n  but task is already holding lock:\n  (kn->active#65) at sysfs_unbreak_active_protection+0x1f/0x40\n  ...\n  Call Trace:\n   kernfs_drain\n   __kernfs_remove\n   kernfs_remove_by_name_ns\n   sysfs_remove_group\n   sysfs_remove_groups\n   __kobject_del\n   kobject_put\n   md_attr_store\n   kernfs_fop_write_iter\n   vfs_write\n   ksys_write\n\nRestore active protection before mddev_put() so the extra sysfs\nkobject reference is dropped while the mddev is still held alive. The\nactual md kobject deletion is then deferred until after the sysfs\nwrite path has fully returned."}],"providerMetadata":{"dateUpdated":"2026-06-24T16:30:53.934Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/62c44566da7493ee48ef17e8507bb798338a07cb"},{"url":"https://git.kernel.org/stable/c/92ad0ec509ffb188d8f849b63148664df37b4a52"},{"url":"https://git.kernel.org/stable/c/2aa72276fab9851dbd59c2daeb4b590c5a113908"}],"title":"md: fix array_state=clear sysfs deadlock","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-53125","datePublished":"2026-06-24T16:30:53.934Z","dateReserved":"2026-06-09T07:44:35.386Z","dateUpdated":"2026-06-24T16:30:53.934Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-24 17:17:27","lastModifiedDate":"2026-06-24 17:17:27","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"53125","Ordinal":"1","Title":"md: fix array_state=clear sysfs deadlock","CVE":"CVE-2026-53125","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"53125","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nmd: fix array_state=clear sysfs deadlock\n\nWhen \"clear\" is written to array_state, md_attr_store() breaks sysfs\nactive protection so the array can delete itself from its own sysfs\nstore method.\n\nHowever, md_attr_store() currently drops the mddev reference before\ncalling sysfs_unbreak_active_protection(). Once do_md_stop(..., 0)\nhas made the mddev eligible for delayed deletion, the temporary\nkobject reference taken by sysfs_break_active_protection() can become\nthe last kobject reference protecting the md kobject.\n\nThat allows sysfs_unbreak_active_protection() to drop the last\nkobject reference from the current sysfs writer context. kobject\nteardown then recurses into kernfs removal while the current sysfs\nnode is still being unwound, and lockdep reports recursive locking on\nkn->active with kernfs_drain() in the call chain.\n\nReproducer on an existing level:\n1. Create an md0 linear array and activate it:\n   mknod /dev/md0 b 9 0\n   echo none > /sys/block/md0/md/metadata_version\n   echo linear > /sys/block/md0/md/level\n   echo 1 > /sys/block/md0/md/raid_disks\n   echo \"$(cat /sys/class/block/sdb/dev)\" > /sys/block/md0/md/new_dev\n   echo \"$(($(cat /sys/class/block/sdb/size) / 2))\" > \\\n\t/sys/block/md0/md/dev-sdb/size\n   echo 0 > /sys/block/md0/md/dev-sdb/slot\n   echo active > /sys/block/md0/md/array_state\n2. Wait briefly for the array to settle, then clear it:\n   sleep 2\n   echo clear > /sys/block/md0/md/array_state\n\nThe warning looks like:\n\n  WARNING: possible recursive locking detected\n  bash/588 is trying to acquire lock:\n  (kn->active#65) at __kernfs_remove+0x157/0x1d0\n  but task is already holding lock:\n  (kn->active#65) at sysfs_unbreak_active_protection+0x1f/0x40\n  ...\n  Call Trace:\n   kernfs_drain\n   __kernfs_remove\n   kernfs_remove_by_name_ns\n   sysfs_remove_group\n   sysfs_remove_groups\n   __kobject_del\n   kobject_put\n   md_attr_store\n   kernfs_fop_write_iter\n   vfs_write\n   ksys_write\n\nRestore active protection before mddev_put() so the extra sysfs\nkobject reference is dropped while the mddev is still held alive. The\nactual md kobject deletion is then deferred until after the sysfs\nwrite path has fully returned.","Type":"Description","Title":"md: fix array_state=clear sysfs deadlock"}]}}}