{"id":"CVE-2026-90400","revision":null,"records":[{"revision":"856d8b1f1aea48d4a1fc20db89d6d897","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90400","aliases":[],"title":"md: recheck spare changes before starting sync","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmd: recheck spare changes before starting sync\n\nremove_spares() and remove_and_add_spares() modify the array's rdev\nconfiguration. These operations are only safe after the array has been\nsuspended.\n\nmd_start_sync() checks whether spare configuration changes are needed\nbefore taking reconfig_mutex. However, the rdev state can change before\nthe mutex is acquired, so the initial check can become stale. In that\ncase, md_choose_sync_action() may remove or replace rdevs while normal\nI/O is still accessing them.\n\nThe race can occur as follows:\n\nraid10d Worker Normal IO\n____________ _______________________ ______________________\n\n raid10_write_request()\n wait_blocked_dev()\nset Blocked\nset Faulty\n Skip Faulty rdev\n rrdev->nr_pending++\n .repl_bio = bio\n removeable_rdev = false .\n array not suspended .\nlock mddev goto err_handle\n lock mddev (wait)\n .\nupdate sb .\nclear Blocked .\n .\nunlock mddev .\n lock mddev (acquires)\n remove_spares()\n removeable_rdev = true\n\n raid10_remove_disk()\n rdev = replacement\n replacement = NULL\n rdev_dec_pending(NULL)\n unlock mddev (NULL)->nr_pending--\n\nIn this case, rdev_dec_pending() is called with a NULL pointer,\nresulting in a NULL pointer dereference when attempting to decrement\nnr_pending.\n\nFix this by suspending the array when spare configuration changes are\nneeded, including for non-read-write arrays, and checking again after\ntaking reconfig_mutex. If the array was not already suspended and a\nchange is now needed, release the mutex, suspend the array, and\nreacquire the mutex before continuing.","state":0,"publishedAt":"2026-09-17T16:09:30.915+00:00","modifiedAt":"2026-10-19T09:03:04.317+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/md/md.c\"\n ],\n \"versions\": [\n {\n \"version\": \"bc08041b32abe6c9824f78735bac22018eabfc06\",\n \"lessThan\": \"c3777d16bc3335c0ac4bdad0551c80d38c5d94cc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bc08041b32abe6c9824f78735bac22018eabfc06\",\n \"lessThan\": \"e5ac7ab78467b064f1da8b0f3042a63595fafcfd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bc08041b32abe6c9824f78735bac22018eabfc06\",\n \"lessThan\": \"81b39df5d701976cf20e52f33106c1fc1603b4cb\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"bc08041b32abe6c9824f78735bac22018eabfc06\",\n \"lessThan\": \"c7d34d17ea43ebc86b45d439ebb435e11ca44bca\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"drivers/md/md.c\"\n ],\n \"versions\": [\n {\n \"version\": \"6.7\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"6.7\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.110\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.52\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2.6\",\n \"lessThanOrEqual\": \"7.2.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.3\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/c3777d16bc3335c0ac4bdad0551c80d38c5d94cc","https://git.kernel.org/stable/c/e5ac7ab78467b064f1da8b0f3042a63595fafcfd","https://git.kernel.org/stable/c/81b39df5d701976cf20e52f33106c1fc1603b4cb","https://git.kernel.org/stable/c/c7d34d17ea43ebc86b45d439ebb435e11ca44bca"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90400","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90400","identifiers":["CVE-2026-90400"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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