CVE-2026-90400

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90400", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.811Z", "datePublished": "2026-09-17T16:09:30.915Z", "dateUpdated": "2026-10-19T09:03:04.317Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:03:04.317Z"}, "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/md.c"], "versions": [{"version": "bc08041b32abe6c9824f78735bac22018eabfc06", "lessThan": "c3777d16bc3335c0ac4bdad0551c80d38c5d94cc", "status": "affected", "versionType": "git"}, {"version": "bc08041b32abe6c9824f78735bac22018eabfc06", "lessThan": "e5ac7ab78467b064f1da8b0f3042a63595fafcfd", "status": "affected", "versionType": "git"}, {"version": "bc08041b32abe6c9824f78735bac22018eabfc06", "lessThan": "81b39df5d701976cf20e52f33106c1fc1603b4cb", "status": "affected", "versionType": "git"}, {"version": "bc08041b32abe6c9824f78735bac22018eabfc06", "lessThan": "c7d34d17ea43ebc86b45d439ebb435e11ca44bca", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/md/md.c"], "versions": [{"version": "6.7", "status": "affected"}, {"version": "0", "lessThan": "6.7", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.110"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.18.52"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/c3777d16bc3335c0ac4bdad0551c80d38c5d94cc"}, {"url": "https://git.kernel.org/stable/c/e5ac7ab78467b064f1da8b0f3042a63595fafcfd"}, {"url": "https://git.kernel.org/stable/c/81b39df5d701976cf20e52f33106c1fc1603b4cb"}, {"url": "https://git.kernel.org/stable/c/c7d34d17ea43ebc86b45d439ebb435e11ca44bca"}], "title": "md: recheck spare changes before starting sync", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"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": "c3777d16bc3335c0ac4bdad0551c80d38c5d94cc", "status": "affected", "version": "bc08041b32abe6c9824f78735bac22018eabfc06", "versionType": "git"}, {"lessThan": "e5ac7ab78467b064f1da8b0f3042a63595fafcfd", "status": "affected", "version": "bc08041b32abe6c9824f78735bac22018eabfc06", "versionType": "git"}, {"lessThan": "81b39df5d701976cf20e52f33106c1fc1603b4cb", "status": "affected", "version": "bc08041b32abe6c9824f78735bac22018eabfc06", "versionType": "git"}, {"lessThan": "c7d34d17ea43ebc86b45d439ebb435e11ca44bca", "status": "affected", "version": "bc08041b32abe6c9824f78735bac22018eabfc06", "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": "6.7"}, {"lessThan": "6.7", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-90400", "lastModified": "2026-10-19T09:19:34.123", "metrics": {}, "published": "2026-09-17T17:17:39.753", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/81b39df5d701976cf20e52f33106c1fc1603b4cb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c3777d16bc3335c0ac4bdad0551c80d38c5d94cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c7d34d17ea43ebc86b45d439ebb435e11ca44bca"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e5ac7ab78467b064f1da8b0f3042a63595fafcfd"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bc08041b32abe6c9824f78735bac22018eabfc06,c3777d16bc3335c0ac4bdad0551c80d38c5d94cc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bc08041b32abe6c9824f78735bac22018eabfc06,e5ac7ab78467b064f1da8b0f3042a63595fafcfd)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bc08041b32abe6c9824f78735bac22018eabfc06,81b39df5d701976cf20e52f33106c1fc1603b4cb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[bc08041b32abe6c9824f78735bac22018eabfc06,c7d34d17ea43ebc86b45d439ebb435e11ca44bca)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "6.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-19T10:45:06.192450+00:00", "title": "Linux kernel RAID subsystem may crash due to null pointer dereference during spare handling", "updated": "2026-09-19T14:30:07.407609+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-476", "CWE-368"]}