{
  "cveId": "CVE-2026-90400",
  "url": "https://patchblox.com/security/cve/CVE-2026-90400",
  "summary": "CVE-2026-90400 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-90400, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  md: recheck spare changes before starting sync...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  md: recheck spare changes before starting sync  remove_spares() and remove_and_add_spares() modify the array\u0027s rdev configuration. These operations are only safe after the array has been suspended.  md_start_sync() checks whether spare configuration changes are needed before taking reconfig_mutex. However, the rdev state can change before the mutex is acquired, so the initial check can become stale. In that case, md_choose_sync_action() may remove or replace rdevs while normal I/O is still accessing them.  The race can occur as follows:  raid10d          Worker                      Normal IO ____________     _______________________     ______________________                                               raid10_write_request()                                              wait_blocked_dev() set Blocked set Faulty                                              Skip Faulty rdev                                              rrdev-\u003Enr_pending\u002B\u002B                                              .repl_bio = bio                  removeable_rdev = false     .                  array not suspended         . lock mddev                                   goto err_handle                  lock mddev (wait)                  . update sb        . clear Blocked    .                  . unlock mddev     .                  lock mddev (acquires)                  remove_spares()                  removeable_rdev = true                   raid10_remove_disk()                  rdev = replacement                  replacement = NULL                                              rdev_dec_pending(NULL)                  unlock mddev                (NULL)-\u003Enr_pending--  In this case, rdev_dec_pending() is called with a NULL pointer, resulting in a NULL pointer dereference when attempting to decrement nr_pending.  Fix this by suspending the array when spare configuration changes are needed, including for non-read-write arrays, and checking again after taking reconfig_mutex. If the array was not already suspended and a change is now needed, release the mutex, suspend the array, and reacquire the mutex before continuing.",
  "published": "2026-09-17T17:17:39Z",
  "severity": "IMPORTANT",
  "cvss": 5.5,
  "epss": 0.00168,
  "epssPercentile": 0.061,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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