{
  "cveId": "CVE-2026-90187",
  "url": "https://patchblox.com/security/cve/CVE-2026-90187",
  "summary": "CVE-2026-90187 is fixed in 74 products on 1 platform, first by DEBIAN-CVE-2026-90187, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  null_blk: free zones array on device power-off...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  null_blk: free zones array on device power-off  null_init_zoned_dev() allocates dev-\u003Ezones when a zoned device is powered on, but null_del_dev() never frees it on power-off; dev-\u003Ezones is only freed later in null_free_dev(), when the configfs directory is removed. If the device is powered off and then on again, null_init_zoned_dev() allocates a new array and overwrites the dev-\u003Ezones pointer, leaking the previous allocation each power cycle.  Free dev-\u003Ezones in null_del_dev() via null_free_zoned_dev() to solve it. And calling null_free_zoned_dev() in null_free_dev() is no longer necessary because every caller already invokes null_del_dev() first: via nullb_group_drop_item() before nullb_device_release(), in the null_add_dev() error path of null_create_dev(), and in null_destroy_dev(). Remove the redundant call.  And take \u0026lock around zone_cond_store() in the two store wrappers to serialize dev-\u003Ezones check-and-deref against its alloc/free, which already run under \u0026lock. The reason there was no problem before is that only nullb_device_release() or null_exit() frees the dev-\u003Ezones, which guarantees that subsequent users won\u0027t access the configfs interface.",
  "published": "2026-09-17T17:17:13Z",
  "severity": "IMPORTANT",
  "cvss": 7.8,
  "epss": 0.00206,
  "epssPercentile": 0.10759,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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