ubi: Fix rollback for explicit UBI device numbers

In the Linux kernel, the following vulnerability has been resolved: ubi: Fix rollback for explicit UBI device numbers ubi_init_attach() rolls back module initialization failures by scanning ubi_devices[0..i-1], where i is the mtd= parameter index. That assumes the parameter index matches the UBI device number. That assumption is not true when mtd= specifies an explicit ubi_num. A successfully attached device can be stored at a higher ubi_devices[] slot, and a later failure can miss it during rollback. Scan the full ubi_devices[] array and detach by the actual array index, matching the way UBI devices are stored.

Source published

17 Sep 2026 16:07:28 UTC

Source modified

19 Oct 2026 08:59:52 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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