CVE-2026-90216

Description

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.

References

• https://git.kernel.org/stable/c/4417ab6ecad01cf2d01045ef8104c95a66b0e893
• https://git.kernel.org/stable/c/552e565ed8846e7db143e4a6bdf3f5677453c686
• https://git.kernel.org/stable/c/5b0a6b554e12a97f9771a9a9f4ea1f5457373c73
• https://git.kernel.org/stable/c/6b92e66ec6dd8019e8efb2a568ef7c967c5a18c5
• https://git.kernel.org/stable/c/83c978921688af40dcab6db74882d1ff9b0b765c