CVE-2026-90216

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux83ff59a066637a6c28844bbf43009459408240f4 < 83c978921688af40dcab6db74882d1ff9b0b765caffected
LinuxLinux83ff59a066637a6c28844bbf43009459408240f4 < 6b92e66ec6dd8019e8efb2a568ef7c967c5a18c5affected
LinuxLinux83ff59a066637a6c28844bbf43009459408240f4 < 4417ab6ecad01cf2d01045ef8104c95a66b0e893affected
LinuxLinux83ff59a066637a6c28844bbf43009459408240f4 < 552e565ed8846e7db143e4a6bdf3f5677453c686affected
LinuxLinux83ff59a066637a6c28844bbf43009459408240f4 < 9754f049d5f1945d4c691d1f52824eb8daf8f9beaffected
LinuxLinux83ff59a066637a6c28844bbf43009459408240f4 < e3f7e58189bc222971ddc860f1716f37e51ba996affected
LinuxLinux83ff59a066637a6c28844bbf43009459408240f4 < 87b3da4acb860605643ebee312178f13b20744cfaffected
LinuxLinux83ff59a066637a6c28844bbf43009459408240f4 < 5b0a6b554e12a97f9771a9a9f4ea1f5457373c73affected
LinuxLinux3.11affected
LinuxLinux0 < 3.11unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References