CVE-2026-90216
Published Sep 17, 2026
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.
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References
Other 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
https://git.kernel.org/stable/c/87b3da4acb860605643ebee312178f13b20744cf
https://git.kernel.org/stable/c/9754f049d5f1945d4c691d1f52824eb8daf8f9be
https://git.kernel.org/stable/c/e3f7e58189bc222971ddc860f1716f37e51ba996
Frequently Asked Questions
What is CVE-2026-90216? +
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.
How do I check if I'm vulnerable to CVE-2026-90216? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.