CVE-2026-90216 Affecting linux-6.12 package, versions <6.12.111-1~deb12u1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN12-LINUX612-20507207
- published5 Oct 2026
- disclosed17 Sept 2026
Introduced: 17 Sep 2026
NewCVE-2026-90216 (opens in a new tab)How to fix?
Upgrade Debian:12 linux-6.12 to version 6.12.111-1~deb12u1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linux-6.12 package and not the linux-6.12 package as distributed by Debian.
See How to fix? for Debian:12 relevant fixed versions and status.
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://security-tracker.debian.org/tracker/CVE-2026-90216
- 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