CVE-2026-99086 dm-integrity: validate the superblock on resume
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99086?
CVE-2026-99086 is a vulnerability in Linux, published on 23 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
dm-integrity: validate the superblock on resume
dm_integrity_resume() re-reads the superblock from the device so that it picks up the flags and the recalculate position. It performs no validation on the result, while the constructor validates the superblock it reads and sizes all the in-memory structures according to it. The user may modify the superblock on the underlying device while the dm-integrity device is suspended, so that the two no longer agree.
In particular, access_journal_data() shifts the journal entry index by ic->sb->log2_sectors_per_block, while ic->journal_section_sectors and the journal page list were computed with the value that was present at constructor time. Increasing log2_sectors_per_block makes the index run past the end of the journal, and dm-integrity then writes 512 bytes through lowmem_page_address(NULL).
Snapshot the validated superblock in the constructor and refuse to resume if any of the fields that describe the on-disk geometry changed.
Which versions are affected by CVE-2026-99086?
How do I fix CVE-2026-99086?
Upgrade to a fixed version.
Is CVE-2026-99086 being exploited?
There is no known exploitation of CVE-2026-99086 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-99086, DEBIAN-CVE-2026-99086, GHSA-ppgf-6cf3-2qjr, UBUNTU-CVE-2026-99086.