CVE-2026-99086
UnknownSummary
In the Linux kernel, dm-integrity does not validate the superblock on resume, allowing a user to modify the superblock on the underlying device while the dm-integrity device is suspended. This can cause a mismatch in in-memory structure sizes and an out-of-bounds write past the journal, including a 512-byte write through a NULL pointer. The fix snapshots the validated superblock in the constructor and refuses to resume if the on-disk geometry changed.
Risk Assessment
This can cause kernel memory corruption, system crash, or potentially be exploited for privilege escalation by a local user able to modify the media. It affects confidentiality, integrity, and availability.
Recommendation
Update the Linux kernel to a version with the fix. Restrict the ability of unprivileged users to modify the dm-integrity superblock.
Other vulnerabilities in Linux kernel
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- CVE-2026-58828High
In multiple functions of base.c, there is a possible use-after-free due to a race condition. This could lead to local escalation of privilege with no additional execution privileges needed.
- CVE-2026-58827High
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- CVE-2026-58826High
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- CVE-2026-99242Unknown
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- CVE-2026-99241Unknown
In the Linux kernel, a missing lock in ntfs_filemap_page_mkwrite() was fixed; it called iomap_page_mkwrite() without holding mapping->invalidate_lock. A concurrent truncate or fallocate could be invalidating pagecache and rewriting the runlist while the write fault mapped blocks and dirtied the folio.
- CVE-2026-99240Unknown
In the Linux kernel, the DAMON subsystem (mm/damon/core) has a division-by-zero bug when a DAMOS quota goal has a target_value of zero. The fix moves handling of this corner case to the core layer by adding validation in damos_commit_quota_goal(), which now returns an error for zero target values.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS