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CVE-2026-99086

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Last modified

CVE-2026-99086 is a vulnerability of currently unknown severity. 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.

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 38625191f32f77a9d5fc7cc15f4f9b78768bfb33, < 454b67fcc28c18502e47dfb9f067b04c28628ada; >= 118ba36e446c01e3cd34b3eedabf1d9436525e1d, < e9ec5cbbaf4dd3a02ae3d81719f4fcb9b609aa8e; >= 118ba36e446c01e3cd34b3eedabf1d9436525e1d, < fc79aeb86a2c244c1f1894e2d8f2966fe2b60fa2; 824b9c27d7b600520b95f0cab95a47d1b08a9483; fb49f209995f729053c6ee728436f98d78a49b6f; c6138af1f5454c2631a837916fda958ea72c0d71; 3ff70e2e31c419e2230d0c66cb2bfb3b1b414b7f; >= 6.18.16, < 6.18.58; >= 6.1.165, < 6.2; >= 6.6.128, < 6.7; >= 6.12.75, < 6.13; >= 6.19.6, < 6.20
LinuxLinux7.0

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-99086?
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.
How severe is CVE-2026-99086?
Severity scoring for CVE-2026-99086 is pending analysis.
How do I fix CVE-2026-99086?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST