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CVE-2026-99086

dm-integrity: validate the superblock on resume

CVSS score

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EPSS probability

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Risk score

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Published

3 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

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Vulnerability description

DayBreach AI Explanation

Verified against sources

CVE-2026-99086 Linux Kernel dm-integrity Superblock Validation Vulnerability

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%53

Short explanation

A vulnerability exists in the Linux kernel dm-integrity component because dm_integrity_resume() re-reads the superblock without validation. Modified superblocks on suspended devices can lead to out-of-bounds or inconsistent states.

Why does it matter?

Incompatible modifications to the superblock can cause the dm-integrity subsystem to write past designated boundaries and trigger kernel-level instability.

What should be done?

  • Follow the relevant vendor security advisories
  • Apply kernel patches
  • Ensure validated superblocks are checked upon resume
Note on uncertainty

The sources give limited detail on some technical conditions. Review the chain of evidence below before deciding how to act.

Chain of evidence and sources2 verified claims

Linux çekirdeğindeki dm-integrity modülü, askıdan devam etme sırasında süper bloku doğrulamadan yeniden okumaktadır.

S0 · daybreach-canonicalS1 · cvelist

Yapıcı aşamasında hesaplanan yapılar ile süper blok alanları uyuşmadığında indeks sınırı aşılabilmektedir.

S0 · daybreach-canonicalS1 · cvelist
Show the technical text from the sources

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.

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-99086 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1linuxLinux View
2linuxLinux View
Total affected vendors: 1|Products: 2

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
The sources have not yet published a verified CVSS metric.

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

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Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-99086 is associated with the following CWEs:

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')CWE-20: Improper Input Validation

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-99086 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Official Sources and Advisories

https://git.kernel.org/stable/c/454b67fcc28c18502e47dfb9f067b04c28628adavendor-advisoryhttps://git.kernel.org/stable/c/e9ec5cbbaf4dd3a02ae3d81719f4fcb9b609aa8evendor-advisoryhttps://git.kernel.org/stable/c/fc79aeb86a2c244c1f1894e2d8f2966fe2b60fa2vendor-advisory

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CVE-2026-99086 · dm-integrity: validate the superblock on…