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CVE-2026-46107

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: dm-thin: fix metadata refcount underflow There's a bug in dm-thin in the function rebalance_children.

Published May 28, 2026CWE-191EPSS 0.13%

Overview

CVE-2026-46107 is a high-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

dm-thin: fix metadata refcount underflow

There's a bug in dm-thin in the function rebalance_children. If the

internal btree node has one entry, the code tries to copy all btree

entries from the node's child to the node itself and then decrement the

child's reference count.

If the child node is shared (it has reference count > 1), we won't free

it, so there would be two pointers to each of the grandchildren nodes.

But the reference counts of the grandchildren is not increased, thus the

reference count doesn't match the number of pointers that point to the

grandchildren. This results in "device mapper: space map common: unable

to decrement block" errors.

Fix this bug by incrementing reference counts on the grandchildren if the

btree node is shared.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/09a65adc7d8bbfce06392cb6d375468e2728ead5Refgit.kernel.org/stable/c/12161e03d33afce781f68fa11cc6060538862fadRefgit.kernel.org/stable/c/323d252a4a378834e4fe68298ca61cfc5dd3a460Refgit.kernel.org/stable/c/5ec0debbcfd43596e32c1239e993de06a704e04cRefgit.kernel.org/stable/c/85311a585a26640760cd0f3349ab9f2905691044Refgit.kernel.org/stable/c/b719d12cb94df345e9ad2715fd0abe9afcaeb111Refgit.kernel.org/stable/c/f06f6aededd792a754cd677c02b3d3016d868c2cRefgit.kernel.org/stable/c/f49b41c9eb7c6ff00df27cd49cea210abbadd8ad

How CyberStrike helps

Frequently asked questions

What is CVE-2026-46107?

CVE-2026-46107 is a high-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-46107?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-46107?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-46107?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-46107 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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