CVE-2026-72108

Technical Description

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

dm thin metadata: fix metadata snapshot consistency on commit failure

__reserve_metadata_snap() and __release_metadata_snap() modify the

superblock's held_root directly in the block_manager's buffer. If the

subsequent metadata commit fails, the held_root gets flushed to disk

through the abort_transaction path, resulting in inconsistent metadata.

Reproducer 1: __reserve_metadata_snap()

1. Create a 2 MiB metadata device and make the region after the 14th

block inaccessible, to trigger metadata commit failure in the

subsequent reserve_metadata_snap operation. The 14th block will be

the shadow destination for the index block.

dmsetup create tmeta --table "0 112 linear /dev/sdc 0

112 3984 error"

2. Create a 16 MiB thin-pool

dmsetup create tdata --table "0 32768 zero"

dd if=/dev/zero of=/dev/mapper/tmeta bs=4k count=1

dmsetup create tpool --table "0 32768 thin-pool /dev/mapper/tmeta \

/dev/mapper/tdata 128 0

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