dm cache: fix dirty mapping checking in passthrough mode switching

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Summary

CVECVE-2026-53061
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:18 UTC
Updated2026-06-24 17:17:18 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: dm cache: fix dirty mapping checking in passthrough mode switching As mentioned in commit 9b1cc9f251af ("dm cache: share cache-metadata object across inactive and active DM tables"), dm-cache assumed table reload occurs after suspension, while LVM's table preload breaks this assumption. The dirty mapping check for passthrough mode was designed around this assumption and is performed during table creation, causing the check to fail with preload while metadata updates are ongoing. This risks loading dirty mappings into passthrough mode, resulting in data loss. Reproduce steps: 1. Create a writeback cache with zero migration_threshold to produce dirty mappings dmsetup create cmeta --table "0 8192 linear /dev/sdc 0" dmsetup create cdata --table "0 131072 linear /dev/sdc 8192" dmsetup create corig --table "0 262144 linear /dev/sdc 262144" dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct dmsetup create cache --table "0 262144 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writeback smq \ 2 migration_threshold 0" 2. Preload a table in passthrough mode dmsetup reload cache --table "0 262144 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0" 3. Write to the first cache block to make it dirty fio --filename=/dev/mapper/cache --name=populate --rw=write --bs=4k \ --direct=1 --size=64k 4. Resume the inactive table. Now it's possible to load the dirty block into passthrough mode. dmsetup resume cache Fix by moving the checks to the preresume phase to support table preloading. Also remove the unused function dm_cache_metadata_all_clean.

Risk And Classification

EPSS: 0.001760000 probability, percentile 0.073600000 (date 2026-06-25)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 2ee57d587357f0d752af6c2e3e46434a74b1bee3 c2e86f647561fcf5e1c6eba7d75e9e0c4299c94d git Not specified
CNA Linux Linux affected 2ee57d587357f0d752af6c2e3e46434a74b1bee3 5c98a3f1d7a554c9e920aa31daf92af6b5bbb8cc git Not specified
CNA Linux Linux affected 2ee57d587357f0d752af6c2e3e46434a74b1bee3 1443c32f24d6d8bcdf4beceef2afc09290b98717 git Not specified
CNA Linux Linux affected 2ee57d587357f0d752af6c2e3e46434a74b1bee3 12105c7f18375d7615dad7605d89eadae7eb12a6 git Not specified
CNA Linux Linux affected 2ee57d587357f0d752af6c2e3e46434a74b1bee3 bd5a2c1018938e6b32670728bdb32a3f0efff00f git Not specified
CNA Linux Linux affected 2ee57d587357f0d752af6c2e3e46434a74b1bee3 21c503d60a257e54ca3ac58e2721bd24501d5bde git Not specified
CNA Linux Linux affected 2ee57d587357f0d752af6c2e3e46434a74b1bee3 01b22656d8a68dbeae59f8b80866e7b11936b20a git Not specified
CNA Linux Linux affected 2ee57d587357f0d752af6c2e3e46434a74b1bee3 322586745bd1a0e5f3559fd1635fdeb4dbd1d6b8 git Not specified
CNA Linux Linux affected 3.13 Not specified
CNA Linux Linux unaffected 3.13 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/5c98a3f1d7a554c9e920aa31daf92af6b5bbb8cc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1443c32f24d6d8bcdf4beceef2afc09290b98717 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/01b22656d8a68dbeae59f8b80866e7b11936b20a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd5a2c1018938e6b32670728bdb32a3f0efff00f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/21c503d60a257e54ca3ac58e2721bd24501d5bde 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/322586745bd1a0e5f3559fd1635fdeb4dbd1d6b8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/12105c7f18375d7615dad7605d89eadae7eb12a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c2e86f647561fcf5e1c6eba7d75e9e0c4299c94d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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