CVE-2026-53061
Estado: AnalizadaMedia (5.5)—
In 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.
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Reproduce steps:
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
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.
Detalles técnicos trazas, registros y código del informe original
1. Create a writeback cache with zero migration_threshold to produce dirty mappings 4. Resume the inactive table. Now it's possible to load the dirty block into passthrough mode.
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.12%
- Percentil entre todas las CVEs puntuadas: 2
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/01b22656d8a68dbeae59f8b80866e7b11936b20a
- https://git.kernel.org/stable/c/12105c7f18375d7615dad7605d89eadae7eb12a6
- https://git.kernel.org/stable/c/1443c32f24d6d8bcdf4beceef2afc09290b98717
- https://git.kernel.org/stable/c/21c503d60a257e54ca3ac58e2721bd24501d5bde
- https://git.kernel.org/stable/c/322586745bd1a0e5f3559fd1635fdeb4dbd1d6b8
- https://git.kernel.org/stable/c/5c98a3f1d7a554c9e920aa31daf92af6b5bbb8cc
- https://git.kernel.org/stable/c/bd5a2c1018938e6b32670728bdb32a3f0efff00f
- https://git.kernel.org/stable/c/c2e86f647561fcf5e1c6eba7d75e9e0c4299c94d
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm cache: fix dirty mapping checking in passthrough mode switching\n\nAs mentioned in commit 9b1cc9f251af (\"dm cache: share cache-metadata\nobject across inactive and active DM tables\"), dm-cache assumed table\nreload occurs after suspension, while LVM's table preload breaks this\nassumption. The dirty mapping check for passthrough mode was designed\naround this assumption and is performed during table creation, causing\nthe check to fail with preload while metadata updates are ongoing. This\nrisks loading dirty mappings into passthrough mode, resulting in data\nloss.\n\nReproduce steps:\n\n1. Create a writeback cache with zero migration_threshold to produce\n dirty mappings\n\ndmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\"\ndmsetup create cdata --table \"0 131072 linear /dev/sdc 8192\"\ndmsetup create corig --table \"0 262144 linear /dev/sdc 262144\"\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct\ndmsetup create cache --table \"0 262144 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writeback smq \\\n2 migration_threshold 0\"\n\n2. Preload a table in passthrough mode\n\ndmsetup reload cache --table \"0 262144 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 passthrough smq 0\"\n\n3. Write to the first cache block to make it dirty\n\nfio --filename=/dev/mapper/cache --name=populate --rw=write --bs=4k \\\n--direct=1 --size=64k\n\n4. Resume the inactive table. Now it's possible to load the dirty block\n into passthrough mode.\n\ndmsetup resume cache\n\nFix by moving the checks to the preresume phase to support table\npreloading. Also remove the unused function dm_cache_metadata_all_clean."
}
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"lastModified": "2026-07-21T17:36:06.157",
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