CVE-2026-53060
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
dm cache metadata: fix memory leak on metadata abort retry
When failing to acquire the root_lock in dm_cache_metadata_abort because the block_manager is read-only, the temporary block_manager created outside the root_lock is not properly released, causing a memory leak.
Reproduce steps:
This can be reproduced by reloading a new table while the metadata is read-only. While the second call to dm_cache_metadata_abort is caused by lack of support for table preload in dm-cache, mentioned in commit 9b1cc9f251af ("dm cache: share cache-metadata object across inactive and active DM tables"), it exposes the memory leak in dm_cache_metadata_abort when the function is called multiple times. Specifically, dm-cache fails to sync the new cache object's mode during preresume, creating the reproducer condition.
Leer descripción completaMostrar menos
This issue could also occur through concurrent metadata_operation_failed calls due to races in cache mode updates, but the table preload scenario below provides a reliable reproducer.
1. Create a cache device with some faulty trailing metadata blocks
dmsetup create cmeta <<EOF 0 200 linear /dev/sdc 0 200 7992 error EOF 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 131072 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 1 writethrough smq 0"
dmsetup suspend cache dmsetup resume cache
3. Write to the cache device to update metadata
fio --filename=/dev/mapper/cache --name test --rw=randwrite --bs=4k \ --randrepeat=0 --direct=1 --size 64k
4. Preload the same table
dmsetup reload cache --table "$(dmsetup table cache)"
5. Resume the new table. This triggers the memory leak.
dmsetup suspend cache dmsetup resume cache
kmemleak logs:
Detalles técnicos trazas, registros y código del informe original
2. Suspend and resume the cache to start a new metadata transaction and
trigger metadata io errors on the next metadata commit.
<snip>
unreferenced object 0xffff8880080c2010 (size 16):
comm "dmsetup", pid 132, jiffies 4294982580
hex dump (first 16 bytes):
00 38 b9 07 80 88 ff ff 6a 6b 6b 6b 6b 6b 6b a5 ...
backtrace (crc 3118f31c):
kmemleak_alloc+0x28/0x40
__kmalloc_cache_noprof+0x3d9/0x510
dm_block_manager_create+0x51/0x140
dm_cache_metadata_abort+0x85/0x320
metadata_operation_failed+0x103/0x1e0
cache_preresume+0xacd/0xe70
dm_table_resume_targets+0xd3/0x320
__dm_resume+0x1b/0xf0
dm_resume+0x127/0x170
<snip>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: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- 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
- CWE-401
Referencias
- https://git.kernel.org/stable/c/044ca491d4086dc5bf233e9fcb71db52df32f633
- https://git.kernel.org/stable/c/14f60e957f34f95a626caec76a8fae88cf4c397f
- https://git.kernel.org/stable/c/15c30997dca681f90dbf2d45ee629c1828bf0c0d
- https://git.kernel.org/stable/c/322a3b70368d49e39591fe9fc6c07d262128b05f
- https://git.kernel.org/stable/c/4311ca59a1891d33c4c8b7946f98c34f167fe833
- https://git.kernel.org/stable/c/6b97cc7a42905755c56bbddc33aa8b792205caee
- https://git.kernel.org/stable/c/b0bd35535bdb6f58505f3a30ee5793986943997a
- https://git.kernel.org/stable/c/d1a79620c419a0af1911f99c873014b30740e303
JSON original (NVD)
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm cache metadata: fix memory leak on metadata abort retry\n\nWhen failing to acquire the root_lock in dm_cache_metadata_abort because\nthe block_manager is read-only, the temporary block_manager created\noutside the root_lock is not properly released, causing a memory leak.\n\nReproduce steps:\n\nThis can be reproduced by reloading a new table while the metadata\nis read-only. While the second call to dm_cache_metadata_abort is\ncaused by lack of support for table preload in dm-cache, mentioned\nin commit 9b1cc9f251af (\"dm cache: share cache-metadata object across\ninactive and active DM tables\"), it exposes the memory leak in\ndm_cache_metadata_abort when the function is called multiple times.\nSpecifically, dm-cache fails to sync the new cache object's mode during\npreresume, creating the reproducer condition.\n\nThis issue could also occur through concurrent metadata_operation_failed\ncalls due to races in cache mode updates, but the table preload scenario\nbelow provides a reliable reproducer.\n\n1. Create a cache device with some faulty trailing metadata blocks\n\ndmsetup create cmeta <<EOF\n0 200 linear /dev/sdc 0\n200 7992 error\nEOF\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 131072 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 1 writethrough smq 0\"\n\n2. Suspend and resume the cache to start a new metadata transaction and\n trigger metadata io errors on the next metadata commit.\n\ndmsetup suspend cache\ndmsetup resume cache\n\n3. Write to the cache device to update metadata\n\nfio --filename=/dev/mapper/cache --name test --rw=randwrite --bs=4k \\\n--randrepeat=0 --direct=1 --size 64k\n\n4. Preload the same table\n\ndmsetup reload cache --table \"$(dmsetup table cache)\"\n\n5. Resume the new table. This triggers the memory leak.\n\ndmsetup suspend cache\ndmsetup resume cache\n\nkmemleak logs:\n\n<snip>\nunreferenced object 0xffff8880080c2010 (size 16):\n comm \"dmsetup\", pid 132, jiffies 4294982580\n hex dump (first 16 bytes):\n 00 38 b9 07 80 88 ff ff 6a 6b 6b 6b 6b 6b 6b a5 ...\n backtrace (crc 3118f31c):\n kmemleak_alloc+0x28/0x40\n __kmalloc_cache_noprof+0x3d9/0x510\n dm_block_manager_create+0x51/0x140\n dm_cache_metadata_abort+0x85/0x320\n metadata_operation_failed+0x103/0x1e0\n cache_preresume+0xacd/0xe70\n dm_table_resume_targets+0xd3/0x320\n __dm_resume+0x1b/0xf0\n dm_resume+0x127/0x170\n<snip>"
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"lastModified": "2026-07-21T17:35:54.607",
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