{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53060",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-53060"
  ],
  "published": "2026-06-24T16:31:02Z",
  "summary": "dm cache metadata: fix memory leak on metadata abort retry",
  "details": "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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