{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50278",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-50278"
  ],
  "published": "2024-11-19T01:35:04Z",
  "summary": "dm cache: fix potential out-of-bounds access on the first resume",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm cache: fix potential out-of-bounds access on the first resume\n\nOut-of-bounds access occurs if the fast device is expanded unexpectedly\nbefore the first-time resume of the cache table. This happens because\nexpanding the fast device requires reloading the cache table for\ncache_create to allocate new in-core data structures that fit the new\nsize, and the check in cache_preresume is not performed during the\nfirst resume, leading to the issue.\n\nReproduce steps:\n\n1. prepare component devices:\n\ndmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\"\ndmsetup create cdata --table \"0 65536 linear /dev/sdc 8192\"\ndmsetup create corig --table \"0 524288 linear /dev/sdc 262144\"\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct\n\n2. load a cache table of 512 cache blocks, and deliberately expand the\n   fast device before resuming the cache, making the in-core data\n   structures inadequate.\n\ndmsetup create cache --notable\ndmsetup reload cache --table \"0 524288 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\"\ndmsetup reload cdata --table \"0 131072 linear /dev/sdc 8192\"\ndmsetup resume cdata\ndmsetup resume cache\n\n3. suspend the cache to write out the in-core dirty bitset and hint\n   array, leading to out-of-bounds access to the dirty bitset at offset\n   0x40:\n\ndmsetup suspend cache\n\nKASAN reports:\n\n  BUG: KASAN: vmalloc-out-of-bounds in is_dirty_callback+0x2b/0x80\n  Read of size 8 at addr ffffc90000085040 by task dmsetup/90\n\n  (...snip...)\n  The buggy address belongs to the virtual mapping at\n   [ffffc90000085000, ffffc90000087000) created by:\n   cache_ctr+0x176a/0x35f0\n\n  (...snip...)\n  Memory state around the buggy address:\n   ffffc90000084f00: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n   ffffc90000084f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n  >ffffc90000085000: 00 00 00 00 00 00 00 00 f8 f8 f8 f8 f8 f8 f8 f8\n                                             ^\n   ffffc90000085080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n   ffffc90000085100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n\nFix by checking the size change on the first resume.",
  "affected": [
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        "name": "linux"
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-50278"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e492f71854ce03474d49e87fd98b8df1f7cd1d2d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/2222b0929d00e2d13732b799b63be391b5de4492"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/483b7261b35a9d369082ab298a6670912243f0be"
    },
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      "url": "https://git.kernel.org/stable/c/fdef3b94dfebd57e3077a578b6e309a2bb6fa688"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c52ec00cb2f9bebfada22edcc0db385b910a1cdb"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/036dd6e3d2638103e0092864577ea1d091466b86"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/13ed3624c6ef283acefa4cc42cc8ae54fd4391a4"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c0ade5d98979585d4f5a93e4514c2e9a65afa08d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
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}