{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50279",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-50279"
  ],
  "published": "2024-11-19T01:35:04Z",
  "summary": "dm cache: fix out-of-bounds access to the dirty bitset when resizing",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm cache: fix out-of-bounds access to the dirty bitset when resizing\n\ndm-cache checks the dirty bits of the cache blocks to be dropped when\nshrinking the fast device, but an index bug in bitset iteration causes\nout-of-bounds access.\n\nReproduce steps:\n\n1. create a cache device of 1024 cache blocks (128 bytes dirty bitset)\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 524288 linear /dev/sdc 262144\"\ndd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct\ndmsetup create cache --table \"0 524288 cache /dev/mapper/cmeta \\\n/dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\"\n\n2. shrink the fast device to 512 cache blocks, triggering out-of-bounds\n   access to the dirty bitset (offset 0x80)\n\ndmsetup suspend cache\ndmsetup reload cdata --table \"0 65536 linear /dev/sdc 8192\"\ndmsetup resume cdata\ndmsetup resume cache\n\nKASAN reports:\n\n  BUG: KASAN: vmalloc-out-of-bounds in cache_preresume+0x269/0x7b0\n  Read of size 8 at addr ffffc900000f3080 by task dmsetup/131\n\n  (...snip...)\n  The buggy address belongs to the virtual mapping at\n   [ffffc900000f3000, ffffc900000f5000) created by:\n   cache_ctr+0x176a/0x35f0\n\n  (...snip...)\n  Memory state around the buggy address:\n   ffffc900000f2f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n   ffffc900000f3000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  >ffffc900000f3080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n                     ^\n   ffffc900000f3100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n   ffffc900000f3180: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8\n\nFix by making the index post-incremented.",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-50279"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4fa4feb873cea0e9d6ff883b37cca6f33169d8b4"
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  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
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}