dm cache: fix potential out-of-bounds access on the first resume

{
  "id": "32a54babefbbb5f51e0dd13823c29c6298ee8c69aec5613c56709de7235a5dac",
  "url": "https://osv.dev/vulnerability/CVE-2024-50278",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dm cache: fix potential out-of-bounds access on the first resume",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: dm cache: fix potential out-of-bounds access on the first resume Out-of-bounds access occurs if the fast device is expanded unexpectedly before the first-time resume of the cache table. This happens because expanding the fast device requires reloading the cache table for cache_create to allocate new in-core data structures that fit the new size, and the check in cache_preresume is not performed during the first resume, leading to the issue. Reproduce steps: 1. prepare component devices: dmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\" dmsetup create cdata --table \"0 65536 linear /dev/sdc 8192\" dmsetup create corig --table \"0 524288 linear /dev/sdc 262144\" dd if=/dev/zero of=/dev/mapper/cmeta bs=4k count=1 oflag=direct 2. load a cache table of 512 cache blocks, and deliberately expand the fast device before resuming the cache, making the in-core data structures inadequate. dmsetup create cache --notable dmsetup reload cache --table \"0 524288 cache /dev/mapper/cmeta \\ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\" dmsetup reload cdata --table \"0 131072 linear /dev/sdc 8192\" dmsetup resume cdata dmsetup resume cache 3. suspend the cache to write out the in-core dirty bitset and hint array, leading to out-of-bounds access to the dirty bitset at offset 0x40: dmsetup suspend cache KASAN reports: BUG: KASAN: vmalloc-out-of-bounds in is_dirty_callback+0x2b/0x80 Read of size 8 at addr f",
    "evidence": "osv:CVE-2024-50278",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.19.324",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.286",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.230",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.172",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.1.117",
            "evidence": "/affected/1/ranges"
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          {
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            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.11.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-50278",
      "aliases": [
        "CVE-2024-50278"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
        }
      ],
      "affected": [
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              "type": "GIT",
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                {
                  "fixed": "2222b0929d00e2d13732b799b63be391b5de4492"
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                {
                  "fixed": "483b7261b35a9d369082ab298a6670912243f0be"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50278.json"
          }
        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
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                  "introduced": "3.13.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
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      ],
      "modified": "2026-10-28T02:30:41.343656621Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/036dd6e3d2638103e0092864577ea1d091466b86",
        "https://git.kernel.org/stable/c/13ed3624c6ef283acefa4cc42cc8ae54fd4391a4",
        "https://git.kernel.org/stable/c/2222b0929d00e2d13732b799b63be391b5de4492",
        "https://git.kernel.org/stable/c/483b7261b35a9d369082ab298a6670912243f0be",
        "https://git.kernel.org/stable/c/c0ade5d98979585d4f5a93e4514c2e9a65afa08d",
        "https://git.kernel.org/stable/c/c52ec00cb2f9bebfada22edcc0db385b910a1cdb",
        "https://git.kernel.org/stable/c/e492f71854ce03474d49e87fd98b8df1f7cd1d2d",
        "https://git.kernel.org/stable/c/fdef3b94dfebd57e3077a578b6e309a2bb6fa688",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50278.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-50278",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50278.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-50278",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 508797,
  "published_at": "2024-11-19T01:30:19.352+00:00"
}