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CVE-2024-50279 (GCVE-0-2024-50279)

Vulnerability from cvelistv5 – Published: 2024-11-19 01:30 – Updated: 2026-05-11 20:49
VLAI
Title
dm cache: fix out-of-bounds access to the dirty bitset when resizing
Summary
In the Linux kernel, the following vulnerability has been resolved: dm cache: fix out-of-bounds access to the dirty bitset when resizing dm-cache checks the dirty bits of the cache blocks to be dropped when shrinking the fast device, but an index bug in bitset iteration causes out-of-bounds access. Reproduce steps: 1. create a cache device of 1024 cache blocks (128 bytes dirty bitset) dmsetup create cmeta --table "0 8192 linear /dev/sdc 0" dmsetup create cdata --table "0 131072 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 dmsetup create cache --table "0 524288 cache /dev/mapper/cmeta \ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0" 2. shrink the fast device to 512 cache blocks, triggering out-of-bounds access to the dirty bitset (offset 0x80) dmsetup suspend cache dmsetup reload cdata --table "0 65536 linear /dev/sdc 8192" dmsetup resume cdata dmsetup resume cache KASAN reports: BUG: KASAN: vmalloc-out-of-bounds in cache_preresume+0x269/0x7b0 Read of size 8 at addr ffffc900000f3080 by task dmsetup/131 (...snip...) The buggy address belongs to the virtual mapping at [ffffc900000f3000, ffffc900000f5000) created by: cache_ctr+0x176a/0x35f0 (...snip...) Memory state around the buggy address: ffffc900000f2f80: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc900000f3000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc900000f3080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc900000f3100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc900000f3180: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 Fix by making the index post-incremented.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 20:14 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 , < 4fa4feb873cea0e9d6ff883b37cca6f33169d8b4 (git)
Affected: f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 , < 8501e38dc9e0060814c4085815fc83da3e6d43bf (git)
Affected: f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 , < ee1f74925717ab36f6a091104c170639501ce818 (git)
Affected: f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 , < ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f (git)
Affected: f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 , < 56507203e1b6127967ec2b51fb0b23a0d4af1334 (git)
Affected: f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 , < e57648ce325fa405fe6bbd0e6a618ced7c301a2d (git)
Affected: f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 , < 3b02c40ff10fdf83cc545850db208de855ebe22c (git)
Affected: f494a9c6b1b6dd9a9f21bbb75d9210d478eeb498 , < 792227719725497ce10a8039803bec13f89f8910 (git)
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Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 4.19.324 , ≤ 4.19.* (semver)
Unaffected: 5.4.286 , ≤ 5.4.* (semver)
Unaffected: 5.10.230 , ≤ 5.10.* (semver)
Unaffected: 5.15.172 , ≤ 5.15.* (semver)
Unaffected: 6.1.117 , ≤ 6.1.* (semver)
Unaffected: 6.6.61 , ≤ 6.6.* (semver)
Unaffected: 6.11.8 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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        "descriptions": [
          {
            "lang": "en",
            "value": "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  \u003effffc900000f3080: 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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dm cache: corrige el acceso fuera de los l\u00edmites al conjunto de bits sucio al cambiar el tama\u00f1o dm-cache verifica los bits sucios de los bloques de cach\u00e9 que se deben descartar al reducir el dispositivo r\u00e1pido, pero un error de \u00edndice en la iteraci\u00f3n del conjunto de bits provoca un acceso fuera de los l\u00edmites. Reproducir los pasos: 1. crear un dispositivo de cach\u00e9 de 1024 bloques de cach\u00e9 (128 bytes de bitset sucio) dmsetup create cmeta --table \"0 8192 linear /dev/sdc 0\" dmsetup create cdata --table \"0 131072 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 dmsetup create cache --table \"0 524288 cache /dev/mapper/cmeta \\ /dev/mapper/cdata /dev/mapper/corig 128 2 metadata2 writethrough smq 0\" 2. reducir el dispositivo r\u00e1pido a 512 bloques de cach\u00e9, lo que activa el acceso fuera de los l\u00edmites al bitset sucio. bitset (offset 0x80) dmsetup suspend cache dmsetup reload cdata --table \"0 65536 linear /dev/sdc 8192\" dmsetup resume cdata dmsetup resume cache KASAN informa: ERROR: KASAN: vmalloc-out-of-bounds en cache_preresume+0x269/0x7b0 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffffc900000f3080 por la tarea dmsetup/131 (...snip...) La direcci\u00f3n con errores pertenece al mapeo virtual en [ffffc900000f3000, ffffc900000f5000) creado por: cache_ctr+0x176a/0x35f0 (...snip...) Estado de la memoria alrededor de la direcci\u00f3n con errores: ffffc900000f2f80: f8 f8 f8 f8 f8 f8 ..."
          }
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        "lastModified": "2026-06-17T08:04:05.377",
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            {
              "lang": "en",
              "value": "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  \u003effffc900000f3080: 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."
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2025-05-04T09:50:36.310Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/4fa4feb873cea0e9d6ff883b37cca6f33169d8b4"
            },
            {
              "url": "https://git.kernel.org/stable/c/8501e38dc9e0060814c4085815fc83da3e6d43bf"
            },
            {
              "url": "https://git.kernel.org/stable/c/ee1f74925717ab36f6a091104c170639501ce818"
            },
            {
              "url": "https://git.kernel.org/stable/c/ff1dd8a04c30e8d4e2fd5c83198ca672eb6a9e7f"
            },
            {
              "url": "https://git.kernel.org/stable/c/56507203e1b6127967ec2b51fb0b23a0d4af1334"
            },
            {
              "url": "https://git.kernel.org/stable/c/e57648ce325fa405fe6bbd0e6a618ced7c301a2d"
            },
            {
              "url": "https://git.kernel.org/stable/c/3b02c40ff10fdf83cc545850db208de855ebe22c"
            },
            {
              "url": "https://git.kernel.org/stable/c/792227719725497ce10a8039803bec13f89f8910"
            }
          ],
          "title": "dm cache: fix out-of-bounds access to the dirty bitset when resizing",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-50279",
        "datePublished": "2024-11-19T01:30:20.712Z",
        "dateReserved": "2024-10-21T19:36:19.983Z",
        "dateUpdated": "2025-11-03T22:27:58.416Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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