CVE-2024-50217 (GCVE-0-2024-50217)

Vulnerability from cvelistv5 – Published: 2024-11-09 10:14 – Updated: 2026-05-11 20:47
VLAI
Title
btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids() Mounting btrfs from two images (which have the same one fsid and two different dev_uuids) in certain executing order may trigger an UAF for variable 'device->bdev_file' in __btrfs_free_extra_devids(). And following are the details: 1. Attach image_1 to loop0, attach image_2 to loop1, and scan btrfs devices by ioctl(BTRFS_IOC_SCAN_DEV): / btrfs_device_1 → loop0 fs_device \ btrfs_device_2 → loop1 2. mount /dev/loop0 /mnt btrfs_open_devices btrfs_device_1->bdev_file = btrfs_get_bdev_and_sb(loop0) btrfs_device_2->bdev_file = btrfs_get_bdev_and_sb(loop1) btrfs_fill_super open_ctree fail: btrfs_close_devices // -ENOMEM btrfs_close_bdev(btrfs_device_1) fput(btrfs_device_1->bdev_file) // btrfs_device_1->bdev_file is freed btrfs_close_bdev(btrfs_device_2) fput(btrfs_device_2->bdev_file) 3. mount /dev/loop1 /mnt btrfs_open_devices btrfs_get_bdev_and_sb(&bdev_file) // EIO, btrfs_device_1->bdev_file is not assigned, // which points to a freed memory area btrfs_device_2->bdev_file = btrfs_get_bdev_and_sb(loop1) btrfs_fill_super open_ctree btrfs_free_extra_devids if (btrfs_device_1->bdev_file) fput(btrfs_device_1->bdev_file) // UAF ! Fix it by setting 'device->bdev_file' as 'NULL' after closing the btrfs_device in btrfs_close_one_device().
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 142388194191a3edc9ba01cfcfd8b691e0971fb2 , < 47a83f8df39545f3f552bb6a1b6d9c30e37621dd (git)
Affected: 142388194191a3edc9ba01cfcfd8b691e0971fb2 , < aec8e6bf839101784f3ef037dcdb9432c3f32343 (git)
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Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 6.11.7 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
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Adjunte image_1 a loop0, adjunte image_2 a loop1 y escanee los dispositivos btrfs con ioctl(BTRFS_IOC_SCAN_DEV): / btrfs_device_1 ? loop0 fs_device \\\\ btrfs_device_2 ? loop1 2. monte /dev/loop0 /mnt btrfs_open_devices btrfs_device_1-\u0026gt;bdev_file = btrfs_get_bdev_and_sb(loop0) btrfs_device_2-\u0026gt;bdev_file = btrfs_get_bdev_and_sb(loop1) btrfs_fill_super open_ctree fail: btrfs_close_devices // -ENOMEM btrfs_close_bdev(btrfs_device_1) fput(btrfs_device_1-\u0026gt;bdev_file) // btrfs_device_1-\u0026gt;bdev_file se libera btrfs_close_bdev(btrfs_device_2) fput(btrfs_device_2-\u0026gt;bdev_file) 3. mount /dev/loop1 /mnt btrfs_open_devices btrfs_get_bdev_and_sb(\u0026amp;bdev_file) // EIO, btrfs_device_1-\u0026gt;bdev_file no est\u00e1 asignado, // lo que apunta a un \u00e1rea de memoria liberada btrfs_device_2-\u0026gt;bdev_file = btrfs_get_bdev_and_sb(loop1) btrfs_fill_super open_ctree btrfs_free_extra_devids if (btrfs_device_1-\u0026gt;bdev_file) fput(btrfs_device_1-\u0026gt;bdev_file) // UAF! 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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"http://www.openwall.com/lists/oss-security/2025/04/10/4\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2025/04/10/5\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2025/04/10/6\"}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2025-04-11T00:11:26.593Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-50217\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-12-11T14:25:44.077787Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-12-11T14:25:45.668Z\"}}], \"cna\": {\"title\": \"btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"142388194191a3edc9ba01cfcfd8b691e0971fb2\", \"lessThan\": \"47a83f8df39545f3f552bb6a1b6d9c30e37621dd\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"142388194191a3edc9ba01cfcfd8b691e0971fb2\", \"lessThan\": \"aec8e6bf839101784f3ef037dcdb9432c3f32343\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/btrfs/volumes.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.11.7\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/btrfs/volumes.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/47a83f8df39545f3f552bb6a1b6d9c30e37621dd\"}, {\"url\": \"https://git.kernel.org/stable/c/aec8e6bf839101784f3ef037dcdb9432c3f32343\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()\\n\\nMounting btrfs from two images (which have the same one fsid and two\\ndifferent dev_uuids) in certain executing order may trigger an UAF for\\nvariable \u0027device-\u003ebdev_file\u0027 in __btrfs_free_extra_devids(). And\\nfollowing are the details:\\n\\n1. Attach image_1 to loop0, attach image_2 to loop1, and scan btrfs\\n   devices by ioctl(BTRFS_IOC_SCAN_DEV):\\n\\n             /  btrfs_device_1 \\u2192 loop0\\n   fs_device\\n             \\\\  btrfs_device_2 \\u2192 loop1\\n2. mount /dev/loop0 /mnt\\n   btrfs_open_devices\\n    btrfs_device_1-\u003ebdev_file = btrfs_get_bdev_and_sb(loop0)\\n    btrfs_device_2-\u003ebdev_file = btrfs_get_bdev_and_sb(loop1)\\n   btrfs_fill_super\\n    open_ctree\\n     fail: btrfs_close_devices // -ENOMEM\\n\\t    btrfs_close_bdev(btrfs_device_1)\\n             fput(btrfs_device_1-\u003ebdev_file)\\n\\t      // btrfs_device_1-\u003ebdev_file is freed\\n\\t    btrfs_close_bdev(btrfs_device_2)\\n             fput(btrfs_device_2-\u003ebdev_file)\\n\\n3. mount /dev/loop1 /mnt\\n   btrfs_open_devices\\n    btrfs_get_bdev_and_sb(\u0026bdev_file)\\n     // EIO, btrfs_device_1-\u003ebdev_file is not assigned,\\n     // which points to a freed memory area\\n    btrfs_device_2-\u003ebdev_file = btrfs_get_bdev_and_sb(loop1)\\n   btrfs_fill_super\\n    open_ctree\\n     btrfs_free_extra_devids\\n      if (btrfs_device_1-\u003ebdev_file)\\n       fput(btrfs_device_1-\u003ebdev_file) // UAF !\\n\\nFix it by setting \u0027device-\u003ebdev_file\u0027 as \u0027NULL\u0027 after closing the\\nbtrfs_device in btrfs_close_one_device().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.7\", \"versionStartIncluding\": \"4.8\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"4.8\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T20:47:41.366Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-50217\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T20:47:41.366Z\", \"dateReserved\": \"2024-10-21T19:36:19.972Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-11-09T10:14:28.798Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.