cve-2024-50217
Vulnerability from cvelistv5
Published
2024-11-09 10:14
Modified
2024-12-19 09:35
Severity ?
EPSS score ?
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().
References
Impacted products
{ "containers": { "adp": [ { "metrics": [ { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" } }, { "other": { "content": { "id": "CVE-2024-50217", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "timestamp": "2024-12-11T14:25:44.077787Z", "version": "2.0.3" }, "type": "ssvc" } } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-416", "description": "CWE-416 Use After Free", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "dateUpdated": "2024-12-11T14:58:32.841Z", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP" }, "title": "CISA ADP Vulnrichment" } ], "cna": { "affected": [ { "defaultStatus": "unaffected", "product": "Linux", "programFiles": [ "fs/btrfs/volumes.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "lessThan": "47a83f8df39545f3f552bb6a1b6d9c30e37621dd", "status": "affected", "version": "142388194191a3edc9ba01cfcfd8b691e0971fb2", "versionType": "git" }, { "lessThan": "aec8e6bf839101784f3ef037dcdb9432c3f32343", "status": "affected", "version": "142388194191a3edc9ba01cfcfd8b691e0971fb2", "versionType": "git" } ] }, { "defaultStatus": "affected", "product": "Linux", "programFiles": [ "fs/btrfs/volumes.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "status": "affected", "version": "4.8" }, { "lessThan": "4.8", "status": "unaffected", "version": "0", "versionType": "semver" }, { "lessThanOrEqual": "6.11.*", "status": "unaffected", "version": "6.11.7", "versionType": "semver" }, { "lessThanOrEqual": "*", "status": "unaffected", "version": "6.12", "versionType": "original_commit_for_fix" } ] } ], "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()." } ], "providerMetadata": { "dateUpdated": "2024-12-19T09:35:38.995Z", "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux" }, "references": [ { "url": "https://git.kernel.org/stable/c/47a83f8df39545f3f552bb6a1b6d9c30e37621dd" }, { "url": "https://git.kernel.org/stable/c/aec8e6bf839101784f3ef037dcdb9432c3f32343" } ], "title": "btrfs: fix use-after-free of block device file in __btrfs_free_extra_devids()", "x_generator": { "engine": "bippy-5f407fcff5a0" } } }, "cveMetadata": { "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "assignerShortName": "Linux", "cveId": "CVE-2024-50217", "datePublished": "2024-11-09T10:14:28.798Z", "dateReserved": "2024-10-21T19:36:19.972Z", "dateUpdated": "2024-12-19T09:35:38.995Z", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.1", "meta": { "nvd": "{\"cve\":{\"id\":\"CVE-2024-50217\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-11-09T11:15:07.103\",\"lastModified\":\"2024-12-11T15:15:13.550\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: se corrige el use-after-free del archivo del dispositivo de bloque en __btrfs_free_extra_devids(). Montar btrfs desde dos im\u00e1genes (que tienen el mismo fsid y dos dev_uuids diferentes) en cierto orden de ejecuci\u00f3n puede activar un UAF para la variable \u0027device-\u0026gt;bdev_file\u0027 en __btrfs_free_extra_devids(). Y a continuaci\u00f3n se muestran los detalles: 1. 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! Arr\u00e9glelo configurando \u0027device-\u0026gt;bdev_file\u0027 como \u0027NULL\u0027 despu\u00e9s de cerrar btrfs_device en btrfs_close_one_device().\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.8\",\"versionEndExcluding\":\"6.11.7\",\"matchCriteriaId\":\"92BAD6E0-7814-4F5F-9840-E742D79C4A05\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F361E1D-580F-4A2D-A509-7615F73167A1\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"925478D0-3E3D-4E6F-ACD5-09F28D5DF82C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"3C95E234-D335-4B6C-96BF-E2CEBD8654ED\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"E0F717D8-3014-4F84-8086-0124B2111379\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"24DBE6C7-2AAE-4818-AED2-E131F153D2FA\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/47a83f8df39545f3f552bb6a1b6d9c30e37621dd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/aec8e6bf839101784f3ef037dcdb9432c3f32343\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}" } }
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Sightings
Author | Source | Type | Date |
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.