CVE-2024-50217

{"id": "CVE-2024-50217", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"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"}, "impactScore": 5.9, "exploitabilityScore": 1.8}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "cvssData": {"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"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2024-11-09T11:15:07.103", "references": [{"url": "https://git.kernel.org/stable/c/47a83f8df39545f3f552bb6a1b6d9c30e37621dd", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/aec8e6bf839101784f3ef037dcdb9432c3f32343", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "http://www.openwall.com/lists/oss-security/2025/04/10/4", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://www.openwall.com/lists/oss-security/2025/04/10/5", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "http://www.openwall.com/lists/oss-security/2025/04/10/6", "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}, {"type": "Secondary", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "description": [{"lang": "en", "value": "CWE-416"}]}], "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 'device->bdev_file' 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->bdev_file = btrfs_get_bdev_and_sb(loop0)\n btrfs_device_2->bdev_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->bdev_file)\n\t // btrfs_device_1->bdev_file is freed\n\t btrfs_close_bdev(btrfs_device_2)\n fput(btrfs_device_2->bdev_file)\n\n3. mount /dev/loop1 /mnt\n btrfs_open_devices\n btrfs_get_bdev_and_sb(&bdev_file)\n // EIO, btrfs_device_1->bdev_file is not assigned,\n // which points to a freed memory area\n btrfs_device_2->bdev_file = btrfs_get_bdev_and_sb(loop1)\n btrfs_fill_super\n open_ctree\n btrfs_free_extra_devids\n if (btrfs_device_1->bdev_file)\n fput(btrfs_device_1->bdev_file) // UAF !\n\nFix it by setting 'device->bdev_file' as 'NULL' 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 'device->bdev_file' 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->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 se libera 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 no est\u00e1 asignado, // lo que apunta a un \u00e1rea de memoria liberada 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! Arr\u00e9glelo configurando 'device->bdev_file' como 'NULL' despu\u00e9s de cerrar btrfs_device en btrfs_close_one_device()."}], "lastModified": "2025-04-11T01:15:52.283", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "92BAD6E0-7814-4F5F-9840-E742D79C4A05", "versionEndExcluding": "6.11.7", "versionStartIncluding": "4.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "7F361E1D-580F-4A2D-A509-7615F73167A1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "925478D0-3E3D-4E6F-ACD5-09F28D5DF82C"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "3C95E234-D335-4B6C-96BF-E2CEBD8654ED"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E0F717D8-3014-4F84-8086-0124B2111379"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "24DBE6C7-2AAE-4818-AED2-E131F153D2FA"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}