CVE-2021-47599

{"id": "CVE-2021-47599", "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 4.7, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.0}]}, "published": "2024-06-19T15:15:54.483", "references": [{"url": "https://git.kernel.org/stable/c/6605fd2f394bba0a0059df2b6cfc87b0b6d393a2", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e342c2558016ead462f376b6c6c2ac5efc17f3b1", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6605fd2f394bba0a0059df2b6cfc87b0b6d393a2", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/e342c2558016ead462f376b6c6c2ac5efc17f3b1", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Modified", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-362"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: use latest_dev in btrfs_show_devname\n\nThe test case btrfs/238 reports the warning below:\n\n WARNING: CPU: 3 PID: 481 at fs/btrfs/super.c:2509 btrfs_show_devname+0x104/0x1e8 [btrfs]\n CPU: 2 PID: 1 Comm: systemd Tainted: G W O 5.14.0-rc1-custom #72\n Hardware name: QEMU QEMU Virtual Machine, BIOS 0.0.0 02/06/2015\n Call trace:\n btrfs_show_devname+0x108/0x1b4 [btrfs]\n show_mountinfo+0x234/0x2c4\n m_show+0x28/0x34\n seq_read_iter+0x12c/0x3c4\n vfs_read+0x29c/0x2c8\n ksys_read+0x80/0xec\n __arm64_sys_read+0x28/0x34\n invoke_syscall+0x50/0xf8\n do_el0_svc+0x88/0x138\n el0_svc+0x2c/0x8c\n el0t_64_sync_handler+0x84/0xe4\n el0t_64_sync+0x198/0x19c\n\nReason:\nWhile btrfs_prepare_sprout() moves the fs_devices::devices into\nfs_devices::seed_list, the btrfs_show_devname() searches for the devices\nand found none, leading to the warning as in above.\n\nFix:\nlatest_dev is updated according to the changes to the device list.\nThat means we could use the latest_dev->name to show the device name in\n/proc/self/mounts, the pointer will be always valid as it's assigned\nbefore the device is deleted from the list in remove or replace.\nThe RCU protection is sufficient as the device structure is freed after\nsynchronization."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: utilice Latest_dev en btrfs_show_devname El caso de prueba btrfs/238 informa la siguiente advertencia: ADVERTENCIA: CPU: 3 PID: 481 en fs/btrfs/super.c:2509 btrfs_show_devname+0x104 /0x1e8 [btrfs] CPU: 2 PID: 1 Comunicaci\u00f3n: systemd Contaminado: GWO 5.14.0-rc1-custom #72 Nombre de hardware: QEMU M\u00e1quina virtual QEMU, BIOS 0.0.0 06/02/2015 Rastreo de llamadas: btrfs_show_devname+0x108/ 0x1b4 [btrfs] show_mountinfo+0x234/0x2c4 m_show+0x28/0x34 seq_read_iter+0x12c/0x3c4 vfs_read+0x29c/0x2c8 ksys_read+0x80/0xec __arm64_sys_read+0x28/0x34 x50/0xf8 do_el0_svc+0x88/0x138 el0_svc+0x2c/0x8c el0t_64_sync_handler +0x84/0xe4 el0t_64_sync+0x198/0x19c Motivo: mientras btrfs_prepare_sprout() mueve fs_devices::devices a fs_devices::seed_list, btrfs_show_devname() busca los dispositivos y no encuentra ninguno, lo que genera la advertencia como se muestra arriba. Soluci\u00f3n: last_dev se actualiza seg\u00fan los cambios en la lista de dispositivos. Eso significa que podr\u00edamos usar el \u00faltimo_dev->name para mostrar el nombre del dispositivo en /proc/self/mounts, el puntero siempre ser\u00e1 v\u00e1lido tal como est\u00e1 asignado antes de que el dispositivo se elimine de la lista en eliminar o reemplazar. La protecci\u00f3n de la RCU es suficiente, ya que la estructura del dispositivo se libera despu\u00e9s de la sincronizaci\u00f3n."}], "lastModified": "2024-11-21T06:36:38.337", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B271E1AF-BC45-4C3E-9614-055846520592", "versionEndExcluding": "5.15.11"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}