CVE-2021-46972

{"id": "CVE-2021-46972", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2024-02-27T19:04:07.403", "references": [{"url": "https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41", "tags": ["Patch"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-401"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\novl: fix leaked dentry\n\nSince commit 6815f479ca90 (\"ovl: use only uppermetacopy state in\novl_lookup()\"), overlayfs doesn't put temporary dentry when there is a\nmetacopy error, which leads to dentry leaks when shutting down the related\nsuperblock:\n\n overlayfs: refusing to follow metacopy origin for (/file0)\n ...\n BUG: Dentry (____ptrval____){i=3f33,n=file3} still in use (1) [unmount of overlay overlay]\n ...\n WARNING: CPU: 1 PID: 432 at umount_check.cold+0x107/0x14d\n CPU: 1 PID: 432 Comm: unmount-overlay Not tainted 5.12.0-rc5 #1\n ...\n RIP: 0010:umount_check.cold+0x107/0x14d\n ...\n Call Trace:\n d_walk+0x28c/0x950\n ? dentry_lru_isolate+0x2b0/0x2b0\n ? __kasan_slab_free+0x12/0x20\n do_one_tree+0x33/0x60\n shrink_dcache_for_umount+0x78/0x1d0\n generic_shutdown_super+0x70/0x440\n kill_anon_super+0x3e/0x70\n deactivate_locked_super+0xc4/0x160\n deactivate_super+0xfa/0x140\n cleanup_mnt+0x22e/0x370\n __cleanup_mnt+0x1a/0x30\n task_work_run+0x139/0x210\n do_exit+0xb0c/0x2820\n ? __kasan_check_read+0x1d/0x30\n ? find_held_lock+0x35/0x160\n ? lock_release+0x1b6/0x660\n ? mm_update_next_owner+0xa20/0xa20\n ? reacquire_held_locks+0x3f0/0x3f0\n ? __sanitizer_cov_trace_const_cmp4+0x22/0x30\n do_group_exit+0x135/0x380\n __do_sys_exit_group.isra.0+0x20/0x20\n __x64_sys_exit_group+0x3c/0x50\n do_syscall_64+0x45/0x70\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n ...\n VFS: Busy inodes after unmount of overlay. Self-destruct in 5 seconds. Have a nice day...\n\nThis fix has been tested with a syzkaller reproducer."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ovl: corrige la dentry filtrada Desde el commit 6815f479ca90 (\"ovl: usa solo el estado de metacopia superior en ovl_lookup()\"), overlayfs no coloca la dentry temporal cuando hay un error de metacopia, lo que conduce a fugas de dentry al cerrar el superbloque relacionado: overlayfs: se niega a seguir el origen de la metacopia para (/file0)... ERROR: Dentry (____ptrval____){i=3f33,n=file3} todav\u00eda est\u00e1 en uso (1) [desmontaje de superposici\u00f3n superpuesta]... ADVERTENCIA: CPU: 1 PID: 432 en umount_check.cold+0x107/0x14d CPU: 1 PID: 432 Comm: unmount-overlay No contaminado 5.12.0-rc5 #1... RIP: 0010:umount_check .cold+0x107/0x14d... Seguimiento de llamadas: d_walk+0x28c/0x950 ? dentry_lru_isolate+0x2b0/0x2b0? __kasan_slab_free+0x12/0x20 do_one_tree+0x33/0x60 encogimiento_dcache_for_umount+0x78/0x1d0 generic_shutdown_super+0x70/0x440 kill_anon_super+0x3e/0x70 deactivate_locked_super+0xc4/0x160 deactivate_super+0xfa/0x140 clean up_mnt+0x22e/0x370 __cleanup_mnt+0x1a/0x30 task_work_run+0x139/0x210 do_exit+0xb0c/0x2820? __kasan_check_read+0x1d/0x30 ? find_held_lock+0x35/0x160? lock_release+0x1b6/0x660? mm_update_next_owner+0xa20/0xa20? \u00bfreaquirir_held_locks+0x3f0/0x3f0? __sanitizer_cov_trace_const_cmp4+0x22/0x30 do_group_exit+0x135/0x380 __do_sys_exit_group.isra.0+0x20/0x20 __x64_sys_exit_group+0x3c/0x50 do_syscall_64+0x45/0x70 entrada_SYSCALL_64 _after_hwframe+0x44/0xae... VFS: Inodos ocupados despu\u00e9s de desmontar la superposici\u00f3n. Autodestrucci\u00f3n en 5 segundos. Que tengas un buen d\u00eda... Esta soluci\u00f3n ha sido probada con un reproductor syzkaller."}], "lastModified": "2025-01-08T17:30:28.093", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "460C9D63-8799-4FD7-B512-6CE6409FED25", "versionEndExcluding": "5.10.35", "versionStartIncluding": "5.8"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "491D6D53-3D80-40F9-8458-A0B83CCE0F64", "versionEndExcluding": "5.11.19", "versionStartIncluding": "5.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "CD9444EF-C1C3-4896-897A-2F3A4C436567", "versionEndExcluding": "5.12.2", "versionStartIncluding": "5.12"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}