fkie_cve-2021-46972
Vulnerability from fkie_nvd
Published
2024-02-27 19:04
Modified
2025-01-08 17:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ovl: fix leaked dentry Since commit 6815f479ca90 ("ovl: use only uppermetacopy state in ovl_lookup()"), overlayfs doesn't put temporary dentry when there is a metacopy error, which leads to dentry leaks when shutting down the related superblock: overlayfs: refusing to follow metacopy origin for (/file0) ... BUG: Dentry (____ptrval____){i=3f33,n=file3} still in use (1) [unmount of overlay overlay] ... WARNING: CPU: 1 PID: 432 at umount_check.cold+0x107/0x14d CPU: 1 PID: 432 Comm: unmount-overlay Not tainted 5.12.0-rc5 #1 ... RIP: 0010:umount_check.cold+0x107/0x14d ... Call Trace: d_walk+0x28c/0x950 ? dentry_lru_isolate+0x2b0/0x2b0 ? __kasan_slab_free+0x12/0x20 do_one_tree+0x33/0x60 shrink_dcache_for_umount+0x78/0x1d0 generic_shutdown_super+0x70/0x440 kill_anon_super+0x3e/0x70 deactivate_locked_super+0xc4/0x160 deactivate_super+0xfa/0x140 cleanup_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 ? reacquire_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 entry_SYSCALL_64_after_hwframe+0x44/0xae ... VFS: Busy inodes after unmount of overlay. Self-destruct in 5 seconds. Have a nice day... This fix has been tested with a syzkaller reproducer.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "460C9D63-8799-4FD7-B512-6CE6409FED25",
              "versionEndExcluding": "5.10.35",
              "versionStartIncluding": "5.8",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "491D6D53-3D80-40F9-8458-A0B83CCE0F64",
              "versionEndExcluding": "5.11.19",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "CD9444EF-C1C3-4896-897A-2F3A4C436567",
              "versionEndExcluding": "5.12.2",
              "versionStartIncluding": "5.12",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "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\u0027t 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."
    }
  ],
  "id": "CVE-2021-46972",
  "lastModified": "2025-01-08T17:30:28.093",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-02-27T19:04:07.403",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-401"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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