cve-2021-46972
Vulnerability from cvelistv5
Published
2024-02-27 18:47
Modified
2024-12-19 07:32
Severity ?
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 Version: 6815f479ca90ee7fd2e28b2a420f796b974155fe
Version: 6815f479ca90ee7fd2e28b2a420f796b974155fe
Version: 6815f479ca90ee7fd2e28b2a420f796b974155fe
Version: 6815f479ca90ee7fd2e28b2a420f796b974155fe
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   Linux Linux Version: 5.8
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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.\"}],\"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:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.8\",\"versionEndExcluding\":\"5.10.35\",\"matchCriteriaId\":\"460C9D63-8799-4FD7-B512-6CE6409FED25\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.11.19\",\"matchCriteriaId\":\"491D6D53-3D80-40F9-8458-A0B83CCE0F64\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.12\",\"versionEndExcluding\":\"5.12.2\",\"matchCriteriaId\":\"CD9444EF-C1C3-4896-897A-2F3A4C436567\"}]}]}],\"references\":[{\"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\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"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\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:17:42.888Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-46972\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-28T17:00:35.229463Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-28T17:00:39.899Z\"}}], \"cna\": {\"title\": \"ovl: fix leaked dentry\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6815f479ca90ee7fd2e28b2a420f796b974155fe\", \"lessThan\": \"71d58457a8afc650da5d3292a7f7029317654d95\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6815f479ca90ee7fd2e28b2a420f796b974155fe\", \"lessThan\": \"cf3e3330bc5719fa9d658e3e2f596bde89344a94\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6815f479ca90ee7fd2e28b2a420f796b974155fe\", \"lessThan\": \"d587cfaef72b1b6f4b2774827123bce91f497cc8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6815f479ca90ee7fd2e28b2a420f796b974155fe\", \"lessThan\": \"eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/overlayfs/namei.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.8\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.8\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.35\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/overlayfs/namei.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/71d58457a8afc650da5d3292a7f7029317654d95\"}, {\"url\": \"https://git.kernel.org/stable/c/cf3e3330bc5719fa9d658e3e2f596bde89344a94\"}, {\"url\": \"https://git.kernel.org/stable/c/d587cfaef72b1b6f4b2774827123bce91f497cc8\"}, {\"url\": \"https://git.kernel.org/stable/c/eaab1d45cdb4bb0c846bd23c3d666d5b90af7b41\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"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.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:32:49.317Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46972\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T07:32:49.317Z\", \"dateReserved\": \"2024-02-27T18:42:55.943Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T18:47:07.276Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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