CVE-2021-47507 - OpenCVE

In the Linux kernel, the following vulnerability has been resolved: nfsd: Fix nsfd startup race (again) Commit bd5ae9288d64 ("nfsd: register pernet ops last, unregister first") has re-opened rpc_pipefs_event() race against nfsd_net_id registration (register_pernet_subsys()) which has been fixed by commit bb7ffbf29e76 ("nfsd: fix nsfd startup race triggering BUG_ON"). Restore the order of register_pernet_subsys() vs register_cld_notifier(). Add WARN_ON() to prevent a future regression. Crash info: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000012 CPU: 8 PID: 345 Comm: mount Not tainted 5.4.144-... #1 pc : rpc_pipefs_event+0x54/0x120 [nfsd] lr : rpc_pipefs_event+0x48/0x120 [nfsd] Call trace: rpc_pipefs_event+0x54/0x120 [nfsd] blocking_notifier_call_chain rpc_fill_super get_tree_keyed rpc_fs_get_tree vfs_get_tree do_mount ksys_mount __arm64_sys_mount el0_svc_handler el0_svc

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

No data.

No data.

No data.

References

Link	Providers
https://git.kernel.org/stable/c/8bf902fee5893cfc2f04a698abab47629699ae9a
https://git.kernel.org/stable/c/b10252c7ae9c9d7c90552f88b544a44ee773af64
https://git.kernel.org/stable/c/c520943a00ad5015704969ad3304c956bcd49d25
https://git.kernel.org/stable/c/f5734b1714ca355703e9ea8fb61d04beff1790b9
https://lore.kernel.org/linux-cve-announce/2024052452-CVE-2021-47507-e722@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2021-47507
https://www.cve.org/CVERecord?id=CVE-2021-47507

History

Wed, 11 Sep 2024 13:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-05-24T15:01:53.401Z

Updated: 2024-09-11T17:32:52.727Z

Reserved: 2024-05-22T06:20:56.206Z

Link: CVE-2021-47507

Vulnrichment

Updated: 2024-09-11T12:42:13.203Z

NVD

Status : Awaiting Analysis

Published: 2024-05-24T15:15:11.400

Modified: 2024-05-24T18:09:20.027

Link: CVE-2021-47507

Redhat

Severity : Moderate

Publid Date: 2024-05-24T00:00:00Z

Links: CVE-2021-47507 - Bugzilla

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{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: Fix nsfd startup race (again)\n\nCommit bd5ae9288d64 (\"nfsd: register pernet ops last, unregister first\")\nhas re-opened rpc_pipefs_event() race against nfsd_net_id registration\n(register_pernet_subsys()) which has been fixed by commit bb7ffbf29e76\n(\"nfsd: fix nsfd startup race triggering BUG_ON\").\n\nRestore the order of register_pernet_subsys() vs register_cld_notifier().\nAdd WARN_ON() to prevent a future regression.\n\nCrash info:\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000012\nCPU: 8 PID: 345 Comm: mount Not tainted 5.4.144-... #1\npc : rpc_pipefs_event+0x54/0x120 [nfsd]\nlr : rpc_pipefs_event+0x48/0x120 [nfsd]\nCall trace:\n rpc_pipefs_event+0x54/0x120 [nfsd]\n blocking_notifier_call_chain\n rpc_fill_super\n get_tree_keyed\n rpc_fs_get_tree\n vfs_get_tree\n do_mount\n ksys_mount\n __arm64_sys_mount\n el0_svc_handler\n el0_svc"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfsd: corrige la ejecuci\u00f3n de inicio de nsfd (nuevamente) El commit bd5ae9288d64 (\"nfsd: registre las operaciones de pernet al final, anule el registro primero\") ha reabierto la ejecuci\u00f3n de rpc_pipefs_event() contra el registro de nfsd_net_id (register_pernet_subsys( )) que se ha solucionado mediante el commit bb7ffbf29e76 (\"nfsd: arreglar la ejecuci\u00f3n de inicio de nsfd que activa BUG_ON\"). Restaure el orden de Register_pernet_subsys() frente a Register_cld_notifier(). Agregue WARN_ON() para evitar una regresi\u00f3n futura. Informaci\u00f3n de falla: no se puede manejar la desreferencia del puntero NULL del kernel en la direcci\u00f3n virtual 0000000000000012 CPU: 8 PID: 345 Comm: mount Not tainted 5.4.144-... #1 pc: rpc_pipefs_event+0x54/0x120 [nfsd] lr: rpc_pipefs_event+0x48/ 0x120 [nfsd] Rastreo de llamadas: rpc_pipefs_event+0x54/0x120 [nfsd] blocking_notifier_call_chain rpc_fill_super get_tree_keyed rpc_fs_get_tree vfs_get_tree do_mount ksys_mount __arm64_sys_mount el0_svc_handler el0_svc"}], "id": "CVE-2021-47507", "lastModified": "2024-05-24T18:09:20.027", "metrics": {}, "published": "2024-05-24T15:15:11.400", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8bf902fee5893cfc2f04a698abab47629699ae9a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b10252c7ae9c9d7c90552f88b544a44ee773af64"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c520943a00ad5015704969ad3304c956bcd49d25"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f5734b1714ca355703e9ea8fb61d04beff1790b9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: nfsd: Fix nsfd startup race (again)", "id": "2283445", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2283445"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-362->CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnfsd: Fix nsfd startup race (again)\nCommit bd5ae9288d64 (\"nfsd: register pernet ops last, unregister first\")\nhas re-opened rpc_pipefs_event() race against nfsd_net_id registration\n(register_pernet_subsys()) which has been fixed by commit bb7ffbf29e76\n(\"nfsd: fix nsfd startup race triggering BUG_ON\").\nRestore the order of register_pernet_subsys() vs register_cld_notifier().\nAdd WARN_ON() to prevent a future regression.\nCrash info:\nUnable to handle kernel NULL pointer dereference at virtual address 0000000000000012\nCPU: 8 PID: 345 Comm: mount Not tainted 5.4.144-... #1\npc : rpc_pipefs_event+0x54/0x120 [nfsd]\nlr : rpc_pipefs_event+0x48/0x120 [nfsd]\nCall trace:\nrpc_pipefs_event+0x54/0x120 [nfsd]\nblocking_notifier_call_chain\nrpc_fill_super\nget_tree_keyed\nrpc_fs_get_tree\nvfs_get_tree\ndo_mount\nksys_mount\n__arm64_sys_mount\nel0_svc_handler\nel0_svc"], "name": "CVE-2021-47507", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47507\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47507\nhttps://lore.kernel.org/linux-cve-announce/2024052452-CVE-2021-47507-e722@gregkh/T"], "threat_severity": "Moderate", "upstream_fix": "kernel 5.4.165, kernel 5.10.85, kernel 5.15.8, kernel 5.16"}