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CVE-2021-47507 (GCVE-0-2021-47507)

Vulnerability from cvelistv5 – Published: 2024-05-24 15:01 – Updated: 2026-05-23 15:20
VLAI
Title
nfsd: Fix nsfd startup race (again)
Summary
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
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:35 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8677e99150b0830d29cc1318b4cc559e176940bb , < f5734b1714ca355703e9ea8fb61d04beff1790b9 (git)
Affected: 7c7cb07d4affcf41749234fe9dc4d90cd3959e32 , < c520943a00ad5015704969ad3304c956bcd49d25 (git)
Affected: bd5ae9288d6451bd346a1b4a59d4fe7e62ba29b7 , < 8bf902fee5893cfc2f04a698abab47629699ae9a (git)
Affected: bd5ae9288d6451bd346a1b4a59d4fe7e62ba29b7 , < b10252c7ae9c9d7c90552f88b544a44ee773af64 (git)
Affected: 4d41f65efeec0a6da6088341203c81e49ebfcd90 (git)
Affected: 5.4.102 , < 5.4.165 (semver)
Affected: 5.10.20 , < 5.10.85 (semver)
Affected: 5.11.3 , < 5.12 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.4.165 , ≤ 5.4.* (semver)
Unaffected: 5.10.85 , ≤ 5.10.* (semver)
Unaffected: 5.15.8 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "redhat_vex": {
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      "current_release_date": "2026-02-02T10:48:52+00:00",
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      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "90",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nfsd: Fix nsfd startup race (again)",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47507.json",
      "version": "3"
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      "current_release_date": "2026-09-13T23:55:33Z",
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      "product_status:known_not_affected": "195",
      "product_status:recommended": "543",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47507",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47507.json",
      "version": "63"
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  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.