CVE-2021-47506 (GCVE-0-2021-47506)

Vulnerability from cvelistv5 – Published: 2024-05-24 15:01 – Updated: 2025-05-21 08:31
VLAI?
Title
nfsd: fix use-after-free due to delegation race
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: fix use-after-free due to delegation race A delegation break could arrive as soon as we've called vfs_setlease. A delegation break runs a callback which immediately (in nfsd4_cb_recall_prepare) adds the delegation to del_recall_lru. If we then exit nfs4_set_delegation without hashing the delegation, it will be freed as soon as the callback is done with it, without ever being removed from del_recall_lru. Symptoms show up later as use-after-free or list corruption warnings, usually in the laundromat thread. I suspect aba2072f4523 "nfsd: grant read delegations to clients holding writes" made this bug easier to hit, but I looked as far back as v3.0 and it looks to me it already had the same problem. So I'm not sure where the bug was introduced; it may have been there from the beginning.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: dff1399f8addf7129c49bb2227469da79cc30b47 , < 04a8d07f3d58308b92630045560799a3faa3ebce (git)
Affected: dff1399f8addf7129c49bb2227469da79cc30b47 , < 348714018139c39533c55661a0c7c990671396b4 (git)
Affected: dff1399f8addf7129c49bb2227469da79cc30b47 , < 33645d3e22720cac1e4548f8fef57bf0649536ee (git)
Affected: dff1399f8addf7129c49bb2227469da79cc30b47 , < 2becaa990b93cbd2928292c0b669d3abb6cf06d4 (git)
Affected: dff1399f8addf7129c49bb2227469da79cc30b47 , < e0759696de6851d7536efddfdd2dfed4c4df1f09 (git)
Affected: dff1399f8addf7129c49bb2227469da79cc30b47 , < eeb0711801f5e19ef654371b627682aed3b11373 (git)
Affected: dff1399f8addf7129c49bb2227469da79cc30b47 , < 148c816f10fd11df27ca6a9b3238cdd42fa72cd3 (git)
Affected: dff1399f8addf7129c49bb2227469da79cc30b47 , < 548ec0805c399c65ed66c6641be467f717833ab5 (git)
Create a notification for this product.
    Linux Linux Affected: 3.17
Unaffected: 0 , < 3.17 (semver)
Unaffected: 4.4.296 , ≤ 4.4.* (semver)
Unaffected: 4.9.294 , ≤ 4.9.* (semver)
Unaffected: 4.14.259 , ≤ 4.14.* (semver)
Unaffected: 4.19.222 , ≤ 4.19.* (semver)
Unaffected: 5.4.168 , ≤ 5.4.* (semver)
Unaffected: 5.10.85 , ≤ 5.10.* (semver)
Unaffected: 5.15.8 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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A\\ndelegation break runs a callback which immediately (in\\nnfsd4_cb_recall_prepare) adds the delegation to del_recall_lru.  If we\\nthen exit nfs4_set_delegation without hashing the delegation, it will be\\nfreed as soon as the callback is done with it, without ever being\\nremoved from del_recall_lru.\\n\\nSymptoms show up later as use-after-free or list corruption warnings,\\nusually in the laundromat thread.\\n\\nI suspect aba2072f4523 \\\"nfsd: grant read delegations to clients holding\\nwrites\\\" made this bug easier to hit, but I looked as far back as v3.0\\nand it looks to me it already had the same problem.  So I\u0027m not sure\\nwhere the bug was introduced; it may have been there from the beginning.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.296\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.294\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.259\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.222\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.168\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.85\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.8\", \"versionStartIncluding\": \"3.17\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"3.17\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-21T08:31:49.596Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47506\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-21T08:31:49.596Z\", \"dateReserved\": \"2024-05-22T06:20:56.205Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-24T15:01:52.746Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

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.