CVE-2021-47294 (GCVE-0-2021-47294)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2025-05-04 12:41
VLAI?
Title
netrom: Decrease sock refcount when sock timers expire
Summary
In the Linux kernel, the following vulnerability has been resolved: netrom: Decrease sock refcount when sock timers expire Commit 63346650c1a9 ("netrom: switch to sock timer API") switched to use sock timer API. It replaces mod_timer() by sk_reset_timer(), and del_timer() by sk_stop_timer(). Function sk_reset_timer() will increase the refcount of sock if it is called on an inactive timer, hence, in case the timer expires, we need to decrease the refcount ourselves in the handler, otherwise, the sock refcount will be unbalanced and the sock will never be freed.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ce29e8a259de767f7210d346ad2b031cb8ab2732 , < 853262355518cd1247515b74e83fabf038aa6c29 (git)
Affected: baa9e32336bf6d0d74a7c3486d2a27feaf57cd5f , < a01634bf91f2b6c42583770eb6815fb6d1e251cf (git)
Affected: 0adf571fa34b27bd0b97b408cc0f0dc54b72f0eb , < 48866fd5c361ea417ed24b43fc2a7dc2f5b060ef (git)
Affected: 2c6b572458a9127e8070df13fa7f115c29ab1d92 , < 9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950 (git)
Affected: 63346650c1a94a92be61a57416ac88c0a47c4327 , < 25df44e90ff5959b5c24ad361b648504a7e39ef3 (git)
Affected: 63346650c1a94a92be61a57416ac88c0a47c4327 , < 6811744bd0efb9e472cb15d066cdb460beb8cb8a (git)
Affected: 63346650c1a94a92be61a57416ac88c0a47c4327 , < bc1660206c3723c37ed4d622ad81781f1e987250 (git)
Affected: 63346650c1a94a92be61a57416ac88c0a47c4327 , < 517a16b1a88bdb6b530f48d5d153478b2552d9a8 (git)
Affected: f1d9a1f2ef6ff17293d21d5e6b80e04bea0cf508 (git)
Affected: 519e8a22a454b1f1baa3a151b184fe51bc18e178 (git)
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    Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 4.4.277 , ≤ 4.4.* (semver)
Unaffected: 4.9.277 , ≤ 4.9.* (semver)
Unaffected: 4.14.241 , ≤ 4.14.* (semver)
Unaffected: 4.19.199 , ≤ 4.19.* (semver)
Unaffected: 5.4.136 , ≤ 5.4.* (semver)
Unaffected: 5.10.54 , ≤ 5.10.* (semver)
Unaffected: 5.13.6 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
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It replaces mod_timer() by sk_reset_timer(), and\\ndel_timer() by sk_stop_timer().\\n\\nFunction sk_reset_timer() will increase the refcount of sock if it is\\ncalled on an inactive timer, hence, in case the timer expires, we need to\\ndecrease the refcount ourselves in the handler, otherwise, the sock\\nrefcount will be unbalanced and the sock will never be freed.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.277\", \"versionStartIncluding\": \"4.4.173\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.277\", \"versionStartIncluding\": \"4.9.155\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.241\", \"versionStartIncluding\": \"4.14.98\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.199\", \"versionStartIncluding\": \"4.19.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.136\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.54\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13.6\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14\", \"versionStartIncluding\": \"5.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.18.134\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.20.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:41:20.978Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47294\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:41:20.978Z\", \"dateReserved\": \"2024-05-21T13:27:52.130Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:18.034Z\", \"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.