CVE-2021-47328 (GCVE-0-2021-47328)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-08-05 08:47
VLAI
Title
scsi: iscsi: Fix conn use after free during resets
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: iscsi: Fix conn use after free during resets If we haven't done a unbind target call we can race where iscsi_conn_teardown wakes up the EH thread and then frees the conn while those threads are still accessing the conn ehwait. We can only do one TMF per session so this just moves the TMF fields from the conn to the session. We can then rely on the iscsi_session_teardown->iscsi_remove_session->__iscsi_unbind_session call to remove the target and it's devices, and know after that point there is no device or scsi-ml callout trying to access the session.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 660d0831d1494a6837b2f810d08b5be092c1f31d , < bf20d85a88384574fabb3d53ad62a8af57e7ab11 (git)
Affected: 660d0831d1494a6837b2f810d08b5be092c1f31d , < d04958a348e560938410e04a12fb99da9c7e6a00 (git)
Affected: 660d0831d1494a6837b2f810d08b5be092c1f31d , < 89812e7957ab0746eab66ed6fc49d52bb4dca250 (git)
Affected: 660d0831d1494a6837b2f810d08b5be092c1f31d , < f0a031f7c55ffd944fead1ddaf2aa94df9a158c1 (git)
Affected: 660d0831d1494a6837b2f810d08b5be092c1f31d , < fa9542b35ceb4202e8f8d65f440529a63524dca9 (git)
Affected: 660d0831d1494a6837b2f810d08b5be092c1f31d , < ec29d0ac29be366450a7faffbcf8cba3a6a3b506 (git)
Affected: 861a9633c22ee8b484e1b4054995f7e1b94a3834 (git)
Affected: 0adcec66bce9b7e84847da09ae3f8bc36e753312 (git)
Affected: 20b38ab5b687df3dbb873cfb0efa946a021f890a (git)
Affected: 71b6a23ea944c6a30958bd15a69211e1fd521e1e (git)
Affected: 3.2.72 , < 3.3 (semver)
Affected: 3.4.111 , < 3.5 (semver)
Affected: 3.18.22 , < 3.19 (semver)
Affected: 4.1.7 , < 4.2 (semver)
Create a notification for this product.
Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 4.19.198 , ≤ 4.19.* (semver)
Unaffected: 5.4.134 , ≤ 5.4.* (semver)
Unaffected: 5.10.52 , ≤ 5.10.* (semver)
Unaffected: 5.12.19 , ≤ 5.12.* (semver)
Unaffected: 5.13.4 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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We can then rely on the\\niscsi_session_teardown-\u003eiscsi_remove_session-\u003e__iscsi_unbind_session call\\nto remove the target and it\u0027s devices, and know after that point there is\\nno device or scsi-ml callout trying to access the session.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: iscsi: corrige el uso de la conexi\u00f3n despu\u00e9s de liberarla durante los reinicios. Si no hemos realizado una llamada de destino de desvinculaci\u00f3n, podemos correr donde iscsi_conn_teardown activa el subproceso EH y luego libera la conexi\u00f3n mientras esos Los hilos todav\u00eda est\u00e1n accediendo a la conexi\u00f3n ehwait. Solo podemos hacer un TMF por sesi\u00f3n, por lo que esto simplemente mueve los campos TMF de la conexi\u00f3n a la sesi\u00f3n. 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      "current_release_date": "2026-08-04T19:57:58+00:00",
      "cve": "CVE-2021-47328",
      "id": "CVE-2021-47328",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "42",
      "product_status:known_not_affected": "156",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: iscsi: Fix conn use after free during resets",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47328.json",
      "version": "3"
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      "current_release_date": "2026-08-06T02:07:05Z",
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      "product_status:known_not_affected": "200",
      "product_status:recommended": "219",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47328",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47328.json",
      "version": "61"
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Use-after-free of iscsi_conn (including ehwait and related fields) allows the freed object to be reclaimed and reused, enabling kernel memory disclosure primitives.\\nI:H - The same iscsi_conn UAF enables heap spray and corruption of the freed object (timers, waitqueue, work items), providing write/control-flow primitives for integrity compromise and code execution.\\nA:H - Accessing freed conn-\u003eehwait after iscsi_conn_teardown causes kernel oops/panic, so availability impact is high even without full exploitation.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"660d0831d1494a6837b2f810d08b5be092c1f31d\", \"lessThan\": \"bf20d85a88384574fabb3d53ad62a8af57e7ab11\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"660d0831d1494a6837b2f810d08b5be092c1f31d\", \"lessThan\": \"d04958a348e560938410e04a12fb99da9c7e6a00\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"660d0831d1494a6837b2f810d08b5be092c1f31d\", \"lessThan\": \"89812e7957ab0746eab66ed6fc49d52bb4dca250\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"660d0831d1494a6837b2f810d08b5be092c1f31d\", \"lessThan\": \"f0a031f7c55ffd944fead1ddaf2aa94df9a158c1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"660d0831d1494a6837b2f810d08b5be092c1f31d\", \"lessThan\": \"fa9542b35ceb4202e8f8d65f440529a63524dca9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"660d0831d1494a6837b2f810d08b5be092c1f31d\", \"lessThan\": \"ec29d0ac29be366450a7faffbcf8cba3a6a3b506\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"861a9633c22ee8b484e1b4054995f7e1b94a3834\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"0adcec66bce9b7e84847da09ae3f8bc36e753312\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"20b38ab5b687df3dbb873cfb0efa946a021f890a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"71b6a23ea944c6a30958bd15a69211e1fd521e1e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3.2.72\", \"lessThan\": \"3.3\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.4.111\", \"lessThan\": \"3.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"3.18.22\", \"lessThan\": \"3.19\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.1.7\", \"lessThan\": \"4.2\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/scsi/libiscsi.c\", \"include/scsi/libiscsi.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.198\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.134\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.52\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.13.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/scsi/libiscsi.c\", \"include/scsi/libiscsi.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/bf20d85a88384574fabb3d53ad62a8af57e7ab11\"}, {\"url\": \"https://git.kernel.org/stable/c/d04958a348e560938410e04a12fb99da9c7e6a00\"}, {\"url\": \"https://git.kernel.org/stable/c/89812e7957ab0746eab66ed6fc49d52bb4dca250\"}, {\"url\": \"https://git.kernel.org/stable/c/f0a031f7c55ffd944fead1ddaf2aa94df9a158c1\"}, {\"url\": \"https://git.kernel.org/stable/c/fa9542b35ceb4202e8f8d65f440529a63524dca9\"}, {\"url\": \"https://git.kernel.org/stable/c/ec29d0ac29be366450a7faffbcf8cba3a6a3b506\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nscsi: iscsi: Fix conn use after free during resets\\n\\nIf we haven\u0027t done a unbind target call we can race where\\niscsi_conn_teardown wakes up the EH thread and then frees the conn while\\nthose threads are still accessing the conn ehwait.\\n\\nWe can only do one TMF per session so this just moves the TMF fields from\\nthe conn to the session. We can then rely on the\\niscsi_session_teardown-\u003eiscsi_remove_session-\u003e__iscsi_unbind_session call\\nto remove the target and it\u0027s devices, and know after that point there is\\nno device or scsi-ml callout trying to access the session.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.198\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.134\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.52\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.19\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13.4\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14\", \"versionStartIncluding\": \"4.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.2.72\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.4.111\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"3.18.22\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.1.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:47:16.792Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47328\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:47:16.792Z\", \"dateReserved\": \"2024-05-21T14:28:16.975Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:35:40.479Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.