CVE-2021-47328 (GCVE-0-2021-47328)
Vulnerability from cvelistv5
Published
2024-05-21 14:35
Modified
2026-08-05 08:47
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 660d0831d1494a6837b2f810d08b5be092c1f31d
Version: 660d0831d1494a6837b2f810d08b5be092c1f31d
Version: 660d0831d1494a6837b2f810d08b5be092c1f31d
Version: 660d0831d1494a6837b2f810d08b5be092c1f31d
Version: 660d0831d1494a6837b2f810d08b5be092c1f31d
Version: 660d0831d1494a6837b2f810d08b5be092c1f31d
Version: 861a9633c22ee8b484e1b4054995f7e1b94a3834
Version: 0adcec66bce9b7e84847da09ae3f8bc36e753312
Version: 20b38ab5b687df3dbb873cfb0efa946a021f890a
Version: 71b6a23ea944c6a30958bd15a69211e1fd521e1e
Version: 3.2.72   ≤
Version: 3.4.111   ≤
Version: 3.18.22   ≤
Version: 4.1.7   ≤
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This is the iSCSI initiator (libiscsi) path; a remote target peer can induce SCSI failures/timeouts so EH blocks on conn-\u003eehwait, then drive session cleanup over the same TCP session so iscsid issues DESTROY_CONN/iscsi_conn_teardown while devices are still bound.\\nAC:L - The attacker controlling the iSCSI target can withhold completions to keep SCSI EH on ehwait and then force connection/session teardown, so they control both sides of the race with no reliance on unrelated host conditions.\\nPR:N - A malicious or compromised iSCSI target needs no privileges on the victim host; once a logged-in session exists (typical SAN/cloud block deployment), the peer can trigger the UAF without local credentials.\\nUI:N - No additional user action is required beyond an already-established iSCSI session with in-flight I/O; recovery and destroy-before-unbind cleanup are driven by normal initiator reaction to peer failures.\\nS:U - The UAF is in host kernel initiator memory (iscsi_conn ehwait/TMF state) and does not cross a VM, IOMMU, or other security-authority boundary.\\nC:H - 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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