CVE-2021-47328

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We can then rely on the\niscsi_session_teardown->iscsi_remove_session->__iscsi_unbind_session call\nto remove the target and it's devices, and know after that point there is\nno device or scsi-ml callout trying to access the session."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - This is the iSCSI initiator (libiscsi) path; a remote target peer can induce SCSI failures/timeouts so EH blocks on conn->ehwait, 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->ehwait after iscsi_conn_teardown causes kernel oops/panic, so availability 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"fa9542b35ceb4202e8f8d65f440529a63524dca9", "status": "affected", "versionType": "git"}, {"version": "660d0831d1494a6837b2f810d08b5be092c1f31d", "lessThan": "ec29d0ac29be366450a7faffbcf8cba3a6a3b506", "status": "affected", "versionType": "git"}, {"version": "861a9633c22ee8b484e1b4054995f7e1b94a3834", "status": "affected", "versionType": "git"}, {"version": "0adcec66bce9b7e84847da09ae3f8bc36e753312", "status": "affected", "versionType": "git"}, {"version": "20b38ab5b687df3dbb873cfb0efa946a021f890a", "status": "affected", "versionType": "git"}, {"version": "71b6a23ea944c6a30958bd15a69211e1fd521e1e", "status": "affected", "versionType": "git"}, {"version": "3.2.72", "lessThan": "3.3", "status": "affected", "versionType": "semver"}, {"version": "3.4.111", "lessThan": "3.5", "status": "affected", "versionType": "semver"}, {"version": "3.18.22", "lessThan": "3.19", "status": "affected", "versionType": "semver"}, {"version": "4.1.7", "lessThan": "4.2", "status": "affected", "versionType": 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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->ehwait, 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->ehwait 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't 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->iscsi_remove_session->__iscsi_unbind_session call\nto remove the target and it's 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"}, "dataVersion": "5.2"}

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We can then rely on the\niscsi_session_teardown->iscsi_remove_session->__iscsi_unbind_session call\nto remove the target and it's 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. Luego podemos confiar en la llamada iscsi_session_teardown->iscsi_remove_session->__iscsi_unbind_session para eliminar el objetivo y sus dispositivos, y saber despu\u00e9s de ese punto que no hay ning\u00fan dispositivo o llamada scsi-ml intentando acceder a la sesi\u00f3n."}], "id": "CVE-2021-47328", "lastModified": "2026-08-04T10:16:58.130", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47328", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-23T19:06:33.421642Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:19.823", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89812e7957ab0746eab66ed6fc49d52bb4dca250"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bf20d85a88384574fabb3d53ad62a8af57e7ab11"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d04958a348e560938410e04a12fb99da9c7e6a00"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ec29d0ac29be366450a7faffbcf8cba3a6a3b506"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f0a031f7c55ffd944fead1ddaf2aa94df9a158c1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fa9542b35ceb4202e8f8d65f440529a63524dca9"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/89812e7957ab0746eab66ed6fc49d52bb4dca250"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/bf20d85a88384574fabb3d53ad62a8af57e7ab11"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d04958a348e560938410e04a12fb99da9c7e6a00"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/ec29d0ac29be366450a7faffbcf8cba3a6a3b506"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f0a031f7c55ffd944fead1ddaf2aa94df9a158c1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fa9542b35ceb4202e8f8d65f440529a63524dca9"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: scsi: iscsi: Fix conn use after free during resets", "id": "2282433", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282433"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.2", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nscsi: iscsi: Fix conn use after free during resets\nIf we haven't 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.\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->iscsi_remove_session->__iscsi_unbind_session call\nto remove the target and it's devices, and know after that point there is\nno device or scsi-ml callout trying to access the session.", "A vulnerability was found in the Linux kernel's iSCSI subsystem, where the iscsi_conn_teardown() function could use a freed connection during resets. This occurs if the connection is freed while still being accessed by error handler threads, potentially causing system instability or crashes."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47328", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47328\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47328\nhttps://lore.kernel.org/linux-cve-announce/2024052134-CVE-2021-47328-441f@gregkh/T"], "statement": "This vulnerability is rated as a moderate severity because the issue poses a risk of system crashes or instability rather than direct data loss or unauthorized access.", "threat_severity": "Moderate"}

{}