CVE-2021-47290 (GCVE-0-2021-47290)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:35 – Updated: 2026-08-05 08:47
VLAI
Title
scsi: target: Fix NULL dereference on XCOPY completion
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: target: Fix NULL dereference on XCOPY completion CPU affinity control added with commit 39ae3edda325 ("scsi: target: core: Make completion affinity configurable") makes target_complete_cmd() queue work on a CPU based on se_tpg->se_tpg_wwn->cmd_compl_affinity state. LIO's EXTENDED COPY worker is a special case in that read/write cmds are dispatched using the global xcopy_pt_tpg, which carries a NULL se_tpg_wwn pointer following initialization in target_xcopy_setup_pt(). The NULL xcopy_pt_tpg->se_tpg_wwn pointer is dereferenced on completion of any EXTENDED COPY initiated read/write cmds. E.g using the libiscsi SCSI.ExtendedCopy.Simple test: BUG: kernel NULL pointer dereference, address: 00000000000001a8 RIP: 0010:target_complete_cmd+0x9d/0x130 [target_core_mod] Call Trace: fd_execute_rw+0x148/0x42a [target_core_file] ? __dynamic_pr_debug+0xa7/0xe0 ? target_check_reservation+0x5b/0x940 [target_core_mod] __target_execute_cmd+0x1e/0x90 [target_core_mod] transport_generic_new_cmd+0x17c/0x330 [target_core_mod] target_xcopy_issue_pt_cmd+0x9/0x60 [target_core_mod] target_xcopy_read_source.isra.7+0x10b/0x1b0 [target_core_mod] ? target_check_fua+0x40/0x40 [target_core_mod] ? transport_complete_task_attr+0x130/0x130 [target_core_mod] target_xcopy_do_work+0x61f/0xc00 [target_core_mod] This fix makes target_complete_cmd() queue work on se_cmd->cpuid if se_tpg_wwn is NULL.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:39 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 39ae3edda325e9cf9e978c9788affe88231f3b34 , < e7732c5a19a15a62b0b23fd683a639b0483e1f40 (git)
Affected: 39ae3edda325e9cf9e978c9788affe88231f3b34 , < a47fa41381a09e5997afd762664db4f5f6657e03 (git)
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Linux Linux Affected: 5.13
Unaffected: 0 , < 5.13 (semver)
Unaffected: 5.13.6 , ≤ 5.13.* (semver)
Unaffected: 5.14 , ≤ * (original_commit_for_fix)
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            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: scsi: target: corrige la desreferencia NULL al completar XCOPY. El control de afinidad de CPU agregado con la confirmaci\u00f3n 39ae3edda325 (\"scsi: target: core: hace que la afinidad de finalizaci\u00f3n sea configurable\") hace que la cola target_complete_cmd() funcione una CPU basada en el estado se_tpg-\u0026gt;se_tpg_wwn-\u0026gt;cmd_compl_affinity. El trabajador de COPIA EXTENDIDA de LIO es un caso especial en el que los cmds de lectura/escritura se env\u00edan utilizando el xcopy_pt_tpg global, que lleva un puntero NULL se_tpg_wwn despu\u00e9s de la inicializaci\u00f3n en target_xcopy_setup_pt(). Se elimina la referencia al puntero NULL xcopy_pt_tpg-\u0026gt;se_tpg_wwn al finalizar cualquier cmd de lectura/escritura iniciado por COPIA EXTENDIDA. Por ejemplo, utilizando la prueba libiscsi SCSI.ExtendedCopy.Simple: BUG: desreferencia del puntero NULL del kernel, direcci\u00f3n: 00000000000001a8 RIP: 0010:target_complete_cmd+0x9d/0x130 [target_core_mod] Seguimiento de llamadas: fd_execute_rw+0x148/0x42a [target_core_file] __dynamic_pr_debug+0xa7/0xe0? target_check_reservation+0x5b/0x940 [target_core_mod] __target_execute_cmd+0x1e/0x90 [target_core_mod] transport_generic_new_cmd+0x17c/0x330 [target_core_mod] target_xcopy_issue_pt_cmd+0x9/0x60 [target_core_mod] target_xcopy_read_source.isra.7 +0x10b/0x1b0 [target_core_mod] ? target_check_fua+0x40/0x40 [target_core_mod]? transport_complete_task_attr+0x130/0x130 [target_core_mod] target_xcopy_do_work+0x61f/0xc00 [target_core_mod] Esta soluci\u00f3n hace que la cola target_complete_cmd() funcione en se_cmd-\u0026gt;cpuid si se_tpg_wwn es NULL."
          }
        ],
        "id": "CVE-2021-47290",
        "lastModified": "2026-08-04T10:16:56.470",
        "metrics": {
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              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
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              "impactScore": 3.6,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
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              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
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                "timestamp": "2024-09-10T15:39:25.848722Z",
                "version": "2.0.3"
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        "published": "2024-05-21T15:15:17.027",
        "references": [
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
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                "value": "CWE-476"
              }
            ],
            "source": "nvd@nist.gov",
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    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-09T16:12:05+00:00",
      "cve": "CVE-2021-47290",
      "id": "CVE-2021-47290",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: target: Fix NULL dereference on XCOPY completion",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47290.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-05T01:02:38Z",
      "cve": "CVE-2021-47290",
      "id": "CVE-2021-47290",
      "initial_release_date": "2024-05-23T03:05:00Z",
      "product_status:known_not_affected": "385",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47290",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47290.json",
      "version": "19"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-04T05:32:07.995Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/e7732c5a19a15a62b0b23fd683a639b0483e1f40"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/a47fa41381a09e5997afd762664db4f5f6657e03"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2021-47290",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:39:25.848722Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-09-11T12:42:14.881Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/target/target_core_transport.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "e7732c5a19a15a62b0b23fd683a639b0483e1f40",
                  "status": "affected",
                  "version": "39ae3edda325e9cf9e978c9788affe88231f3b34",
                  "versionType": "git"
                },
                {
                  "lessThan": "a47fa41381a09e5997afd762664db4f5f6657e03",
                  "status": "affected",
                  "version": "39ae3edda325e9cf9e978c9788affe88231f3b34",
                  "versionType": "git"
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              ]
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            {
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              "product": "Linux",
              "programFiles": [
                "drivers/target/target_core_transport.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.13"
                },
                {
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                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
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                  "status": "unaffected",
                  "version": "5.13.6",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.14",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
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              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.13.6",
                      "versionStartIncluding": "5.13",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.14",
                      "versionStartIncluding": "5.13",
                      "vulnerable": true
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                  ],
                  "negate": false,
                  "operator": "OR"
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              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: Fix NULL dereference on XCOPY completion\n\nCPU affinity control added with commit 39ae3edda325 (\"scsi: target: core:\nMake completion affinity configurable\") makes target_complete_cmd() queue\nwork on a CPU based on se_tpg-\u003ese_tpg_wwn-\u003ecmd_compl_affinity state.\n\nLIO\u0027s EXTENDED COPY worker is a special case in that read/write cmds are\ndispatched using the global xcopy_pt_tpg, which carries a NULL se_tpg_wwn\npointer following initialization in target_xcopy_setup_pt().\n\nThe NULL xcopy_pt_tpg-\u003ese_tpg_wwn pointer is dereferenced on completion of\nany EXTENDED COPY initiated read/write cmds. E.g using the libiscsi\nSCSI.ExtendedCopy.Simple test:\n\n  BUG: kernel NULL pointer dereference, address: 00000000000001a8\n  RIP: 0010:target_complete_cmd+0x9d/0x130 [target_core_mod]\n  Call Trace:\n   fd_execute_rw+0x148/0x42a [target_core_file]\n   ? __dynamic_pr_debug+0xa7/0xe0\n   ? target_check_reservation+0x5b/0x940 [target_core_mod]\n   __target_execute_cmd+0x1e/0x90 [target_core_mod]\n   transport_generic_new_cmd+0x17c/0x330 [target_core_mod]\n   target_xcopy_issue_pt_cmd+0x9/0x60 [target_core_mod]\n   target_xcopy_read_source.isra.7+0x10b/0x1b0 [target_core_mod]\n   ? target_check_fua+0x40/0x40 [target_core_mod]\n   ? transport_complete_task_attr+0x130/0x130 [target_core_mod]\n   target_xcopy_do_work+0x61f/0xc00 [target_core_mod]\n\nThis fix makes target_complete_cmd() queue work on se_cmd-\u003ecpuid if\nse_tpg_wwn is NULL."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - A remote SCSI initiator can trigger the bug over network fabrics such as LIO iSCSI/iSER by sending EXTENDED_COPY, which builds passthrough READ/WRITE cmds that complete through target_complete_cmd().\nAC:L - Any successful EXTENDED_COPY that performs read/write I/O hits the NULL se_tpg_wwn dereference on completion; emulate_3pc is enabled by default and no race or external timing is required.\nPR:N - Although CHAP can be enforced, a reasonable exposed LIO target may disable authentication or use open initiator ACLs, so an unauthenticated remote initiator with LUN access is a plausible highest-severity scenario.\nUI:N - No victim user action is required after the target is exported; the attacker sends the SCSI EXTENDED_COPY command directly.\nS:U - Impact remains within the host kernel SCSI target security authority; this is a DoS of the target host itself, not a guest-to-host or other scope-crossing escape.\nC:N - The defect is a pure NULL pointer dereference of se_tpg_wwn when selecting completion CPU affinity and does not leak kernel or storage data.\nI:N - The NULL dereference performs no write or control-flow hijack beyond the crash; there is no memory corruption primitive.\nA:H - The NULL dereference produces a kernel oops/BUG as shown in the fix commit, which can crash or destabilize the target host."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:47:06.047Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
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              "url": "https://git.kernel.org/stable/c/e7732c5a19a15a62b0b23fd683a639b0483e1f40"
            },
            {
              "url": "https://git.kernel.org/stable/c/a47fa41381a09e5997afd762664db4f5f6657e03"
            }
          ],
          "title": "scsi: target: Fix NULL dereference on XCOPY completion",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47290",
        "datePublished": "2024-05-21T14:35:15.411Z",
        "dateReserved": "2024-05-21T13:27:52.129Z",
        "dateUpdated": "2026-08-05T08:47:06.047Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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