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CVE-2021-47188 (GCVE-0-2021-47188)

Vulnerability from cvelistv5 – Published: 2024-04-10 18:56 – Updated: 2026-08-05 08:46
VLAI
Title
scsi: ufs: core: Improve SCSI abort handling
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: core: Improve SCSI abort handling The following has been observed on a test setup: WARNING: CPU: 4 PID: 250 at drivers/scsi/ufs/ufshcd.c:2737 ufshcd_queuecommand+0x468/0x65c Call trace: ufshcd_queuecommand+0x468/0x65c scsi_send_eh_cmnd+0x224/0x6a0 scsi_eh_test_devices+0x248/0x418 scsi_eh_ready_devs+0xc34/0xe58 scsi_error_handler+0x204/0x80c kthread+0x150/0x1b4 ret_from_fork+0x10/0x30 That warning is triggered by the following statement: WARN_ON(lrbp->cmd); Fix this warning by clearing lrbp->cmd from the abort handler.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 15:50 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7a3e97b0dc4bbac2ba7803564ab0057722689921 , < 9491bc16082d9a402c9099acbfffc89af6f9316f (git)
Affected: 7a3e97b0dc4bbac2ba7803564ab0057722689921 , < c36baca06efa833adaefba61f45fefdc49b6d070 (git)
Affected: 7a3e97b0dc4bbac2ba7803564ab0057722689921 , < 3ff1f6b6ba6f97f50862aa50e79959cc8ddc2566 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.4
Unaffected: 0 , < 3.4 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.5 , ≤ 5.15.* (semver)
Unaffected: 5.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-04T23:04:52+00:00",
      "cve": "CVE-2021-47188",
      "id": "CVE-2021-47188",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_affected": "28",
      "product_status:known_not_affected": "170",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: ufs: core: Improve SCSI abort handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47188.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-13T00:01:48Z",
      "cve": "CVE-2021-47188",
      "id": "CVE-2021-47188",
      "initial_release_date": "2024-04-12T02:21:03Z",
      "product_status:known_affected": "445",
      "product_status:known_not_affected": "76",
      "product_status:recommended": "547",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47188",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47188.json",
      "version": "63"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2024-08-04T05:32:07.411Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/c36baca06efa833adaefba61f45fefdc49b6d070"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://git.kernel.org/stable/c/3ff1f6b6ba6f97f50862aa50e79959cc8ddc2566"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2021-47188",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:50:11.298126Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2024-09-11T12:42:17.878Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/scsi/ufs/ufshcd.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "9491bc16082d9a402c9099acbfffc89af6f9316f",
                  "status": "affected",
                  "version": "7a3e97b0dc4bbac2ba7803564ab0057722689921",
                  "versionType": "git"
                },
                {
                  "lessThan": "c36baca06efa833adaefba61f45fefdc49b6d070",
                  "status": "affected",
                  "version": "7a3e97b0dc4bbac2ba7803564ab0057722689921",
                  "versionType": "git"
                },
                {
                  "lessThan": "3ff1f6b6ba6f97f50862aa50e79959cc8ddc2566",
                  "status": "affected",
                  "version": "7a3e97b0dc4bbac2ba7803564ab0057722689921",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/scsi/ufs/ufshcd.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "3.4"
                },
                {
                  "lessThan": "3.4",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.258",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.5",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.16",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.258",
                      "versionStartIncluding": "3.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.5",
                      "versionStartIncluding": "3.4",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.16",
                      "versionStartIncluding": "3.4",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
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              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ufs: core: Improve SCSI abort handling\n\nThe following has been observed on a test setup:\n\nWARNING: CPU: 4 PID: 250 at drivers/scsi/ufs/ufshcd.c:2737 ufshcd_queuecommand+0x468/0x65c\nCall trace:\n ufshcd_queuecommand+0x468/0x65c\n scsi_send_eh_cmnd+0x224/0x6a0\n scsi_eh_test_devices+0x248/0x418\n scsi_eh_ready_devs+0xc34/0xe58\n scsi_error_handler+0x204/0x80c\n kthread+0x150/0x1b4\n ret_from_fork+0x10/0x30\n\nThat warning is triggered by the following statement:\n\n\tWARN_ON(lrbp-\u003ecmd);\n\nFix this warning by clearing lrbp-\u003ecmd from the abort handler."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The bug is in the UFS host controller\u0027s local SCSI abort/completion path (ufshcd_abort \u2192 stale lrbp-\u003ecmd), reached only via local block/filesystem I/O and the SCSI error handler on the device\u0027s UFS storage controller, not via any network or adjacent protocol.\nAC:L - A local attacker can drive concurrent deep-queue UFS I/O that induces command timeouts and abort handling, and once abort succeeds the stale lrbp-\u003ecmd path is deterministic; similar UFS abort races are hit under ordinary load without conditions outside the attacker\u0027s influence.\nPR:L - An unprivileged local user with ordinary filesystem or block I/O access to UFS-backed storage (typical on Android phones and embedded devices) can submit the traffic that times out and enters ufshcd_abort; root or special capabilities are not required.\nUI:N - Exploitation is driven entirely by the attacker\u0027s own I/O and the kernel\u0027s SCSI timeout/error-handler threads; no separate victim action such as mounting a volume or opening a file is required.\nS:U - Impact stays inside the host kernel\u0027s security authority (corrupt/crash the UFS driver and kernel memory); this is not a VM escape, IOMMU bypass, or sandbox boundary cross.\nC:H - Leaving lrbp-\u003ecmd set after a successful abort creates a dangling pointer to a scsi_cmnd that the midlayer may finish and free/reuse; a later transfer_req_compl pass then reads through that object (status/monitor/trace paths), which is a use-after-free enabling arbitrary kernel memory disclosure.\nI:H - The same stale-cmd completion path can scsi_dma_unmap and write cmd-\u003eresult on a reused scsi_cmnd, and may scsi_done a recycled command\u2014heap corruption and control-flow integrity compromise consistent with a UAF write primitive.\nA:H - The bug produces WARN_ON in ufshcd_queuecommand during EH and use-after-free crashes/oopses in the completion path on the system\u0027s primary storage controller, which panics or permanently wedges the device under typical Android/embedded panic_on_oops settings."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:46:34.863Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/9491bc16082d9a402c9099acbfffc89af6f9316f"
            },
            {
              "url": "https://git.kernel.org/stable/c/c36baca06efa833adaefba61f45fefdc49b6d070"
            },
            {
              "url": "https://git.kernel.org/stable/c/3ff1f6b6ba6f97f50862aa50e79959cc8ddc2566"
            }
          ],
          "title": "scsi: ufs: core: Improve SCSI abort handling",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47188",
        "datePublished": "2024-04-10T18:56:27.567Z",
        "dateReserved": "2024-03-25T09:12:14.113Z",
        "dateUpdated": "2026-08-05T08:46:34.863Z",
        "state": "PUBLISHED"
      },
      "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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.