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.
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    "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": {
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          {
            "providerMetadata": {
              "dateUpdated": "2024-08-04T05:32:07.411Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
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                "tags": [
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                ],
                "url": "https://git.kernel.org/stable/c/c36baca06efa833adaefba61f45fefdc49b6d070"
              },
              {
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                ],
                "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": [
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                  "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
                    },
                    {
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                      "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

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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.
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  • 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.



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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.