CVE-2021-47421 (GCVE-0-2021-47421)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:04 – Updated: 2026-08-05 08:47
VLAI
Title
drm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume In current code, when a PCI error state pci_channel_io_normal is detectd, it will report PCI_ERS_RESULT_CAN_RECOVER status to PCI driver, and PCI driver will continue the execution of PCI resume callback report_resume by pci_walk_bridge, and the callback will go into amdgpu_pci_resume finally, where write lock is releasd unconditionally without acquiring such lock first. In this case, a deadlock will happen when other threads start to acquire the read lock. To fix this, add a member in amdgpu_device strucutre to cache pci_channel_state, and only continue the execution in amdgpu_pci_resume when it's pci_channel_io_frozen.
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 15:37 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c9a6b82f45e261d247b980a7949aaa6a9bfffe01 , < 785cc093b6b5a93cc350421a55f3f1eda6585156 (git)
Affected: c9a6b82f45e261d247b980a7949aaa6a9bfffe01 , < 72e9a1bf9b722628c28092e0c2cd8717edd201dc (git)
Affected: c9a6b82f45e261d247b980a7949aaa6a9bfffe01 , < 248b061689a40f4fed05252ee2c89f87cf26d7d8 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.14.12 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                "url": "https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8"
              },
              {
                "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2021-47421",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2024-09-10T15:37:47.598437Z",
                    "version": "2.0.3"
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/gpu/drm/amd/amdgpu/amdgpu.h",
                "drivers/gpu/drm/amd/amdgpu/amdgpu_device.c"
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "status": "affected",
                  "version": "c9a6b82f45e261d247b980a7949aaa6a9bfffe01",
                  "versionType": "git"
                },
                {
                  "lessThan": "72e9a1bf9b722628c28092e0c2cd8717edd201dc",
                  "status": "affected",
                  "version": "c9a6b82f45e261d247b980a7949aaa6a9bfffe01",
                  "versionType": "git"
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                {
                  "lessThan": "248b061689a40f4fed05252ee2c89f87cf26d7d8",
                  "status": "affected",
                  "version": "c9a6b82f45e261d247b980a7949aaa6a9bfffe01",
                  "versionType": "git"
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              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
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                "drivers/gpu/drm/amd/amdgpu/amdgpu_device.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.10"
                },
                {
                  "lessThan": "5.10",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.10.*",
                  "status": "unaffected",
                  "version": "5.10.241",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.14.*",
                  "status": "unaffected",
                  "version": "5.14.12",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "5.15",
                  "versionType": "original_commit_for_fix"
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            }
          ],
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              "nodes": [
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                  "cpeMatch": [
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.241",
                      "versionStartIncluding": "5.10",
                      "vulnerable": true
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                    {
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                    },
                    {
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                      "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\ndrm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume\n\nIn current code, when a PCI error state pci_channel_io_normal is detectd,\nit will report PCI_ERS_RESULT_CAN_RECOVER status to PCI driver, and PCI\ndriver will continue the execution of PCI resume callback report_resume by\npci_walk_bridge, and the callback will go into amdgpu_pci_resume\nfinally, where write lock is releasd unconditionally without acquiring\nsuch lock first. In this case, a deadlock will happen when other threads\nstart to acquire the read lock.\n\nTo fix this, add a member in amdgpu_device strucutre to cache\npci_channel_state, and only continue the execution in amdgpu_pci_resume\nwhen it\u0027s pci_channel_io_frozen."
            }
          ],
          "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"
              },
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                {
                  "lang": "en",
                  "value": "AV:L - The vulnerable amdgpu PCI ERS callbacks are reached only from local PCIe AER non-fatal recovery on the AMD GPU (or local aer_inject), not from network packet processing or adjacent-link protocols.\nAC:L - Once a non-fatal AER recovery runs, amdgpu_pci_resume deterministically unlocks without locking and operates on live schedulers; an attacker who can induce AER via GPU work can retry until in-flight jobs make the corruption path hit, with no luck-based race beyond their control.\nPR:L - An unprivileged local user with DRM render-node access (/dev/dri/renderD*, DRM_RENDER_ALLOW ioctls) can submit GPU work that induces PCIe non-fatal AER on amdgpu systems, matching the PR:L treatment used for related amdgpu AER path bugs; CAP_SYS_ADMIN aer_inject is not required.\nUI:N - The attacker triggers AER recovery and subsequent lock/scheduler corruption themselves through local GPU operations; no separate victim action such as mounting a filesystem or opening a crafted file is required.\nS:U - Impact stays within the host kernel\u0027s amdgpu driver authority (deadlock and scheduler/fence list corruption); this is not a VM escape, IOMMU bypass, or other cross-boundary compromise.\nC:H - On the non-fatal path, drm_sched_start(full_recovery=true) re-walks live pending jobs and re-adds dma_fence callbacks that are already linked, corrupting fence cb lists and racing the unparked sched thread on pending_list\u2014an UAF-class primitive enabling arbitrary kernel memory disclosure.\nI:H - The same unsynchronized pending_list walks, double fence-callback insertion, and job re-submission while rings are still running corrupt kernel list/fence state and are exploitable for arbitrary writes and control-flow hijacking; up_write without ownership further corrupts reset_sem concurrency assumptions.\nA:H - amdgpu_device_unlock_adev() calls up_write(\u0026adev-\u003ereset_sem) without a matching down_write on the pci_channel_io_normal path, producing a permanent deadlock for subsequent reset_sem takers, and the concurrent scheduler/fence corruption can also oops/panic the kernel."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T08:47:45.513Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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          "references": [
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              "url": "https://git.kernel.org/stable/c/785cc093b6b5a93cc350421a55f3f1eda6585156"
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            {
              "url": "https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dc"
            },
            {
              "url": "https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8"
            }
          ],
          "title": "drm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume",
          "x_generator": {
            "engine": "bippy-1.2.0"
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      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2021-47421",
        "datePublished": "2024-05-21T15:04:09.296Z",
        "dateReserved": "2024-05-21T14:58:30.820Z",
        "dateUpdated": "2026-08-05T08:47:45.513Z",
        "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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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.