CVE-2021-47421

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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's pci_channel_io_frozen."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"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's 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(&adev->reset_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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu.h", "drivers/gpu/drm/amd/amdgpu/amdgpu_device.c"], "versions": [{"version": "c9a6b82f45e261d247b980a7949aaa6a9bfffe01", "lessThan": "785cc093b6b5a93cc350421a55f3f1eda6585156", "status": "affected", "versionType": "git"}, {"version": "c9a6b82f45e261d247b980a7949aaa6a9bfffe01", "lessThan": "72e9a1bf9b722628c28092e0c2cd8717edd201dc", "status": "affected", "versionType": "git"}, {"version": "c9a6b82f45e261d247b980a7949aaa6a9bfffe01", "lessThan": "248b061689a40f4fed05252ee2c89f87cf26d7d8", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu.h", "drivers/gpu/drm/amd/amdgpu/amdgpu_device.c"], "versions": [{"version": "5.10", "status": "affected"}, {"version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.241", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.14.12", "lessThanOrEqual": "5.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.10.241"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.14.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/785cc093b6b5a93cc350421a55f3f1eda6585156"}, {"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"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dc", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8", "tags": ["x_transferred"]}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:30:56.972Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2021-47421", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T15:37:47.598437Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:32:56.726Z"}}]}}

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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's 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(&adev->reset_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."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "c9a6b82f45e261d247b980a7949aaa6a9bfffe01", "lessThan": "785cc093b6b5a93cc350421a55f3f1eda6585156", "versionType": "git"}, {"status": "affected", "version": "c9a6b82f45e261d247b980a7949aaa6a9bfffe01", "lessThan": "72e9a1bf9b722628c28092e0c2cd8717edd201dc", "versionType": "git"}, {"status": "affected", "version": "c9a6b82f45e261d247b980a7949aaa6a9bfffe01", "lessThan": "248b061689a40f4fed05252ee2c89f87cf26d7d8", "versionType": "git"}], "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu.h", "drivers/gpu/drm/amd/amdgpu/amdgpu_device.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.10"}, {"status": "unaffected", "version": "0", "lessThan": "5.10", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.241", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.14.12", "versionType": "semver", "lessThanOrEqual": "5.14.*"}, {"status": "unaffected", "version": "5.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/gpu/drm/amd/amdgpu/amdgpu.h", "drivers/gpu/drm/amd/amdgpu/amdgpu_device.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/785cc093b6b5a93cc350421a55f3f1eda6585156"}, {"url": "https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dc"}, {"url": "https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8"}], "x_generator": {"engine": "bippy-1.2.0"}, "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's pci_channel_io_frozen."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.241", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.14.12", "versionStartIncluding": "5.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15", "versionStartIncluding": "5.10"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:47:45.513Z"}}}, "cveMetadata": {"cveId": "CVE-2021-47421", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:47:45.513Z", "dateReserved": "2024-05-21T14:58:30.820Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-05-21T15:04:09.296Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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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's pci_channel_io_frozen."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amdgpu: maneja el caso de pci_channel_io_frozen solo en amdgpu_pci_resume. En el c\u00f3digo actual, cuando se detecta un estado de error de PCI pci_channel_io_normal, informar\u00e1 el estado de PCI_ERS_RESULT_CAN_RECOVER al controlador PCI, y el controlador PCI contin\u00fae la ejecuci\u00f3n de PCI resume callback report_resume mediante pci_walk_bridge, y la devoluci\u00f3n de llamada finalmente ir\u00e1 a amdgpu_pci_resume, donde el bloqueo de escritura se libera incondicionalmente sin adquirir dicho bloqueo primero. En este caso, se producir\u00e1 un punto muerto cuando otros subprocesos comiencen a adquirir el bloqueo de lectura. Para solucionar este problema, agregue un miembro en la estructura amdgpu_device para almacenar en cach\u00e9 pci_channel_state y solo contin\u00fae la ejecuci\u00f3n en amdgpu_pci_resume cuando sea pci_channel_io_frozen."}], "id": "CVE-2021-47421", "lastModified": "2026-08-04T10:17:02.850", "metrics": {"cvssMetricV31": [{"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": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "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"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47421", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:37:47.598437Z", "version": "2.0.3"}}]}, "published": "2024-05-21T15:15:27.537", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/785cc093b6b5a93cc350421a55f3f1eda6585156"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dc"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-667"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: drm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume", "id": "2282312", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282312"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-667", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume\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.\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's pci_channel_io_frozen."], "name": "CVE-2021-47421", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "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": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "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-2021-47421\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47421\nhttps://lore.kernel.org/linux-cve-announce/2024052155-CVE-2021-47421-00f1@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-07-12T22:09:30.522726+00:00", "updated": "2025-07-12T22:09:30.522791+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}