{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47551", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-05-24T15:02:54.832Z", "datePublished": "2024-05-24T15:09:54.635Z", "dateUpdated": "2026-08-05T08:48:20.962Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:48:20.962Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again\n\nIn SRIOV configuration, the reset may failed to bring asic back to normal but stop cpsch\nalready been called, the start_cpsch will not be called since there is no resume in this\ncase. When reset been triggered again, driver should avoid to do uninitialization again." } ], "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 stop_cpsch path is reached during GPU reset of an AMD KFD device (via /dev/kfd or DRM render-node workloads that hang the GPU), requiring local access to the compute/graphics device nodes rather than network packet processing.\nAC:L - An attacker who can submit GPU work can induce an HWS hang that schedules reset; in SRIOV, amdgpu_device_reset_sriov retries after failure and re-enters stop_cpsch without start_cpsch, so the double-uninit is reliably hit once a reset fails or is retried.\nPR:L - Triggering requires only unprivileged access to /dev/kfd or a DRM render node (typically render-group membership), not real root or init-namespace capabilities.\nUI:N - The attacker triggers GPU hang and subsequent reset through their own device ioctls; no separate victim action is required.\nS:U - The double-free and panic occur in the same kernel that hosts the amdkfd driver (including a guest with an SRIOV VF); this does not cross a VM/IOMMU security boundary into the host.\nC:H - stop_cpsch frees dqm->fence_mem without NULLing it, so a second call is a use-after-free of the kfd_mem_obj; per UAF guidance this can be leveraged for arbitrary kernel read/disclosure primitives.\nI:H - The same dangling fence_mem leads to a double kfree and GTT SA bitmap corruption, and pm_uninit is invoked twice on a torn-down packet manager—memory corruption consistent with write/control-flow hijack primitives.\nA:H - The second stop_cpsch causes kernel panic/oops via UAF/double-free and NULL dereference in kernel_queue_uninit(pm->priv_queue) after priv_queue was already set to NULL." } ] } ], "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/amdkfd/kfd_device_queue_manager.c" ], "versions": [ { "version": "2c99a547bcf9bb8532abd2953479949018449f93", "lessThan": "74aafe99efb68f15e50be9f7032c2168512f98a8", "status": "affected", "versionType": "git" }, { "version": "2c99a547bcf9bb8532abd2953479949018449f93", "lessThan": "06c6f8f86ec243b89e52f0c3dc7062bcb9de74df", "status": "affected", "versionType": "git" }, { "version": "2c99a547bcf9bb8532abd2953479949018449f93", "lessThan": "2cf49e00d40d5132e3d067b5aa6d84791929ab15", "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/amdkfd/kfd_device_queue_manager.c" ], "versions": [ { "version": "5.5", "status": "affected" }, { "version": "0", "lessThan": "5.5", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.84", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.7", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16", "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": "5.5", "versionEndExcluding": "5.10.84" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.15.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.5", "versionEndExcluding": "5.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/74aafe99efb68f15e50be9f7032c2168512f98a8" }, { "url": "https://git.kernel.org/stable/c/06c6f8f86ec243b89e52f0c3dc7062bcb9de74df" }, { "url": "https://git.kernel.org/stable/c/2cf49e00d40d5132e3d067b5aa6d84791929ab15" } ], "title": "drm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-770", "lang": "en", "description": "CWE-770 Allocation of Resources Without Limits or Throttling" } ] } ], "affected": [ { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "0", "status": "unaffected", "lessThanOrEqual": "5.16", "versionType": "custom" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:5.10.84:*:*:*:*:*:*:*" ], "defaultStatus": "unknown", "versions": [ { "version": "0", "status": "unaffected", "lessThanOrEqual": "5.10.84", "versionType": "custom" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "CHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-05-28T15:41:59.377852Z", "id": "CVE-2021-47551", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-05-22T13:29:22.031Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:39:59.853Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/74aafe99efb68f15e50be9f7032c2168512f98a8", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/06c6f8f86ec243b89e52f0c3dc7062bcb9de74df", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/2cf49e00d40d5132e3d067b5aa6d84791929ab15", "tags": [ "x_transferred" ] } ] } ] } }