CVE-2021-47551

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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\u2014memory 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": 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When reset been triggered again, driver should avoid to do uninitialization again."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: drm/amd/amdkfd: corrige el p\u00e1nico del kernel cuando el reinicio falla y se activa nuevamente. En la configuraci\u00f3n SRIOV, el reinicio puede no lograr que asic vuelva a la normalidad, pero ya se ha llamado a detener cpsch, el No se llamar\u00e1 a start_cpsch ya que en este caso no hay ning\u00fan curr\u00edculum. Cuando el reinicio se activa nuevamente, el controlador debe evitar realizar la desinicializaci\u00f3n nuevamente."}], "id": "CVE-2021-47551", "lastModified": "2026-08-04T10:17:08.283", "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": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.0, "impactScore": 4.0, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47551", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-05-28T15:41:59.377852Z", "version": "2.0.3"}}]}, "published": "2024-05-24T15:15:19.927", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/06c6f8f86ec243b89e52f0c3dc7062bcb9de74df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2cf49e00d40d5132e3d067b5aa6d84791929ab15"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/74aafe99efb68f15e50be9f7032c2168512f98a8"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/06c6f8f86ec243b89e52f0c3dc7062bcb9de74df"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/2cf49e00d40d5132e3d067b5aa6d84791929ab15"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/74aafe99efb68f15e50be9f7032c2168512f98a8"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: drm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again", "id": "2283398", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2283398"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.1", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-372", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/amd/amdkfd: Fix kernel panic when reset failed and been triggered again\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."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2021-47551", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not 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": "2024-05-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47551\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47551\nhttps://lore.kernel.org/linux-cve-announce/2024052442-CVE-2021-47551-0318@gregkh/T"], "statement": "Red Hat Enterprise Linux is not impacted by this CVE, as the vulnerability in question does not affect the specific versions or configurations of the Linux kernel used in its distributions. This ensures that users of Red Hat Enterprise Linux are not exposed to the potential risks associated with this issue, and no further action or mitigation is necessary for systems running this operating system.", "threat_severity": "Moderate"}

{}