CVE-2021-47142

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amdgpu_ttm_backend_destroy+0x29/0x130 [amdgpu]\n[ 1236.008464] ttm_tt_destroy+0x1e/0x30 [ttm]\n[ 1236.013066] ttm_bo_cleanup_memtype_use+0x51/0xa0 [ttm]\n[ 1236.018783] ttm_bo_release+0x262/0xa50 [ttm]\n[ 1236.023547] ttm_bo_put+0x82/0xd0 [ttm]\n[ 1236.027766] amdgpu_bo_unref+0x26/0x50 [amdgpu]\n[ 1236.032809] amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x7aa/0xd90 [amdgpu]\n[ 1236.040400] kfd_ioctl_alloc_memory_of_gpu+0xe2/0x330 [amdgpu]\n[ 1236.046912] kfd_ioctl+0x463/0x690 [amdgpu]"}], "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 bug is reached through local ioctls on /dev/kfd (kfd_ioctl_alloc_memory_of_gpu with KFD_IOC_ALLOC_MEM_FLAGS_USERPTR) or the DRM render-node AMDGPU_GEM_USERPTR path, not via network packet processing.\nAC:L - An unprivileged local attacker can reliably drive the userptr populate/unpopulate/destroy sequence via KFD/DRM ioctls and control concurrent GPU memory operations; no conditions outside attacker influence are required to hit the dangling ttm->sg use.\nPR:L - /dev/kfd and DRM render nodes are mode 0660 group render (with uaccess for seated users); kfd_open and the GEM userptr ioctl perform no capability checks, so a normal unprivileged render-group user can reach the vulnerable code.\nUI:N - Exploitation requires only the attacker\u2019s own ioctl calls against the GPU device nodes; no separate victim action is needed.\nS:U - The vulnerability corrupts kernel memory within the host kernel\u2019s authority and enables local privilege escalation, but does not cross a VM/IOMMU/sandbox boundary.\nC:H - This is a use-after-free of the kmalloc\u2019d sg_table: after kfree(ttm->sg) without NULLing, later unbind reads the freed object, and reclaim/spray of that slab can expose arbitrary kernel memory contents.\nI:H - Use of the reclaimed dangling ttm->sg in sg_free_table() yields an attacker-controlled scatterlist walk/arbitrary free primitive, which is a standard path to arbitrary kernel write and control-flow hijacking.\nA:H - The demonstrated failure is a kernel general protection fault/oops in sg_free_table during amdgpu_ttm_backend_unbind, so availability impact is complete host crash."}]}], "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_ttm.c"], "versions": [{"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "0707c3fea8102d211631ba515ef2159707561b0d", "status": "affected", "versionType": "git"}, {"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "3293cf3513d69f00c14d43e2020826d45ea0e46a", "status": "affected", "versionType": "git"}, {"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "952ab3f9f48eb0e8050596d41951cf516be6b122", "status": 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that slab can expose arbitrary kernel memory contents.\nI:H - Use of the reclaimed dangling ttm->sg in sg_free_table() yields an attacker-controlled scatterlist walk/arbitrary free primitive, which is a standard path to arbitrary kernel write and control-flow hijacking.\nA:H - The demonstrated failure is a kernel general protection fault/oops in sg_free_table during amdgpu_ttm_backend_unbind, so availability impact is complete host crash."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "0707c3fea8102d211631ba515ef2159707561b0d", "versionType": "git"}, {"status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": "3293cf3513d69f00c14d43e2020826d45ea0e46a", "versionType": "git"}, {"status": "affected", "version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21", "lessThan": 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{"lessThanOrEqual": "4.9.*", "status": "unaffected", "version": "4.9.271", "versionType": "semver"}, {"lessThanOrEqual": "4.14.*", "status": "unaffected", "version": "4.14.235", "versionType": "semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.193", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.124", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.42", "versionType": "semver"}, {"lessThanOrEqual": "5.12.*", "status": "unaffected", "version": "5.12.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.13", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3B637FF8-3372-4BEA-89EE-EC94A37C4E6B", "versionEndExcluding": "4.4.271", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "C01BF34A-CD21-4B2F-9877-C89B8202B09A", "versionEndExcluding": "4.9.271", "versionStartIncluding": "4.9.0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "EB08F414-2E2A-4A3A-B0F9-34971290361E", "versionEndExcluding": "4.14.235", "versionStartIncluding": "4.14.0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "3D9A274D-8292-4470-A4BC-05F346C5C26B", "versionEndExcluding": "4.19.193", "versionStartIncluding": "4.19.0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F717E3E3-B420-411F-AECC-2D26A9F33F0F", "versionEndExcluding": "5.4.124", "versionStartIncluding": "5.4.0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "18765089-FB00-4E06-82C2-69FE64CAB42D", "versionEndExcluding": "5.10.42", "versionStartIncluding": "5.10.0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B1F28E29-3C08-49BB-BCE1-C601F43C091D", "versionEndExcluding": "5.12.9", "versionStartIncluding": "5.12.0", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*", "matchCriteriaId": "96AC23B2-D46A-49D9-8203-8E1BEDCA8532", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Fix a use-after-free\n\nlooks like we forget to set ttm->sg to NULL.\nHit panic below\n\n[ 1235.844104] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b7b4b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI\n[ 1235.989074] Call Trace:\n[ 1235.991751] sg_free_table+0x17/0x20\n[ 1235.995667] amdgpu_ttm_backend_unbind.cold+0x4d/0xf7 [amdgpu]\n[ 1236.002288] amdgpu_ttm_backend_destroy+0x29/0x130 [amdgpu]\n[ 1236.008464] ttm_tt_destroy+0x1e/0x30 [ttm]\n[ 1236.013066] ttm_bo_cleanup_memtype_use+0x51/0xa0 [ttm]\n[ 1236.018783] ttm_bo_release+0x262/0xa50 [ttm]\n[ 1236.023547] ttm_bo_put+0x82/0xd0 [ttm]\n[ 1236.027766] amdgpu_bo_unref+0x26/0x50 [amdgpu]\n[ 1236.032809] amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x7aa/0xd90 [amdgpu]\n[ 1236.040400] kfd_ioctl_alloc_memory_of_gpu+0xe2/0x330 [amdgpu]\n[ 1236.046912] kfd_ioctl+0x463/0x690 [amdgpu]"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amdgpu: se soluciona un problema de use-after-free que parece que nos olvidamos de configurar ttm->sg en NULL. Se produce p\u00e1nico a continuaci\u00f3n [1235.844104] falla de protecci\u00f3n general, probablemente para la direcci\u00f3n no can\u00f3nica 0x6b6b6b6b6b6b7b4b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI [1235.989074] Seguimiento de llamadas: [1235.991751] sg_free_table+0x17/0x20 [ 123 5.995667] amdgpu_ttm_backend_unbind.cold+0x4d/0xf7 [amdgpu] [ 1236.002288] amdgpu_ttm_backend_destroy+0x29/0x130 [amdgpu] [ 1236.008464] ttm_tt_destroy+0x1e/0x30 [ttm] [ 1236.013066] ttm_bo_cleanup_memtype_use+0x51/0xa 0 [ttm] [ 1236.018783] ttm_bo_release+0x262/0xa50 [ttm] [ 1236.023547] ttm_bo_put+0x82/0xd0 [ttm] [ 1236.027766] amdgpu_bo_unref+0x26/0x50 [amdgpu] [ 1236.032809] amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x7aa/0xd90 [amdgpu] [ 123 6.040400] kfd_ioctl_alloc_memory_of_gpu+0xe2/0x330 [amdgpu] [ 1236.046912] kfd_ioctl+0x463/0x690 [ amdgpu]"}], "id": "CVE-2021-47142", "lastModified": "2026-08-04T10:16:48.643", "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-2021-47142", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:55:00.553933Z", "version": "2.0.3"}}]}, "published": "2024-03-25T09:15:08.843", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0707c3fea8102d211631ba515ef2159707561b0d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1e5c37385097c35911b0f8a0c67ffd10ee1af9a2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3293cf3513d69f00c14d43e2020826d45ea0e46a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7398c2aab4da960761ec182d04d6d5abbb4a226e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/952ab3f9f48eb0e8050596d41951cf516be6b122"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a849e218556f932576c0fb1c5a88714b61709a17"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d4ea141fd4b40636a8326df5a377d9c5cf9b3faa"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f98cdf084405333ee2f5be548a91b2d168e49276"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/0707c3fea8102d211631ba515ef2159707561b0d"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1e5c37385097c35911b0f8a0c67ffd10ee1af9a2"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3293cf3513d69f00c14d43e2020826d45ea0e46a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7398c2aab4da960761ec182d04d6d5abbb4a226e"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/952ab3f9f48eb0e8050596d41951cf516be6b122"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a849e218556f932576c0fb1c5a88714b61709a17"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d4ea141fd4b40636a8326df5a377d9c5cf9b3faa"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f98cdf084405333ee2f5be548a91b2d168e49276"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: drm/amdgpu: Fix a use-after-free", "id": "2271480", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2271480"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.4", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/amdgpu: Fix a use-after-free\nlooks like we forget to set ttm->sg to NULL.\nHit panic below\n[ 1235.844104] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b7b4b: 0000 [#1] SMP DEBUG_PAGEALLOC NOPTI\n[ 1235.989074] Call Trace:\n[ 1235.991751] sg_free_table+0x17/0x20\n[ 1235.995667] amdgpu_ttm_backend_unbind.cold+0x4d/0xf7 [amdgpu]\n[ 1236.002288] amdgpu_ttm_backend_destroy+0x29/0x130 [amdgpu]\n[ 1236.008464] ttm_tt_destroy+0x1e/0x30 [ttm]\n[ 1236.013066] ttm_bo_cleanup_memtype_use+0x51/0xa0 [ttm]\n[ 1236.018783] ttm_bo_release+0x262/0xa50 [ttm]\n[ 1236.023547] ttm_bo_put+0x82/0xd0 [ttm]\n[ 1236.027766] amdgpu_bo_unref+0x26/0x50 [amdgpu]\n[ 1236.032809] amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu+0x7aa/0xd90 [amdgpu]\n[ 1236.040400] kfd_ioctl_alloc_memory_of_gpu+0xe2/0x330 [amdgpu]\n[ 1236.046912] kfd_ioctl+0x463/0x690 [amdgpu]", "A vulnerability was found in DRM (Direct Rendering Manager) AMDGPU driver of Linux Kernel, where an use-after-free occurred due to the failure to properly set ttm->sg to NULL, leads to a panic scenario causing potential memory corruption."], "mitigation": {"lang": "en:us", "value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."}, "name": "CVE-2021-47142", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "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": "2024-03-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47142\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47142\nhttps://lore.kernel.org/linux-cve-announce/2024032558-CVE-2021-47142-9319@gregkh/T"], "threat_severity": "Moderate"}

{}