CVE-2022-49963

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With an object > 8M we therefore aren't properly\n copying the pages. And then with an object > 64M we trigger the\n GEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER).\n\nSo it looks like our copy handling for any object > 8M (which is our\nCHUNK_SZ) is currently broken on DG2.\n\nTestcase: igt@gem_lmem_swapping\n(cherry picked from commit 8676145eb2f53a9940ff70910caf0125bd8a4bc2)"}], "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 via i915 GEM ioctls on a local DRM render node (GEM_CREATE_EXT of lmem-only objects plus TTM eviction into intel_context_migrate_copy), not via network packet processing.\nAC:L - An attacker can reliably create Flat-CCS lmem objects larger than CHUNK_SZ (8M) and force lmem pressure to trigger eviction; the failure is deterministic once migrate_copy runs on such an object, as shown by gem_lmem_swapping and Mesa/Crucible hits.\nPR:L - Triggering requires only unprivileged access to /dev/dri/renderD* (DRM_RENDER_ALLOW for GEM_CREATE_EXT and related ioctls), not root or init-namespace capabilities.\nUI:N - The attacker opens the render node and allocates/evicts their own objects; no separate victim action is required.\nS:U - Impact stays within the host kernel/GPU driver authority (migration PPGTT corruption and GEM buffer corruption), not a guest-to-host or IOMMU-boundary escape.\nC:H - Oversized blits past the fixed 8M windows can read the migrate VM\u2019s self-mapped PTE region and adjacent mappings into attacker-readable smem backup pages, and can mishandle CCS/metadata during eviction of other clients\u2019 buffers under memory pressure.\nI:H - The same oversized XY copy can write past the destination window into the migration page tables and leave incomplete/incorrect main and CCS copies, corrupting GPU PTEs and buffer contents with no CCS-capable CPU memcpy fallback.\nA:H - Out-of-bounds GTT access and invalid CCS transfer sizing can hang or wedge the GPU (and trip GEM_BUG_ON on debug builds), denying GPU service to the system."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/gpu/drm/i915/gt/intel_migrate.c"], "versions": [{"version": "da0595ae91da837929a00470ab40546090e5b9ae", "lessThan": "97434cb55bd884bd268626ec41489f79b261b2d4", "status": "affected", "versionType": "git"}, {"version": "da0595ae91da837929a00470ab40546090e5b9ae", "lessThan": "8d905254162965c8e6be697d82c7dbf5d08f574d", "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/i915/gt/intel_migrate.c"], "versions": [{"version": "5.19", "status": "affected"}, {"version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver"}, {"version": "5.19.8", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0", "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": "5.19", "versionEndExcluding": "5.19.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/97434cb55bd884bd268626ec41489f79b261b2d4"}, {"url": "https://git.kernel.org/stable/c/8d905254162965c8e6be697d82c7dbf5d08f574d"}], "title": "drm/i915/ttm: fix CCS handling", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-49963", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:29:52.414458Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:31:17.741Z"}}]}}

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With an object > 8M we therefore aren't properly\n copying the pages. And then with an object > 64M we trigger the\n GEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER).\n\nSo it looks like our copy handling for any object > 8M (which is our\nCHUNK_SZ) is currently broken on DG2.\n\nTestcase: igt@gem_lmem_swapping\n(cherry picked from commit 8676145eb2f53a9940ff70910caf0125bd8a4bc2)"}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.19.8", "versionStartIncluding": "5.19"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.0", "versionStartIncluding": "5.19"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:56:54.694Z"}}}, "cveMetadata": {"cveId": "CVE-2022-49963", "state": "PUBLISHED", "dateUpdated": "2026-10-15T21:31:17.741Z", "dateReserved": "2025-06-18T10:57:27.384Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2025-06-18T11:00:24.021Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

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With an object > 8M we therefore aren't properly\n copying the pages. And then with an object > 64M we trigger the\n GEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER).\n\nSo it looks like our copy handling for any object > 8M (which is our\nCHUNK_SZ) is currently broken on DG2.\n\nTestcase: igt@gem_lmem_swapping\n(cherry picked from commit 8676145eb2f53a9940ff70910caf0125bd8a4bc2)"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/i915/ttm: correcci\u00f3n del manejo de CCS Crucible + Mesa reciente parece a veces afectar: GEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER) Y parece que tambi\u00e9n podemos activar esto con gem_lmem_swapping, si modificamos la prueba para usar tama\u00f1os de objeto ligeramente mayores. Mirando m\u00e1s de cerca, parece que tenemos los siguientes problemas en migration_copy(): - Estamos usando un entero simple en varios lugares, que podemos desbordar f\u00e1cilmente con un objeto grande. - Pasamos el tama\u00f1o completo del objeto (cuando el src es lmem) a emit_pte() y luego intentamos copiarlo, lo cual no funciona, ya que solo tenemos unas pocas ventanas de tama\u00f1o fijo en las que mapear las p\u00e1ginas y realizar la copia. Con un objeto > 8M, por lo tanto, no estamos copiando correctamente las p\u00e1ginas. Y luego, con un objeto > 64M, activamos GEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER). Por lo tanto, parece que nuestra gesti\u00f3n de copias para cualquier objeto > 8M (que es nuestro CHUNK_SZ) est\u00e1 actualmente inactiva en DG2. Caso de prueba: igt@gem_lmem_swapping (seleccionado de el commit 8676145eb2f53a9940ff70910caf0125bd8a4bc2)"}], "id": "CVE-2022-49963", "lastModified": "2026-10-15T22:17:26.260", "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-2022-49963", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:29:52.414458Z", "version": "2.0.3"}}]}, "published": "2025-06-18T11:15:23.570", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/8d905254162965c8e6be697d82c7dbf5d08f574d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/97434cb55bd884bd268626ec41489f79b261b2d4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: drm/i915/ttm: fix CCS handling", "id": "2373482", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373482"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/i915/ttm: fix CCS handling\nCrucible + recent Mesa seems to sometimes hit:\nGEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER)\nAnd it looks like we can also trigger this with gem_lmem_swapping, if we\nmodify the test to use slightly larger object sizes.\nLooking closer it looks like we have the following issues in\nmigrate_copy():\n- We are using plain integer in various places, which we can easily\noverflow with a large object.\n- We pass the entire object size (when the src is lmem) into\nemit_pte() and then try to copy it, which doesn't work, since we\nonly have a few fixed sized windows in which to map the pages and\nperform the copy. With an object > 8M we therefore aren't properly\ncopying the pages. And then with an object > 64M we trigger the\nGEM_BUG_ON(num_ccs_blks > NUM_CCS_BLKS_PER_XFER).\nSo it looks like our copy handling for any object > 8M (which is our\nCHUNK_SZ) is currently broken on DG2.\nTestcase: igt@gem_lmem_swapping\n(cherry picked from commit 8676145eb2f53a9940ff70910caf0125bd8a4bc2)"], "name": "CVE-2022-49963", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"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": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49963\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49963\nhttps://lore.kernel.org/linux-cve-announce/2025061814-CVE-2022-49963-1a09@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T08:45:30.198541+00:00", "updated": "2025-06-23T08:45:30.198592+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}