{"api_version":"1","generated_at":"2026-08-22T05:34:11+00:00","cve":"CVE-2026-68474","urls":{"html":"https://cve.report/CVE-2026-68474","api":"https://cve.report/api/cve/CVE-2026-68474.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-68474","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-68474"},"summary":{"title":"powerpc/spufs: fix out-of-bounds access in spufs_mem_mmap_access()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/spufs: fix out-of-bounds access in spufs_mem_mmap_access()\n\nspufs_mem_mmap_access() computes the local store offset as\naddress - vma->vm_start, but bounds-checks it against vma->vm_end\ninstead of the local store size. On 64-bit, offset is always well\nbelow vma->vm_end, so the clamp never fires and len stays unbounded\nagainst the LS_SIZE buffer returned by ctx->ops->get_ls().\n\nReject offsets at or beyond LS_SIZE and clamp len to the remaining\nspace, mirroring the guard already used by spufs_mem_mmap_fault() and\nspufs_ps_fault().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:20:34","updated_at":"2026-08-17 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the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/spufs: fix out-of-bounds access in spufs_mem_mmap_access()\n\nspufs_mem_mmap_access() computes the local store offset as\naddress - vma->vm_start, but bounds-checks it against vma->vm_end\ninstead of the local store size. On 64-bit, offset is always well\nbelow vma->vm_end, so the clamp never fires and len stays unbounded\nagainst the LS_SIZE buffer returned by ctx->ops->get_ls().\n\nReject offsets at or beyond LS_SIZE and clamp len to the remaining\nspace, mirroring the guard already used by spufs_mem_mmap_fault() and\nspufs_ps_fault()."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached only through local kernel interfaces (spu_create, mmap of spufs \"mem\", then /proc/self/mem or ptrace/GDB via access_remote_vm); there is no network, adjacent-radio, or physical-device attack path.\nAC:L - An attacker who can map spufs local store fully controls the VMA address and transfer length; the broken bounds check fails deterministically on 64-bit, so no races or victim-specific layout are required.\nPR:L - On Cell systems with spufs mounted, spu_create and the world-readable/writable mem node (0666) require only a local unprivileged account with write access to the spufs mount, not real init-namespace root or non-namespace capabilities.\nUI:N - Exploitation is self-contained: the attacker creates/maps their own SPU context and triggers the flaw through /proc/self/mem or debugging APIs without any separate victim action.\nS:U - Impact is kernel memory corruption and disclosure within the host kernel from a local user context; it does not cross a VM, container, or IOMMU security boundary to another authority.\nC:H - memcpy_fromio with an unclamped length reads well past the 256KB LS_SIZE buffer (vmalloc heap after lscsa or beyond the ioremap), enabling substantial out-of-bounds kernel memory disclosure.\nI:H - memcpy_toio with the same faulty bounds allows out-of-bounds writes past the local-store mapping, corrupting adjacent kernel memory and supporting further privilege escalation or code execution.\nA:H - Out-of-bounds MMIO/vmalloc access can provoke immediate kernel faults/oops/panics, and heap corruption from oversized writes can crash or hang the system during exploitation."}]}],"providerMetadata":{"dateUpdated":"2026-08-17T05:39:17.306Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/aa7aa8ba40c089762d821e3987aaae19e1f5705c"},{"url":"https://git.kernel.org/stable/c/d479a7711f8ff127946467b910d947bd971b94ed"},{"url":"https://git.kernel.org/stable/c/9d3569bfdceda69d5ffd5148901e57b69954d9ef"},{"url":"https://git.kernel.org/stable/c/d97a8f3668949a8a9d1f6202f8c53446f2d89aa7"},{"url":"https://git.kernel.org/stable/c/913feef74354c653f10ecd4631df7618a95c49c2"},{"url":"https://git.kernel.org/stable/c/3c1e92f75e11a11492b8cb901fceeb9f16ae6415"},{"url":"https://git.kernel.org/stable/c/4efa313b15925bdd864784865d6585174979294b"},{"url":"https://git.kernel.org/stable/c/47b87f469a35b5ffc81c16eee6b13a9b6c8d55c6"}],"title":"powerpc/spufs: fix out-of-bounds access in spufs_mem_mmap_access()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-68474","datePublished":"2026-08-15T05:51:30.918Z","dateReserved":"2026-07-30T09:28:09.396Z","dateUpdated":"2026-08-17T05:39:17.306Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:20:34","lastModifiedDate":"2026-08-17 06:17:56","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"68474","Ordinal":"1","Title":"powerpc/spufs: fix out-of-bounds access in spufs_mem_mmap_access","CVE":"CVE-2026-68474","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"68474","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/spufs: fix out-of-bounds access in spufs_mem_mmap_access()\n\nspufs_mem_mmap_access() computes the local store offset as\naddress - vma->vm_start, but bounds-checks it against vma->vm_end\ninstead of the local store size. On 64-bit, offset is always well\nbelow vma->vm_end, so the clamp never fires and len stays unbounded\nagainst the LS_SIZE buffer returned by ctx->ops->get_ls().\n\nReject offsets at or beyond LS_SIZE and clamp len to the remaining\nspace, mirroring the guard already used by spufs_mem_mmap_fault() and\nspufs_ps_fault().","Type":"Description","Title":"powerpc/spufs: fix out-of-bounds access in spufs_mem_mmap_access"}]}}}