138 lines
7.4 KiB
JSON
138 lines
7.4 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-80582",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-26T14:34:25.769Z",
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"datePublished": "2026-08-26T14:37:39.113Z",
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"dateUpdated": "2026-08-27T05:02:02.758Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-27T05:02:02.758Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/shmem_helper: Check VMA boundaries for PMD mappings\n\nIn the ->huge_fault handler do not install a PMD huge page\nmapping if the huge page exceeds the boundaries of the VMA.\n\nAll other ->huge_fault handlers have similar checks and the\nresulting mapping will trigger a VM_BUG_ON_VMA() if it ever\nreaches copy_pmd_range()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - Reachable via local mmap/page-fault on DRM GEM shmem buffers (drm_gem_mmap -> drm_gem_shmem_any_fault -> try_insert_pfn PMD path), used by virtio-gpu, panfrost, lima, v3d, panthor, and other GPU/accelerator drivers on phones, VMs, and desktops.\nAC:L - An attacker controls GEM buffer size, mmap length, fault addresses, and follow-on fork/mprotect; no race or rare layout is required beyond creating a non-PMD-aligned mapping near a VMA end so a 2MB PMD install overruns the VMA.\nPR:L - Only standard local GPU access is needed (open /dev/dri/renderD* or card*, DRM GEM create/mmap ioctls); no CAP_SYS_ADMIN or init-namespace root, matching unprivileged desktop render-group users, Android GPU apps, and cloud/VM GPU workloads.\nUI:N - Exploitation is fully attacker-driven through their own DRM client (create buffer, mmap, touch pages, fork); no separate victim action such as opening a file or mounting a filesystem is required.\nS:U - Impact stays within the kernel/GPU process security boundary (local memory corruption and kernel panic); it does not cross VM/host, IOMMU, or sandbox authority boundaries.\nC:H - Without the VMA boundary check, a 2MB PMD PFNMAP can cover virtual/physical pages beyond the GEM object and VMA, creating out-of-bounds read primitives from adjacent mapped memory before copy_pmd_range() trips VM_BUG_ON_VMA().\nI:H - The same oversized PMD mapping installs writable PFNMAP entries beyond the allocated buffer, enabling out-of-bounds writes and corrupt page tables exploitable for control-flow or data tampering, not merely a clean fault.\nA:H - The invalid PMD eventually hits VM_BUG_ON_VMA() in copy_pmd_range() or __split_huge_pmd() (e.g., fork of the mapping), producing a kernel BUG/oops and panic as demonstrated in related drm/shmem_helper THP testing."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/drm_gem_shmem_helper.c"
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],
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"versions": [
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{
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"version": "fc3bbf34e643faa8678aabdc3810c60109f3435a",
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"lessThan": "12803e89a1e593fd1e784dfe7453f5e392ccaff2",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "fc3bbf34e643faa8678aabdc3810c60109f3435a",
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"lessThan": "617bbd08714857c1613d7c550d43a9092ec0fb97",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/drm_gem_shmem_helper.c"
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],
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"versions": [
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{
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"version": "7.0",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "7.0",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.10",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.0",
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"versionEndExcluding": "7.1.10"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.0",
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"versionEndExcluding": "7.2"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/12803e89a1e593fd1e784dfe7453f5e392ccaff2"
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},
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{
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"url": "https://git.kernel.org/stable/c/617bbd08714857c1613d7c550d43a9092ec0fb97"
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}
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],
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"title": "drm/shmem_helper: Check VMA boundaries for PMD mappings",
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