CVE-2026-68446

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bug is reached through the DRM_IOCTL_VMW_GB_SURFACE_CREATE/_EXT ioctls on the vmwgfx render node (/dev/dri/renderD128), i.e. local access to the device file on a VMware guest; no network or physical access is involved.\nAC:L - The attacker directly supplies array_size, mip_levels and base_size in a single ioctl and can deterministically choose values that wrap the 32-bit size/subresource computations; no race or uncontrolled precondition is required.\nPR:L - Both ioctls are registered DRM_RENDER_ALLOW, so an unprivileged local user (or containerized workload) holding the normal render-node permissions can call them without DRM master, root, or any capability.\nUI:N - Exploitation is entirely attacker-driven via ioctl calls on an already-open render node; no action by another user or administrator is needed.\nS:U - The unvalidated value corrupts guest kernel memory and device-command state within the same kernel security authority; no VM/IOMMU or sandbox boundary is crossed by the flaw itself.\nC:H - The wrapped res->guest_memory_size makes the backing buffer far smaller than the surface the host device is told to service, and the undersized dirty->boxes array is indexed out of bounds, giving out-of-bounds reads of adjacent kernel heap data that can be leaked back through surface contents.\nI:H - The u32 overflows in vmw_surface_get_serialized_size() and num_layers*num_mip yield an undersized backing BO and dirty-tracking array, producing controlled out-of-bounds heap writes (SVGA3dBox data and device DMA past the buffer) usable for heap corruption and privilege escalation.\nA:H - Out-of-bounds writes past kvzalloc'd dirty trackers and BO-sized mismatches reliably corrupt kernel heap metadata, causing oopses/panics; huge array_size values also drive enormous allocations, so a local user can crash the guest kernel."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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surface the host device is told to service, and the undersized dirty->boxes array is indexed out of bounds, giving out-of-bounds reads of adjacent kernel heap data that can be leaked back through surface contents.\nI:H - The u32 overflows in vmw_surface_get_serialized_size() and num_layers*num_mip yield an undersized backing BO and dirty-tracking array, producing controlled out-of-bounds heap writes (SVGA3dBox data and device DMA past the buffer) usable for heap corruption and privilege escalation.\nA:H - Out-of-bounds writes past kvzalloc'd dirty trackers and BO-sized mismatches reliably corrupt kernel heap metadata, causing oopses/panics; huge array_size values also drive enormous allocations, so a local user can crash the guest kernel."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "504901dbb0b565fcbe466b0c56f3131586df5afd", "lessThan": 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should be validated against specific\nlimits depending on which Shader Model (SM) is available."}], "id": "CVE-2026-68446", "lastModified": "2026-10-19T22:17:19.480", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-68446", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:49:03.361891Z", "version": "2.0.3"}}]}, "published": "2026-08-12T00:17:44.970", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0403cec2aff8037bc246cf9a0831eb169ddcd9df"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5ff94e1279176b539d451e3e754fdcbd1a8d520a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6910ccaf41678f7761ba2e57d72b77d056320b4d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/71779fe8bf403a9b3e28dc59229fa556db32d35d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a4f55260f7f7d4dc4d0ee55063dfb0c457b77991"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aded8463466ede7a7fbd1bbf821756c67c83e89b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b1379f0c42b88cb60b9f3757eb5d1e73ad460ed8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e949adf2d42678fb391a41db277e2fcb12090566"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-20"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: drm/vmwgfx: Validate vmw_surface_metadata::array_size", "id": "2514442", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2514442"}, "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"}, "cwe": "CWE-805", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ndrm/vmwgfx: Validate vmw_surface_metadata::array_size\nThis field comes from userspace and should be validated against specific\nlimits depending on which Shader Model (SM) is available.", "A flaw was found in the `drm/vmwgfx` component of the Linux kernel. This vulnerability arises from insufficient validation of the `vmw_surface_metadata::array_size` field, which is supplied by userspace. An attacker could exploit this by providing a malformed `array_size` value, potentially leading to unexpected system behavior or a denial of service (DoS)."], "name": "CVE-2026-68446", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "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": "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": "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"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-12T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68446\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68446\nhttps://lore.kernel.org/linux-cve-announce/2026081257-CVE-2026-68446-e066@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[504901dbb0b565fcbe466b0c56f3131586df5afd,5ff94e1279176b539d451e3e754fdcbd1a8d520a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[504901dbb0b565fcbe466b0c56f3131586df5afd,71779fe8bf403a9b3e28dc59229fa556db32d35d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[504901dbb0b565fcbe466b0c56f3131586df5afd,b1379f0c42b88cb60b9f3757eb5d1e73ad460ed8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[504901dbb0b565fcbe466b0c56f3131586df5afd,6910ccaf41678f7761ba2e57d72b77d056320b4d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[504901dbb0b565fcbe466b0c56f3131586df5afd,a4f55260f7f7d4dc4d0ee55063dfb0c457b77991)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.7"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.7)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.148,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.101,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-12T15:15:02.674509+00:00", "updated": "2026-08-14T01:00:05.199072+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-20", "CWE-129", "CWE-805"]}