{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-80702", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-26T14:34:25.786Z", "datePublished": "2026-08-28T06:53:05.253Z", "dateUpdated": "2026-10-16T19:26:34.045Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-29T06:22:22.050Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size\n\nTwo sites in vmwgfx_resource.c assign boolean literals to\nres->guest_memory_size, which is an unsigned long allocation-size\nfield; the intended target is the adjacent res->guest_memory_dirty\nbitfield. After the assignments the field holds 0 or 1 instead of\nthe resource's MOB allocation size:\n\n - vmw_resource_release() writes 0 (false), and\n - vmw_resource_unbind_list() writes 1 (true).\n\nSubsequent revalidation paths read guest_memory_size when computing\nthe dirty page range (vmw_bo_dirty_transfer_to_res()) and the buffer\nallocation size (vmw_resource_buf_alloc()), producing zero-length\nwalks or wrap-around ranges that read or write past the MOB bitmap.\nThe dirty-tracking intent of the original code (mark the resource as\ndirtied since the last sync) is also lost, since guest_memory_dirty\nis never updated.\n\nRename both assignments to guest_memory_dirty." } ], "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 - Reachable only via local DRM ioctls on the vmwgfx render node (surface/context create-unref, DRM_VMW_EXECBUF, synccpu); vmw_resource_unbind_list runs from vmw_bo_move_notify during MOB eviction, not from any network or physical bus.\nAC:L - An unprivileged attacker controls the full GPU resource lifecycle and can force MOB moves plus subsequent revalidation (execbuf, memory pressure, destroy paths) to clobber guest_memory_size to 0/1 without races or victim-dependent heap layout.\nPR:L - Entry ioctls use DRM_RENDER_ALLOW, so any local user with access to /dev/dri/renderD* on a VMware SVGA guest can trigger vmw_resource_release or vmw_resource_unbind_list and the follow-on validate/dirty paths without init-namespace root.\nUI:N - Exploitation requires only the attacker opening the DRM render device and issuing crafted GPU resource operations; no additional actions by another user or administrator are needed.\nS:U - The bug corrupts guest-kernel vmwgfx MOB dirty-tracking and heap metadata during resource revalidation; impact is confined to the guest kernel security domain and does not directly cross a VM/host or IOMMU boundary.\nC:H - Clobbering guest_memory_size to 0 or 1 breaks dirty page-range math in vmw_bo_dirty_transfer_to_res and vmw_resource_buf_alloc, producing zero-length or wrap-around walks that read past the MOB dirty bitmap and adjacent kernel heap memory.\nI:H - The same corrupted size drives out-of-bounds bitmap_clear and dirty_sync operations past the MOB bitmap and undersized reallocations, yielding a kernel heap write primitive that can be leveraged for guest privilege escalation.\nA:H - Out-of-bounds MOB bitmap access and mis-sized buffer reallocation during revalidation after unbind or release can kernel-oops or panic the guest, providing a reliable denial-of-service against the VM." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/vmwgfx/vmwgfx_resource.c" ], "versions": [ { "version": "668b206601c5f5063e03b76784a0d3024fa2b249", "lessThan": "21bbe38faee4a195d33a93e3908e307807f7745d", "status": "affected", "versionType": "git" }, { "version": "668b206601c5f5063e03b76784a0d3024fa2b249", "lessThan": "9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6", "status": "affected", "versionType": "git" }, { "version": "668b206601c5f5063e03b76784a0d3024fa2b249", "lessThan": "282f261cb035e5f01a486f76d356b7e9dbfba73f", "status": "affected", "versionType": "git" }, { "version": "668b206601c5f5063e03b76784a0d3024fa2b249", "lessThan": "3b2bb16a5b622867140d69925db411ac8ecb3b2b", "status": "affected", "versionType": "git" }, { "version": "668b206601c5f5063e03b76784a0d3024fa2b249", "lessThan": "83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa", "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/vmwgfx/vmwgfx_resource.c" ], "versions": [ { "version": "6.4", "status": "affected" }, { "version": "0", "lessThan": "6.4", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "6.4", "versionEndExcluding": "6.6.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.4", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/21bbe38faee4a195d33a93e3908e307807f7745d" }, { "url": "https://git.kernel.org/stable/c/9d6cbb76fe9cd760351f6b0b20f1bf788eab8fa6" }, { "url": "https://git.kernel.org/stable/c/282f261cb035e5f01a486f76d356b7e9dbfba73f" }, { "url": "https://git.kernel.org/stable/c/3b2bb16a5b622867140d69925db411ac8ecb3b2b" }, { "url": "https://git.kernel.org/stable/c/83195b778f2d109a3a4f3ffaba4dce7e4cdb58aa" } ], "title": "drm/vmwgfx: fix guest_memory_dirty bitfield clobbered as size", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-80702", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:20:19.394776Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:34.045Z" } } ] } }