{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74444", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.898Z", "datePublished": "2026-08-15T12:26:51.443Z", "dateUpdated": "2026-08-19T16:36:38.535Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:36:38.535Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: validate DRAW_PRIMITIVES header size before division\n\nvmw_cmd_draw() computes\n\n\tmaxnum = (header->size - sizeof(cmd->body)) / sizeof(*decl);\n\nwhere header->size is u32 and is taken straight from the user-supplied\ncommand stream. When header->size is less than sizeof(cmd->body) the\nunsigned subtraction wraps to nearly 4 GiB, producing a huge maxnum.\nAny user-controlled cmd->body.numVertexDecls then passes the bound and\nthe loop dereferences decl[i] far past the end of the kernel command\nbounce buffer, producing an out-of-bounds read of kernel memory.\n\nReject undersized headers up front." } ], "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 only through the local DRM_IOCTL_VMW_EXECBUF ioctl (vmw_execbuf_ioctl -> vmw_execbuf_process -> vmw_cmd_check_all -> vmw_cmd_draw); it is not reachable from network, adjacent wireless, or physical buses.\nAC:L - An attacker fully controls the user command stream and can set header->size below sizeof(cmd->body) to underflow maxnum and bypass numVertexDecls bounds; no races or victim-dependent timing are required.\nPR:L - VMW_EXECBUF is registered with DRM_RENDER_ALLOW, so any local process with access to the vmwgfx render node (/dev/dri/renderD*) and a user-created 3D context can submit the malicious DRAW_PRIMITIVES command without real root.\nUI:N - Exploitation requires only the attacker opening the render device and issuing crafted execbuf ioctls; no additional actions by another user or administrator are needed.\nS:U - Impact is confined to the guest kernel address space running vmwgfx (VMware SVGA virtual GPU); successful exploitation yields guest-kernel memory disclosure/corruption and privilege escalation, not a direct hypervisor/host escape.\nC:H - Unsigned underflow makes maxnum enormous, so the vertex-declaration loop dereferences decl[i] far beyond the vmalloc command bounce buffer and reads adjacent kernel heap memory (e.g., decl->array.surfaceId) into validation paths.\nI:H - Beyond disclosure, leaked/adjacent surfaceId values can satisfy vmw_user_resource_lookup_handle and vmw_resource_relocations_apply then writes resource IDs to offsets past the bounce buffer, giving an out-of-bounds kernel write primitive.\nA:H - Setting a large numVertexDecls after the bound bypass can walk far past the vmalloc allocation and fault on unmapped pages, and extensive heap corruption from relocation writes can also trigger kernel oops/panic." } ] } ], "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_execbuf.c" ], "versions": [ { "version": "7a73ba7469cbea631050094fd14f73acebb97cf9", "lessThan": "b89ca4bba820f79dde52af15ee139fe6e8bbc314", "status": "affected", "versionType": "git" }, { "version": "7a73ba7469cbea631050094fd14f73acebb97cf9", "lessThan": "bef30317fcb4c838a37bceb2fc76256eb6b975c1", "status": "affected", "versionType": "git" }, { "version": "7a73ba7469cbea631050094fd14f73acebb97cf9", "lessThan": "112c6ff29a56f3a22db4d5af869697aa07035ad6", "status": "affected", "versionType": "git" }, { "version": "7a73ba7469cbea631050094fd14f73acebb97cf9", "lessThan": "2666cddf0dd218aa9bd1f99db688d1b532eac21a", "status": "affected", "versionType": "git" }, { "version": "7a73ba7469cbea631050094fd14f73acebb97cf9", "lessThan": "fc0c02f510e41650df3479f96e257acf87d8a20a", "status": "affected", "versionType": "git" }, { "version": "7a73ba7469cbea631050094fd14f73acebb97cf9", "lessThan": "dc0be7662b7b0ce28cb5eea864737793ed7b9e70", "status": "affected", "versionType": "git" }, { "version": "7a73ba7469cbea631050094fd14f73acebb97cf9", "lessThan": "c77cf8edae2bd3a1599115301cc7c98d0c78e731", "status": "affected", "versionType": "git" }, { "version": "7a73ba7469cbea631050094fd14f73acebb97cf9", "lessThan": "85891d174707d8bddcec7a888fb4e1d17def34f3", "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_execbuf.c" ], "versions": [ { "version": "2.6.33", "status": "affected" }, { "version": "0", "lessThan": "2.6.33", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "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": "2.6.33", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "6.6.151" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b89ca4bba820f79dde52af15ee139fe6e8bbc314" }, { "url": "https://git.kernel.org/stable/c/bef30317fcb4c838a37bceb2fc76256eb6b975c1" }, { "url": "https://git.kernel.org/stable/c/112c6ff29a56f3a22db4d5af869697aa07035ad6" }, { "url": "https://git.kernel.org/stable/c/2666cddf0dd218aa9bd1f99db688d1b532eac21a" }, { "url": "https://git.kernel.org/stable/c/fc0c02f510e41650df3479f96e257acf87d8a20a" }, { "url": "https://git.kernel.org/stable/c/dc0be7662b7b0ce28cb5eea864737793ed7b9e70" }, { "url": "https://git.kernel.org/stable/c/c77cf8edae2bd3a1599115301cc7c98d0c78e731" }, { "url": "https://git.kernel.org/stable/c/85891d174707d8bddcec7a888fb4e1d17def34f3" } ], "title": "drm/vmwgfx: validate DRAW_PRIMITIVES header size before division", "x_generator": { "engine": "bippy-1.2.0" } } } }