{"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"}}}}