{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74443", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.898Z", "datePublished": "2026-08-15T12:26:50.826Z", "dateUpdated": "2026-08-19T16:36:35.874Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:36:35.874Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: bound DMA command body size against suffix pointer\n\nvmw_cmd_dma() locates the DMA suffix at\n\n\t(unsigned long) &cmd->body + header->size - sizeof(*suffix)\n\nwithout checking that header->size is large enough to contain both\ncmd->body and the suffix. An undersized header makes the suffix\npointer underflow back into the previous command in the bounce\nbuffer. The verifier later writes suffix->maximumOffset, clobbering\nverified fields of an already-relocated earlier command -- a TOCTOU\non the device-visible command stream that lets one command rewrite\nanother's GMR id, surface id, or other authenticated fields.\n\nReject the command if the body is too small for the suffix to fit." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation requires issuing DRM_IOCTL_VMW_EXECBUF with a crafted SVGA command batch via /dev/dri/card* or /dev/dri/renderD*, the standard local DRM render-node path for the vmwgfx driver in VMware virtual machines.\nAC:L - The attacker fully controls execbuf command layout and can set an undersized SVGA_3D_CMD_SURFACE_DMA header->size so the suffix pointer underflows into the prior command; no races, rare configs, or victim-dependent heap layout are required.\nPR:L - VMW_EXECBUF is registered with DRM_RENDER_ALLOW, so any local user with access to the DRM render node (typically membership in the render/video group on VMware guests) can reach vmw_cmd_dma without real root in the init namespace.\nUI:N - No victim interaction is required beyond the attacker opening the DRM device and submitting a malicious execbuf ioctl; exploitation does not depend on another user mounting filesystems or performing other actions.\nS:C - The bug is a TOCTOU on the device-visible SVGA command stream: verifier writes clobber already-checked fields (GMR id, surface id, DMA bounds) in the bounce buffer before submission to the VMware virtual GPU, bypassing guest/host isolation enforced by command authentication.\nC:H - Rewriting authenticated GMR/surface identifiers or inflating maximumOffset can authorize SVGA surface DMA reads (including SVGA3D_READ_HOST_VRAM) beyond validated guest buffer bounds, yielding arbitrary guest memory disclosure and plausible host VRAM reads via the virtual device backend.\nI:H - Clobbering verified command fields lets a later command rewrite another's GMR id, surface id, or DMA limit so the hypervisor executes unauthorized SVGA3D_WRITE_HOST_VRAM or guest GMR DMA, enabling arbitrary memory write and code-execution primitives typical of kernel heap corruption.\nA:H - Corrupting the bounce-buffer command stream before FIFO submission can panic the guest kernel (invalid SVGA commands/resources) and enables repeatable denial of service; memory corruption in the verifier path is independently rated High per kernel CVSS guidance." } ] } ], "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": "4e4ddd47774313accc86b233d6ca2c6a9037a671", "lessThan": "eb20f418933bea53375843b27b4022c1810be63b", "status": "affected", "versionType": "git" }, { "version": "4e4ddd47774313accc86b233d6ca2c6a9037a671", "lessThan": "fcd1e56e7816b31a1050ccc67df722b20f6bb15d", "status": "affected", "versionType": "git" }, { "version": "4e4ddd47774313accc86b233d6ca2c6a9037a671", "lessThan": "a4a37080a5ac777b59306cfcdf854cc05d7604d4", "status": "affected", "versionType": "git" }, { "version": "4e4ddd47774313accc86b233d6ca2c6a9037a671", "lessThan": "036e16ada95389bdc30f41068af04c1d0872fad0", "status": "affected", "versionType": "git" }, { "version": "4e4ddd47774313accc86b233d6ca2c6a9037a671", "lessThan": "d5d7ada4e1296b00d89fe82b2ca850cc7809d6f7", "status": "affected", "versionType": "git" }, { "version": "4e4ddd47774313accc86b233d6ca2c6a9037a671", "lessThan": "7e40e6120fb232a10b543ffd994e5c6d8f3a2cc6", "status": "affected", "versionType": "git" }, { "version": "4e4ddd47774313accc86b233d6ca2c6a9037a671", "lessThan": "9759da60e38d7b9db44dc92713e4e0391883d221", "status": "affected", "versionType": "git" }, { "version": "4e4ddd47774313accc86b233d6ca2c6a9037a671", "lessThan": "f4f1db96bfd68b81053693ba53405b6f510ac16c", "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/eb20f418933bea53375843b27b4022c1810be63b" }, { "url": "https://git.kernel.org/stable/c/fcd1e56e7816b31a1050ccc67df722b20f6bb15d" }, { "url": "https://git.kernel.org/stable/c/a4a37080a5ac777b59306cfcdf854cc05d7604d4" }, { "url": "https://git.kernel.org/stable/c/036e16ada95389bdc30f41068af04c1d0872fad0" }, { "url": "https://git.kernel.org/stable/c/d5d7ada4e1296b00d89fe82b2ca850cc7809d6f7" }, { "url": "https://git.kernel.org/stable/c/7e40e6120fb232a10b543ffd994e5c6d8f3a2cc6" }, { "url": "https://git.kernel.org/stable/c/9759da60e38d7b9db44dc92713e4e0391883d221" }, { "url": "https://git.kernel.org/stable/c/f4f1db96bfd68b81053693ba53405b6f510ac16c" } ], "title": "drm/vmwgfx: bound DMA command body size against suffix pointer", "x_generator": { "engine": "bippy-1.2.0" } } } }