{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80700","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-26T14:34:25.786Z","datePublished":"2026-08-28T06:53:04.050Z","dateUpdated":"2026-08-29T06:22:20.794Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-29T06:22:20.794Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: validate external BO copy bounds for both stride paths\n\nvmw_external_bo_copy() trusts caller-supplied offsets, strides, and\nheights and operates on imported dma-buf vmaps:\n\n  - The equal-stride memcpy() bound was clamped after subtracting the\n    offsets from dst_size and src_size; an offset larger than the BO\n    size wraps the unsigned subtraction to a huge value and the\n    resulting memcpy() runs off the end of the vmap.  dst_stride *\n    height is also a u32 multiplication that can overflow.\n  - The non-equal-stride row-by-row path had no bound at all.  The\n    loop touches bytes through offset + (height - 1) * stride +\n    width_in_bytes, with only a WARN_ON(dst_stride < width_in_bytes),\n    and could likewise step past the end of either mapping.\n\nThe offsets and strides are derived from STDU/SOU plane state, so a\nconfigured CRTC submitting a crafted atomic commit on an imported\nframebuffer can reach this path.\n\nValidate the exact row-copy endpoint against each BO's size up front\nusing check_mul_overflow() and check_add_overflow().  Use the bulk\nmemcpy() path only when width_in_bytes covers the whole stride;\notherwise copy one row at a time so partial-row updates near the bottom\nof a framebuffer remain valid.  Also reject zero strides and stride <\nwidth_in_bytes, both of which the row-by-row path cannot represent\nsafely."}],"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 flaw is reached only via local DRM KMS ioctls on /dev/dri/card0: DRM_IOCTL_MODE_ATOMIC drives STDU/SOU plane updates that call vmw_bo_cpu_blit() -> vmw_external_bo_copy(); vmwgfx is not exposed through any network, adjacent-radio, or physical-bus interface.\nAC:L - An attacker with DRM master fully controls atomic plane state, damage clips, pitches, and prime-imported framebuffer geometry that derive dst/src offsets, strides, and height; crafted values reliably trigger unsigned wrap or unbounded row copies without races or victim-dependent layout.\nPR:L - DRM_IOCTL_MODE_ATOMIC is gated by DRM_MASTER, not real root; on VMware guests and VDI desktops the logged-in session user holding master (typical video/render group access) can prime-import a dma-buf, configure a CRTC, and submit the malicious atomic commit.\nUI:N - Exploitation requires only the attacker opening the DRM device and issuing crafted atomic commits with an imported framebuffer; no actions by another user such as mounting filesystems or opening files are needed.\nS:U - Out-of-bounds memcpy corrupts adjacent guest-kernel memory around imported dma-buf vmaps and internal display BO mappings, enabling guest-kernel privilege escalation; impact stays within the guest kernel security domain and does not directly cross a VM/host or IOMMU boundary.\nC:H - The bug performs unchecked memcpy from attacker-influenced source mappings past buffer ends (equal-stride unsigned underflow and unbounded row-by-row copies), yielding an out-of-bounds kernel read primitive that can disclose adjacent heap/vmalloc data including kernel pointers.\nI:H - The same unchecked copies write past the end of destination vmaps, providing an out-of-bounds kernel write primitive that can corrupt adjacent objects and be developed into arbitrary memory modification or code execution.\nA:H - Large out-of-bounds memcpy operations can immediately corrupt critical kernel structures or touch unmapped pages, causing kernel oops/panic; the atomic-commit trigger can be repeated to deny availability after reboot."}]}],"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_blit.c"],"versions":[{"version":"9a9716bbbf3dd6b6cbefba3abcc89af8b72631f4","lessThan":"4e0f669e2951b742239c6fe847fcc406fe78748d","status":"affected","versionType":"git"},{"version":"50f1199250912568606b3778dc56646c10cb7b04","lessThan":"e7b25a6011781ebfdbc458552cae6d4156732771","status":"affected","versionType":"git"},{"version":"50f1199250912568606b3778dc56646c10cb7b04","lessThan":"042ca38779554687fc32b66a28328e0d9a36c58f","status":"affected","versionType":"git"},{"version":"50f1199250912568606b3778dc56646c10cb7b04","lessThan":"5e4a2d15637a906cbd9bc98e0bf969f5f713e344","status":"affected","versionType":"git"},{"version":"50f1199250912568606b3778dc56646c10cb7b04","lessThan":"706c93c5813caabbb0d0a576c017d15aeec2c113","status":"affected","versionType":"git"},{"version":"5c12391ee1ab59cb2f3be3f1f5e6d0fc0c2dc854","status":"affected","versionType":"git"},{"version":"6.6.49","lessThan":"6.6.151","status":"affected","versionType":"semver"},{"version":"6.10.8","lessThan":"6.11","status":"affected","versionType":"semver"}]},{"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_blit.c"],"versions":[{"version":"6.11","status":"affected"},{"version":"0","lessThan":"6.11","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":"6.6.49","versionEndExcluding":"6.6.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.12.103"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.10.8"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/4e0f669e2951b742239c6fe847fcc406fe78748d"},{"url":"https://git.kernel.org/stable/c/e7b25a6011781ebfdbc458552cae6d4156732771"},{"url":"https://git.kernel.org/stable/c/042ca38779554687fc32b66a28328e0d9a36c58f"},{"url":"https://git.kernel.org/stable/c/5e4a2d15637a906cbd9bc98e0bf969f5f713e344"},{"url":"https://git.kernel.org/stable/c/706c93c5813caabbb0d0a576c017d15aeec2c113"}],"title":"drm/vmwgfx: validate external BO copy bounds for both stride paths","x_generator":{"engine":"bippy-1.2.0"}}}}