In the Linux kernel, the following vulnerability has been resolved:
drm/vmwgfx: bound DMA command body size against suffix pointer
vmw_cmd_dma() locates the DMA suffix at
(unsigned long) &cmd->body + header->size - sizeof(*suffix)
without checking that header->size is large enough to contain both cmd->body and the suffix. An undersized header makes the suffix pointer underflow back into the previous command in the bounce buffer. The verifier later writes suffix->maximumOffset, clobbering verified fields of an already-relocated earlier command -- a TOCTOU on the device-visible command stream that lets one command rewrite another's GMR id, surface id, or other authenticated fields.
Reject the command if the body is too small for the suffix to fit.
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12-headersUpgrade perf6.12-debuginfoUpgrade kernel-livepatch-6.12.103-127.188Upgrade python3-perf6.12-debuginfoUpgrade kernel6.12-tools-debuginfoUpgrade kernel6.12-develUpgrade kernel6.12Upgrade kernel6.12-debuginfo-common-aarch64Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-modules-extra-commonUpgrade bpftool6.12Upgrade python3-perf6.12Upgrade kernel6.12-debuginfoUpgrade perf6.12Upgrade kernel6.12-modules-extraUpgrade kernel6.12-toolsUpgrade bpftool6.12-debuginfoUpgrade kernel6.12-tools-devel | Sep 1, 2026 | Aug 15, 2026 |
| Debian | — | Upgrade linux | Aug 26, 2026 | Aug 26, 2026 |
| Redhat_linux | — | No solution exists | Aug 24, 2026 | Aug 15, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Aug 21, 2026 | Aug 15, 2026 |
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