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CVE-2026-74443: drm/vmwgfx: bound DMA command body size against suffix pointer

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-15 · updated 2026-10-16

Description

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.

Affected products

• Linux kernel: 2.6.33 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/036e16ada95389bdc30f41068af04c1d0872fad0
• https://git.kernel.org/stable/c/7e40e6120fb232a10b543ffd994e5c6d8f3a2cc6
• https://git.kernel.org/stable/c/9759da60e38d7b9db44dc92713e4e0391883d221
• https://git.kernel.org/stable/c/a4a37080a5ac777b59306cfcdf854cc05d7604d4
• https://git.kernel.org/stable/c/d5d7ada4e1296b00d89fe82b2ca850cc7809d6f7
• https://git.kernel.org/stable/c/eb20f418933bea53375843b27b4022c1810be63b
• https://git.kernel.org/stable/c/f4f1db96bfd68b81053693ba53405b6f510ac16c
• https://git.kernel.org/stable/c/fcd1e56e7816b31a1050ccc67df722b20f6bb15d

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