CVE-2026-74443

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux4e4ddd47774313accc86b233d6ca2c6a9037a671 < 036e16ada95389bdc30f41068af04c1d0872fad0affected
LinuxLinux4e4ddd47774313accc86b233d6ca2c6a9037a671 < d5d7ada4e1296b00d89fe82b2ca850cc7809d6f7affected
LinuxLinux4e4ddd47774313accc86b233d6ca2c6a9037a671 < 7e40e6120fb232a10b543ffd994e5c6d8f3a2cc6affected
LinuxLinux4e4ddd47774313accc86b233d6ca2c6a9037a671 < 9759da60e38d7b9db44dc92713e4e0391883d221affected
LinuxLinux4e4ddd47774313accc86b233d6ca2c6a9037a671 < f4f1db96bfd68b81053693ba53405b6f510ac16caffected
LinuxLinux2.6.33affected
LinuxLinux0 < 2.6.33unaffected
LinuxLinux6.6.151 <= 6.6.*unaffected
LinuxLinux6.12.103 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2-rc6 <= *unaffected

Weaknesses

References