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CVE-2026-74443

HIGHCVSS 8.8/10EPSS 0.13%

Last modified

CVE-2026-74443 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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. EPSS estimates a 0.13% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
8.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS Probability
0.13%

2.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 4e4ddd47774313accc86b233d6ca2c6a9037a671, < eb20f418933bea53375843b27b4022c1810be63b; >= 4e4ddd47774313accc86b233d6ca2c6a9037a671, < fcd1e56e7816b31a1050ccc67df722b20f6bb15d; >= 4e4ddd47774313accc86b233d6ca2c6a9037a671, < a4a37080a5ac777b59306cfcdf854cc05d7604d4; >= 4e4ddd47774313accc86b233d6ca2c6a9037a671, < 036e16ada95389bdc30f41068af04c1d0872fad0; >= 4e4ddd47774313accc86b233d6ca2c6a9037a671, < d5d7ada4e1296b00d89fe82b2ca850cc7809d6f7; >= 4e4ddd47774313accc86b233d6ca2c6a9037a671, < 7e40e6120fb232a10b543ffd994e5c6d8f3a2cc6; >= 4e4ddd47774313accc86b233d6ca2c6a9037a671, < 9759da60e38d7b9db44dc92713e4e0391883d221; >= 4e4ddd47774313accc86b233d6ca2c6a9037a671, < f4f1db96bfd68b81053693ba53405b6f510ac16c
LinuxLinux2.6.33

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74443?
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.
How severe is CVE-2026-74443?
CVE-2026-74443 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.13% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74443?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST