drm/vmwgfx: bound DMA command body size against suffix pointer
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 5 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 2.6.33 and later | 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, 7.2 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.33 and later Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, 7.2 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.151, 6.12.103, 6.18.44, 7.1.8, 7.2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-74443
- 2026-10-03 Alias added: GHSA-hrvm-q452-gmcq
- 2026-10-18 CISA SSVC decision points changed
References
Other 8
- https://git.kernel.org/stable/c/eb20f418933bea53375843b27b4022c1810be63b
- https://git.kernel.org/stable/c/fcd1e56e7816b31a1050ccc67df722b20f6bb15d
- https://git.kernel.org/stable/c/a4a37080a5ac777b59306cfcdf854cc05d7604d4
- https://git.kernel.org/stable/c/036e16ada95389bdc30f41068af04c1d0872fad0
- https://git.kernel.org/stable/c/d5d7ada4e1296b00d89fe82b2ca850cc7809d6f7
- https://git.kernel.org/stable/c/7e40e6120fb232a10b543ffd994e5c6d8f3a2cc6
- https://git.kernel.org/stable/c/9759da60e38d7b9db44dc92713e4e0391883d221
- https://git.kernel.org/stable/c/f4f1db96bfd68b81053693ba53405b6f510ac16c
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Sources
- CVE-2026-74443 · CVE Program
- CVE-2026-74443 · NVD
- FIRST EPSS
- GHSA-hrvm-q452-gmcq · GitHub Advisory Database · CC BY 4.0
- CVE-2026-74443 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences