CVE-2026-74444
In the Linux kernel, the following vulnerability has been resolved:
drm/vmwgfx: validate DRAW_PRIMITIVES header size before division
vmw_cmd_draw() computes
maxnum = (header->size - sizeof(cmd->body)) / sizeof(*decl);
where header->size is u32 and is taken straight from the user-supplied
command stream. When header->size is less than sizeof(cmd->body) the
unsigned subtraction wraps to nearly 4 GiB, producing a huge maxnum.
Any user-controlled cmd->body.numVertexDecls then passes the bound and
the loop dereferences decl[i] far past the end of the kernel command
bounce buffer, producing an out-of-bounds read of kernel memory.
Reject undersized headers up front.
CSIRTS triage
- What
- Missing validation of DRAW_PRIMITIVES header size before division causes potential divide-by-zero.
- Who is affected
- Systems running affected Linux kernel versions with vmwgfx DRM driver enabled.
- Urgency
- Moderate; not yet exploited but high CVSS indicates elevated risk.
- Action
- Apply kernel patch validating header size or update to patched kernel version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.
Advisory coverage (3)
- unknownDSA-6466-1 linux - security updatedebian · 2026-08-25
- highCVE-2026-74444: In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: validate DRAW_…nvd · 2026-08-15
- highCVE-2026-74444: drm/vmwgfx: validate DRAW_PRIMITIVES header size before divisionmsrc · 2026-08-11
External references
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