Bug 2517089 (CVE-2026-74445)

Summary: CVE-2026-74445 kernel: drm/vmwgfx: reject DX_BIND_QUERY without a DX context
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's `drm/vmwgfx` component. A local attacker can trigger a null pointer dereference by sending a specially crafted command to the `vmw_cmd_dx_bind_query()` function. This can lead to a kernel crash, resulting in a Denial of Service (DoS) for the affected system.
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Description OSIDB Bzimport 2026-08-15 12:49:54 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/vmwgfx: reject DX_BIND_QUERY without a DX context

vmw_cmd_dx_bind_query() unconditionally dereferences
sw_context->dx_ctx_node->ctx.  Userspace can trigger a NULL pointer
dereference from any render-node fd by submitting an execbuf with
dx_context_handle == SVGA3D_INVALID_ID and a SVGA_3D_CMD_DX_BIND_QUERY
opcode in the command stream: dx_ctx_node is left NULL and the kernel
oopses on the assignment.  The same NULL is then re-read in
vmw_resources_reserve() via vmw_context_get_dx_query_mob().

All sibling DX handlers fail-close on a missing dx_ctx_node using
VMW_GET_CTX_NODE().  Use the same pattern here, returning -EINVAL up
front before any relocation state is published.
Comment 1 TEJ RATHI 2026-08-17 12:41:00 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081529-CVE-2026-74445-05de@gregkh/T