drm/vmwgfx: drop dma_buf reference on foreign-fd prime import (CVE-2026-80888) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-80888

drm/vmwgfx: drop dma_buf reference on foreign-fd prime import

Answer in brief

CVE-2026-80888 records a Unknown severity vulnerability in drm/vmwgfx: drop dma_buf reference on foreign-fd prime import. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 4, 2026Updated Sep 4, 2026Source checked Sep 4, 2026First seen by HOL Sep 4, 2026Material review Sep 4, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=65981f7681abdf92b25942222b629b9c512d0705 <619c3cfa88e09603a13d918f754808db2dda7057 \|\| >=65981f7681abdf92b25942222b629b9c512d0705 <c1c22fca0a0896a452a7cb92422d67babd65b4be \|\| >=65981f7681abdf92b25942222b629b9c512d0705 <a1e972fa94c3a8069e022c67b9d97c7aa7b05293 \|\| >=65981f7681abdf92b25942222b629b9c512d0705 <a8434b145b1e467940334c58c00af241e9494c5f \|\| >=65981f7681abdf92b25942222b629b9c512d0705 <4df39eb99bb47d1f24d1952c23b21b10988356bf \|\| >=65981f7681abdf92b25942222b629b9c512d0705 <f739416dc555fa205a785e5135d73fa39b26f35d	619c3cfa88e09603a13d918f754808db2dda7057, c1c22fca0a0896a452a7cb92422d67babd65b4be, a1e972fa94c3a8069e022c67b9d97c7aa7b05293, a8434b145b1e467940334c58c00af241e9494c5f, 4df39eb99bb47d1f24d1952c23b21b10988356bf, f739416dc555fa205a785e5135d73fa39b26f35d
Linux/Linuxgeneric	3.13	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 619c3cfa88e09603a13d918f754808db2dda7057 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 4, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 4, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: drm/vmwgfx: drop dma_buf reference on foreign-fd prime import ttm_prime_fd_to_handle() returns -ENOSYS when the imported fd's dma_buf->ops do not match the ttm_object_device's ops, but does so without releasing the reference acquired by dma_buf_get(). Any unprivileged renderD client passing a non-vmwgfx prime fd through the DRM_VMW_GB_SURFACE_REF{,_EXT} path leaks one dma_buf reference per call and indefinitely pins the foreign exporter's GEM resources. Funnel the error path through the existing dma_buf_put() so the reference is always dropped.

Quoted source text, attributed separately from HOL analysis.