usb: gadget: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths (CVE-2026-93121) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-93121

usb: gadget: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths

Answer in brief

CVE-2026-93121 records a Unknown severity vulnerability in usb: gadget: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths. 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 17, 2026Updated Sep 17, 2026Source checked Sep 17, 2026First seen by HOL Sep 17, 2026Material review Sep 17, 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	>=7b07a2a7ca02a20124b552be96c5a56910795488 <be539138d9a187af3b884525a395db10797c64f1 \|\| >=7b07a2a7ca02a20124b552be96c5a56910795488 <5fd8baacc7dc477df9cac61b45491840247a9b1e \|\| >=7b07a2a7ca02a20124b552be96c5a56910795488 <58952c83dfe6ea3294a74734d2d1018c1120779a \|\| >=7b07a2a7ca02a20124b552be96c5a56910795488 <621707dc67c9846fd876d7579ec951d92aa033f1	be539138d9a187af3b884525a395db10797c64f1, 5fd8baacc7dc477df9cac61b45491840247a9b1e, 58952c83dfe6ea3294a74734d2d1018c1120779a, 621707dc67c9846fd876d7579ec951d92aa033f1
Linux/Linuxgeneric	6.9	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to be539138d9a187af3b884525a395db10797c64f1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 17, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths The error paths for endpoint-disabled (ESHUTDOWN) and request-allocation failure (ENOMEM) in ffs_dmabuf_transfer() jump to err_fence_put which calls dma_fence_put() on the fence. However, at that point the fence has only been kmalloc'd — dma_fence_init() has not been called yet, so the refcount and the fence ops are uninitialized. Calling dma_fence_put() on such an object leads to undefined behavior. Use kfree() instead, since the fence is just a plain allocation at this stage, and rename the label to err_fence_free to reflect the actual cleanup action.

Quoted source text, attributed separately from HOL analysis.