CVE-2026-93121: high-severity vulnerability in Linux
usb: gadget: f_fs: Fix fence cleanup in ffs_dmabuf_transfer() error paths
Published · Updated
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7epss 0.2%
exploitation probability
0.2%top 96% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Affected products
Linux · LinuxRelated CVEs — Linux
In the same product, most dangerous first.
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