CVE-2026-93121

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux7b07a2a7ca02a20124b552be96c5a56910795488 < be539138d9a187af3b884525a395db10797c64f1affected
LinuxLinux7b07a2a7ca02a20124b552be96c5a56910795488 < 5fd8baacc7dc477df9cac61b45491840247a9b1eaffected
LinuxLinux7b07a2a7ca02a20124b552be96c5a56910795488 < 58952c83dfe6ea3294a74734d2d1018c1120779aaffected
LinuxLinux7b07a2a7ca02a20124b552be96c5a56910795488 < 621707dc67c9846fd876d7579ec951d92aa033f1affected
LinuxLinux6.9affected
LinuxLinux0 < 6.9unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References