CVE-2025-37813
Description
In the Linux kernel, the following vulnerability has been resolved: usb: xhci: Fix invalid pointer dereference in Etron workaround This check is performed before prepare_transfer() and prepare_ring(), so enqueue can already point at the final link TRB of a segment. And indeed it will, some 0.4% of times this code is called. Then enqueue + 1 is an invalid pointer. It will crash the kernel right away or load some junk which may look like a link TRB and cause the real link TRB to be replaced with a NOOP. This wouldn't end well. Use a functionally equivalent test which doesn't dereference the pointer and always gives correct result. Something has crashed my machine twice in recent days while playing with an Etron HC, and a control transfer stress test ran for confirmation has just crashed it again. The same test passes with this patch applied.
How to fix
- linux linux_kernel6.6.89, 6.12, 6.12.26, 6.14.5 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 6.6.66 ≤ v < 6.6.89, 6.11.11 ≤ v < 6.12, 6.12.2 ≤ v < 6.12.26, 6.13 ≤ v < 6.14.5, 6.15 | 6.6.89, 6.12, 6.12.26, 6.14.5 |
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