CVE-2025-37813

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxfbc0a0c7718a6cb1dc5e0811a4f88a2b1deedfa1 < 142273a49f2c315eabdbdf5a71c15e479b75ca91affected
LinuxLinux9258c9ed32294ce3a4b58c9d92fc49ba030d35c9 < bce3055b08e303e28a8751f6073066f5c33a0744affected
LinuxLinux5e1c67abc9301d05130b7e267c204e7005503b33 < 0624e29c595b05e7a0e6d1c368f0a05799928e30affected
LinuxLinux5e1c67abc9301d05130b7e267c204e7005503b33 < 1ea050da5562af9b930d17cbbe9632d30f5df43aaffected
LinuxLinux4725344ca645a98a9d8e45e25b01a2244de5b8aaaffected
LinuxLinux6.6.66 < 6.6.89affected
LinuxLinux6.12.2 < 6.12.26affected
LinuxLinux6.11.11 < 6.12affected
LinuxLinux6.13affected
LinuxLinux0 < 6.13unaffected
LinuxLinux6.6.89 <= 6.6.*unaffected
LinuxLinux6.12.26 <= 6.12.*unaffected
LinuxLinux6.14.5 <= 6.14.*unaffected
LinuxLinux6.15 <= *unaffected

Weaknesses

References