Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected fbc0a0c7718a6cb1dc5e0811a4f88a2b1deedfa1 before 142273a49f2c315eabdbdf5a71c15e479b75ca91; affected 9258c9ed32294ce3a4b58c9d92fc49ba030d35c9 before bce3055b08e303e28a8751f6073066f5c33a0744; affected 5e1c67abc9301d05130b7e267c204e7005503b33 before 0624e29c595b05e7a0e6d1c368f0a05799928e30; affected 5e1c67abc9301d05130b7e267c204e7005503b33 before 1ea050da5562af9b930d17cbbe9632d30f5df43a; affected 4725344ca645a98a9d8e45e25b01a2244de5b8aa; affected 6.6.66 before 6.6.89; affected 6.12.2 before 6.12.26; affected 6.11.11 before 6.12 |
| Linux / Linux | affected 6.13; unaffected 0 before 6.13; unaffected 6.6.89 through 6.6.*; unaffected 6.12.26 through 6.12.*; unaffected 6.14.5 through 6.14.*; unaffected 6.15 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/142273a49f2c315eabdbdf5a71c15e479b75ca91
- https://git.kernel.org/stable/c/bce3055b08e303e28a8751f6073066f5c33a0744
- https://git.kernel.org/stable/c/0624e29c595b05e7a0e6d1c368f0a05799928e30
- https://git.kernel.org/stable/c/1ea050da5562af9b930d17cbbe9632d30f5df43a
ADP enrichment
No English description supplied.
No references supplied.