In the Linux kernel, the following vulnerability has been resolved:
usb: xhci: Fix NULL pointer dereference on certain command aborts
If a command is queued to the final usable TRB of a ring segment, the
enqueue pointer is advanced to the subsequent link TRB and no further.
If the command is later aborted, when the abort completion is handled
the dequeue pointer is advanced to the first TRB of the next segment.
If no further commands are queued, xhci_handle_stopped_cmd_ring() sees
the ring pointers unequal and assumes that there is a pending command,
so it calls xhci_mod_cmd_timer() which crashes if cur_cmd was NULL.
Don't attempt timer setup if cur_cmd is NULL. The subsequent doorbell
ring likely is unnecessary too, but it's harmless. Leave it alone.
This is probably Bug 219532, but no confirmation has been received.
The issue has been independently reproduced and confirmed fixed using
a USB MCU programmed to NAK the Status stage of SET_ADDRESS forever.
Everything continued working normally after several prevented crashes.
Metrics
Affected Vendors & Products
References
History
Thu, 13 Mar 2025 13:45:00 +0000
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First Time appeared |
Linux
Linux linux Kernel |
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CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
Vendors & Products |
Linux
Linux linux Kernel |
Thu, 13 Mar 2025 12:30:00 +0000
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References |
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Wed, 12 Mar 2025 06:45:00 +0000
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Weaknesses | CWE-476 |
Fri, 28 Feb 2025 02:00:00 +0000
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References |
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Metrics |
threat_severity
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cvssV3_1
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Thu, 27 Feb 2025 02:15:00 +0000
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Description | In the Linux kernel, the following vulnerability has been resolved: usb: xhci: Fix NULL pointer dereference on certain command aborts If a command is queued to the final usable TRB of a ring segment, the enqueue pointer is advanced to the subsequent link TRB and no further. If the command is later aborted, when the abort completion is handled the dequeue pointer is advanced to the first TRB of the next segment. If no further commands are queued, xhci_handle_stopped_cmd_ring() sees the ring pointers unequal and assumes that there is a pending command, so it calls xhci_mod_cmd_timer() which crashes if cur_cmd was NULL. Don't attempt timer setup if cur_cmd is NULL. The subsequent doorbell ring likely is unnecessary too, but it's harmless. Leave it alone. This is probably Bug 219532, but no confirmation has been received. The issue has been independently reproduced and confirmed fixed using a USB MCU programmed to NAK the Status stage of SET_ADDRESS forever. Everything continued working normally after several prevented crashes. | |
Title | usb: xhci: Fix NULL pointer dereference on certain command aborts | |
References |
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Status: PUBLISHED
Assigner: Linux
Published: 2025-02-27T02:07:07.489Z
Updated: 2025-03-24T15:37:27.646Z
Reserved: 2025-02-27T02:04:28.913Z
Link: CVE-2024-57981

No data.

Status : Modified
Published: 2025-02-27T02:15:11.293
Modified: 2025-03-13T13:15:43.150
Link: CVE-2024-57981
