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CVE-2024-40992

Disclosure Date: July 12, 2024
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Description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/rxe: Fix responder length checking for UD request packets

According to the IBA specification:
If a UD request packet is detected with an invalid length, the request
shall be an invalid request and it shall be silently dropped by
the responder. The responder then waits for a new request packet.

commit 689c5421bfe0 (“RDMA/rxe: Fix incorrect responder length checking”)
defers responder length check for UD QPs in function copy_data.
But it introduces a regression issue for UD QPs.

When the packet size is too large to fit in the receive buffer.
copy_data will return error code -EINVAL. Then send_data_in
will return RESPST_ERR_MALFORMED_WQE. UD QP will transfer into
ERROR state.

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General Information

Vendors

  • Linux

Products

  • Linux

Additional Info

Technical Analysis