Improper Input Validation Affecting kernel-rt-devel package, versions *

Note: Versions mentioned in the description apply only to the upstream kernel-rt-devel package and not the kernel-rt-devel package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

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.

• https://access.redhat.com/security/cve/CVE-2024-40992
• https://git.kernel.org/stable/c/163868ec1f6c610d16da9e458fe1dd7d5de97341
• https://git.kernel.org/stable/c/943c94f41dfe36536dc9aaa12c9efdf548ceb996
• https://git.kernel.org/stable/c/f67ac0061c7614c1548963d3ef1ee1606efd8636