CVE-2024-42145

/// Technical description

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

IB/core: Implement a limit on UMAD receive List

The existing behavior of ib_umad, which maintains received MAD

packets in an unbounded list, poses a risk of uncontrolled growth.

As user-space applications extract packets from this list, the rate

of extraction may not match the rate of incoming packets, leading

to potential list overflow.

To address this, we introduce a limit to the size of the list. After

considering typical scenarios, such as OpenSM processing, which can

handle approximately 100k packets per second, and the 1-second retry

timeout for most packets, we set the list size limit to 200k. Packets

received beyond this limit are dropped, assuming they are likely timed

out by the time they are handled by user-space.

Notably, packets queued on the receive list due to reasons like

timed-out sends are preserved even when the list is full.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References