CVE-2026-53371

/// Technical description

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

RDMA/ionic: bound node_desc sysfs read with %.64s

node_desc[64] in struct ib_device is not guaranteed to be NUL-

terminated. The core IB sysfs handler uses "%.64s" for exactly this

reason (drivers/infiniband/core/sysfs.c:1307), since node_desc_store()

performs a raw memcpy of up to IB_DEVICE_NODE_DESC_MAX bytes with no NUL

termination:

memcpy(desc.node_desc, buf, min_t(int, count, IB_DEVICE_NODE_DESC_MAX));

If exactly 64 bytes are written via the node_desc sysfs file, the array

contains no NUL byte. The ionic hca_type_show() handler uses unbounded

"%s" and will read past the end of node_desc into adjacent fields of

struct ib_device until it encounters a NUL.

ionic supports IB_DEVICE_MODIFY_NODE_DESC, so this is triggerable by

userspace.

Match the core handler and bound the format specifier.

/// 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