CVE-2026-52939

kernel: net/rds: fix NULL deref in rds_ib_send_cqe_handler() on masked atomic completion

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Severity

Moderate

Red Hat Product Security

5.5

CVSS 3.1

Review impact separately from score.

Published · June 24, 2026

Updated · July 9, 2026

Description

A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS) component. An unprivileged local user can trigger a kernel panic by sending a specially crafted atomic control message (cmsg) over an active RDS/InfiniBand (IB) connection. This issue is caused by improper handling of masked atomic completion operations, leading to a null pointer dereference. Successful exploitation results in a system crash, causing a Denial of Service (DoS).

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.5
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-476 · NULL Pointer Dereference