CVE-2026-98253
kernel: RDMA/ucma: Serialize join and leave on copy_to_user failure
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · October 6, 2026
Updated · October 9, 2026
Description
A flaw was found in the Linux kernel's RDMA (Remote Direct Memory Access) subsystem. A local attacker can cause a Denial of Service (DoS) or memory corruption by exploiting a race condition in the User Connection Manager Access (ucma) component. This issue occurs when concurrent multicast join requests using identical addresses encounter an error, leading to a use-after-free condition due to improper synchronization.
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 · 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-825 · Expired Pointer Dereference