CVE-2025-71084: RDMA/cm: Fix leaking the multicast GID table reference
In the Linux kernel, the following vulnerability has been resolved:
RDMA/cm: Fix leaking the multicast GID table reference
If the CM ID is destroyed while the CM event for multicast creating is still queued the cancelworksync() will prevent the work from running which also prevents destroying the ahattr. This leaks a refcount and triggers a WARN:
GID entry ref leak for dev syz1 index 2 ref=573 WARNING: CPU: 1 PID: 655 at drivers/infiniband/core/cache.c:809 releasegidtable drivers/infiniband/core/cache.c:806 [inline] WARNING: CPU: 1 PID: 655 at drivers/infiniband/core/cache.c:809 gidtablereleaseone+0x284/0x3cc drivers/infiniband/core/cache.c:886
Destroy the ahattr after canceling the work, it is safe to call this twice.
Affected Software
Remediation
Event History
Frequently Asked Questions
What is the severity of CVE-2025-71084?
CVE-2025-71084 is categorized as a medium severity vulnerability.
How do I fix CVE-2025-71084?
To fix CVE-2025-71084, update your Linux kernel to the latest version provided by your distribution.
What systems are affected by CVE-2025-71084?
CVE-2025-71084 affects versions of the Linux kernel that utilize RDMA/cm for multicast operations.
What type of vulnerability is CVE-2025-71084?
CVE-2025-71084 is a resource leakage vulnerability related to the multicast GID table in the Linux kernel.
Is there a known exploit for CVE-2025-71084?
As of now, there are no publicly known exploits specifically targeting CVE-2025-71084.