SB20260815261 - Use-after-free in Linux kernel sunrpc xprtrdma

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-72469)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to use-after-free in rpcrdma_cm_event_handler() and RDMA connection teardown handling in the xprtrdma component when processing an RDMA_CM_EVENT_ADDR_CHANGE event before RDMA_CM_EVENT_ESTABLISHED. A local user can trigger crafted RDMA connection state changes to cause a denial of service.

The issue occurs because an unmatched reference decrement can underflow the kref and leave disconnect handling operating on a freed endpoint.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/af9b65b29af341932625c4283dc7a23cdb62688a
• https://git.kernel.org/stable/c/cfd1bab66b042da7a778786685125656c695931b
• https://git.kernel.org/stable/c/d0479c2b12974aa188b10d221a5770126b118b6d
• https://git.kernel.org/stable/c/ffc07790539736a5d029f6a3c966b46c529f93a8