SB20260925219 - Out-of-bounds write in Linux kernel RPC-over-RDMA server reply path in net/sunrpc/xprtrdma/svc_rdma_sendto.c

Description

This security bulletin contains information about 1 vulnerability.

1) Out-of-bounds write (CVE-ID: CVE-2026-13087)

CWE-ID: CWE-787 - Out-of-bounds write

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote user to cause a denial of service or potentially execute arbitrary code.

The vulnerability exists due to a heap-based out-of-bounds write in the RPC-over-RDMA server reply path in net/sunrpc/xprtrdma/svc_rdma_sendto.c when processing a crafted large NFS READ request with an empty Write list and no Reply chunk. A remote user can send a crafted RPC-over-RDMA request to cause a denial of service or potentially execute arbitrary code.

Remediation

Install update from vendor's website.

References

• https://access.redhat.com/security/cve/CVE-2026-13087
• https://bugzilla.redhat.com/show_bug.cgi?id=2470788