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{"acknowledgement": "Red Hat would like to thank AISLE Research for reporting this issue.", "bugzilla": {"description": "kernel: Heap out-of-bounds write in the Linux kernel RPC-over-RDMA server reply path...", "id": "2470788", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2470788"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A heap out-of-bounds write vulnerability was found in the Linux kernel's RPC-over-RDMA server reply path in net/sunrpc/xprtrdma/svc_rdma_sendto.c. When a crafted RPC-over-RDMA client sends a large NFS READ request with an empty Write list and no Reply chunk, the server linearizes the entire multi-page reply into a fixed-size 4096-byte heap buffer without bounds checking, resulting in a kernel heap overflow. This can lead to denial of service via kernel crash or potential code execution through corruption of adjacent kernel heap objects."], "mitigation": {"lang": "en:us", "value": "This vulnerability requires the NFS/RDMA server to be running with CONFIG_SUNRPC_XPRT_RDMA enabled, which requires RDMA hardware (InfiniBand or RoCE). Systems that do not have RDMA hardware or do not export NFS over RDMA are not affected. If NFS/RDMA is not required, disabling or not loading the svcrdma kernel module prevents exploitation."}, "name": "CVE-2026-13087", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}], "public_date": "2026-09-22T15:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-13087\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-13087"], "statement": "This Important vulnerability in the Linux kernel's RPC-over-RDMA server allows a low-privileged, authenticated NFS client to trigger a heap overflow. By sending a crafted READ request, an attacker can cause a denial of service or potentially execute arbitrary code, elevating privileges beyond typical NFS access. This affects Red Hat Enterprise Linux systems utilizing NFS/RDMA, commonly deployed in high-performance computing and datacenter environments.", "threat_severity": "Important"}