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Vulnerability record · CVE-2026-13087 · published 22 September 2026

CVE-2026-13087: Out-of-bounds write vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.47% · top 61.8% CWE-787 · Out-of-bounds write Awaiting Analysis
8.8CVSS 3.1 base score
0.47%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
3References
22 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-13087), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.