CVE-2026-89529
Low risk· EPSS 9%Exploitation Probability (EPSS)
Low risk9th percentile - higher than 9% of all known CVEs
Summary
In the Linux kernel svcrdma module, the RPC/RDMA Read list decoder stores wire-supplied segment lengths without validation. An oversized rs_length reaches svc_rdma_build_read_segment(), which derives nr_bvec from it and can drive a large dynamic bvec allocation before verifying that enough rq_pages remain; if the post-allocation page-overrun guard fires, the freshly acquired rw context is not returned, leaking the resource.
Risk Assessment
A remote attacker can send crafted RDMA messages causing resource leaks and ultimately memory exhaustion and denial of service. It affects servers running RDMA services.
Recommendation
Update the Linux kernel to a version with the fix that rejects segments exceeding the receive context's page budget during Read list decoding and returns the rw context on the existing overrun path.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: svcrdma: Reject oversized Read segments at decode time The RPC/RDMA Read list decoder stores wire-supplied segment lengths without validation. xdr_count_read_segments() checks 4-byte alignment for non-zero position values but does not cap the segment length. An oversized rs_length reaches svc_rdma_build_read_segment(), which derives nr_bvec from it and can drive a large dynamic bvec allocation before verifying that enough rq_pages remain. If the post-allocation page-overrun guard fires, the freshly acquired rw context is not returned, leaking the resource. Reject any segment whose length exceeds the receive context's page budget during Read list decoding, consistent with how xdr_check_write_chunk() bounds Write segment counts against rc_maxpages. Also return the rw context on the existing post-allocation overrun path in svc_rdma_build_read_segment(), keeping that defensive guard balanced.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS