{"id":"CVE-2026-89529","revision":"0d9c31a1c8dc49c5b43ff7d4a8a211af","records":[{"revision":"0d9c31a1c8dc49c5b43ff7d4a8a211af","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89529","aliases":[],"title":"svcrdma: Reject oversized Read segments at decode time","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsvcrdma: Reject oversized Read segments at decode time\n\nThe RPC/RDMA Read list decoder stores wire-supplied segment\nlengths without validation. xdr_count_read_segments() checks\n4-byte alignment for non-zero position values but does not\ncap the segment length.\n\nAn oversized rs_length reaches svc_rdma_build_read_segment(),\nwhich derives nr_bvec from it and can drive a large dynamic\nbvec allocation before verifying that enough rq_pages remain.\nIf the post-allocation page-overrun guard fires, the freshly\nacquired rw context is not returned, leaking the resource.\n\nReject any segment whose length exceeds the receive context's\npage budget during Read list decoding, consistent with how\nxdr_check_write_chunk() bounds Write segment counts against\nrc_maxpages. Also return the rw context on the existing\npost-allocation overrun path in svc_rdma_build_read_segment(),\nkeeping that defensive guard balanced.","state":0,"publishedAt":"2026-09-11T19:44:09.259+00:00","modifiedAt":"2026-10-19T08:48:20.953+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sunrpc/xprtrdma/svc_rdma_recvfrom.c\",\n                        \"net/sunrpc/xprtrdma/svc_rdma_rw.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5ee62b4a91137557ee4b09d1604f1dfd0b4344a8\",\n                            \"lessThan\": \"5120fe54e0e2f5b62797a432115cc61d61117a5b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5ee62b4a91137557ee4b09d1604f1dfd0b4344a8\",\n                            \"lessThan\": \"af6f0e06bed818ee7fc8b869915964410020a1c5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/sunrpc/xprtrdma/svc_rdma_recvfrom.c\",\n                        \"net/sunrpc/xprtrdma/svc_rdma_rw.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"7.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/5120fe54e0e2f5b62797a432115cc61d61117a5b","https://git.kernel.org/stable/c/af6f0e06bed818ee7fc8b869915964410020a1c5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89529","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89529","identifiers":["CVE-2026-89529"]},"retained":false,"historicalAffected":[]}],"coverage":[]}