{"id":"CVE-2026-64268","revision":"a62d3583dae74d35875d2dcfcdbff237","records":[{"revision":"a62d3583dae74d35875d2dcfcdbff237","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64268","aliases":[],"title":"RDMA/siw: bound Read Response placement to the RREAD length","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: bound Read Response placement to the RREAD length\n\nIn drivers/infiniband/sw/siw/siw_qp_rx.c, siw_proc_rresp() places each\ninbound Read Response DDP segment at sge->laddr + wqe->processed and then\naccumulates wqe->processed, but it never checks the running total against\nthe sink buffer length on continuation segments. siw_check_sge() resolves\nand validates the sink memory only on the first fragment (the if (!*mem)\nbranch), and siw_rresp_check_ntoh() compares the cumulative length against\nwqe->bytes only on the final segment (the !frx->more_ddp_segs guard).\n\nA connected siw peer that answers an outstanding RREAD with Read Response\nsegments that keep the DDP Last flag clear, carrying more total payload\nthan the RREAD requested, drives wqe->processed past the validated sink\nbuffer; the next siw_rx_data() call writes out of bounds at\nsge->laddr + wqe->processed. siw runs iWARP over ordinary routable TCP,\nso the peer is the remote end of an established RDMA connection and needs\nno local privilege.\n\nBound every segment before placement, exactly as siw_proc_send() and\nsiw_proc_write() already do for their tagged and untagged paths, and\nterminate the connection with a base-or-bounds DDP error when the\nRead Response would overrun the sink buffer.\n\nThis is the second receive-path length fix for this file. A separate\nchange rejects an MPA FPDU length that underflows the per-fragment\nremainder in the header decode; that guard does not cover this case,\nbecause here each individual segment length is self-consistent and only\nthe accumulated placement offset overruns the buffer.","state":0,"publishedAt":"2026-07-25T08:49:16.336+00:00","modifiedAt":"2026-10-19T20:28:16.936+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                        \"drivers/infiniband/sw/siw/siw_qp_rx.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\n                            \"lessThan\": \"a31b6d18ded3cc32d9ee85a6ff0726d4274887b2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\n                            \"lessThan\": \"595e6537ad1a210da32cbb9a7f91aa73090915ba\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\n                            \"lessThan\": \"3ef7e052cbd05a8b13a51a07b185a39ec93ee1cf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\n                            \"lessThan\": \"b2e26c955f8dd7e8d3f16c858db05245ea4fa817\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\n                            \"lessThan\": \"6bc89f34a4597f9f6d41f7a60c67a3153bfe8851\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\n                            \"lessThan\": \"423a78ff7928c2601013f73ec6d896f5597d0df5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\n                            \"lessThan\": \"75c93cd3c421890f49ea93f0b978b9b7bb10e5e3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8b6a361b8c482f22ac99c3273285ff16b23fba91\",\n                            \"lessThan\": \"7d29f7e9dbd844cae4d3e559cf78324b9642fd6b\",\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                        \"drivers/infiniband/sw/siw/siw_qp_rx.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.261\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.212\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.178\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.145\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.96\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.39\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.4\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/a31b6d18ded3cc32d9ee85a6ff0726d4274887b2","https://git.kernel.org/stable/c/595e6537ad1a210da32cbb9a7f91aa73090915ba","https://git.kernel.org/stable/c/3ef7e052cbd05a8b13a51a07b185a39ec93ee1cf","https://git.kernel.org/stable/c/b2e26c955f8dd7e8d3f16c858db05245ea4fa817","https://git.kernel.org/stable/c/6bc89f34a4597f9f6d41f7a60c67a3153bfe8851","https://git.kernel.org/stable/c/423a78ff7928c2601013f73ec6d896f5597d0df5","https://git.kernel.org/stable/c/75c93cd3c421890f49ea93f0b978b9b7bb10e5e3","https://git.kernel.org/stable/c/7d29f7e9dbd844cae4d3e559cf78324b9642fd6b"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64268","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64268","identifiers":["CVE-2026-64268"]},"retained":false,"historicalAffected":[]}],"coverage":[]}