{"id":"CVE-2026-89969","revision":"b66dded8919746a7b2a1fea5afe2a56b","records":[{"revision":"b66dded8919746a7b2a1fea5afe2a56b","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89969","aliases":[],"title":"nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-tcp: fix out-of-bounds write when receiving an over-long PDU\n\nnvmet_tcp_try_recv_pdu() reads a PDU header into the fixed 128-byte\nqueue->pdu union, then computes the remaining payload length as\n\n\tqueue->left = hdr->hlen - queue->offset + hdgst;\n\nand reads that many more bytes into &queue->pdu + queue->offset, without\never bounding the result against sizeof(queue->pdu).\n\nA struct nvme_tcp_icreq_pdu is itself 128 bytes, exactly the size of the\nunion. Once a header digest has been negotiated (hdgst = 4), a second\nICReq passes the hlen == nvmet_tcp_pdu_size() check but yields\nqueue->left = 128 - 8 + 4 = 124, so bytes 8..132 are written into the\n128-byte buffer -- 4 bytes past its end, over queue->hdr_digest and\nqueue->data_digest. Those bytes are attacker-controlled (an ICReq\ncarries no digest), and the duplicate ICReq is only rejected later,\nafter the overflow. A remote unauthenticated host can thus corrupt\nkernel memory adjacent to the receive buffer.\n\nReject any PDU whose declared length would read past the end of\nqueue->pdu before the second recv.","state":0,"publishedAt":"2026-09-16T10:32:49.603+00:00","modifiedAt":"2026-10-19T08:55:42.82+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/nvme/target/tcp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\n                            \"lessThan\": \"a3f0bcfbaf3312a5754d1ce020a07d394669eb25\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\n                            \"lessThan\": \"4f84d42c53c49557fb1ef285c683b0a81b576c74\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\n                            \"lessThan\": \"58dc6035b79c4c73c0cbf9ec9f68a7f117b2b3e6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\n                            \"lessThan\": \"cf5f39d2b58f97e0cd1829c4a6aeef17f1607cca\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\n                            \"lessThan\": \"3a385e0c39efbe34db8edd95900c123113ae3450\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\n                            \"lessThan\": \"dbc4acbdb3ca8c81441368ad7409b8f77d4de8f6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\n                            \"lessThan\": \"d95d342bc0ea82dc79e6362b2f1f997431750e4c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"872d26a391da92ed8f0c0f5cb5fef428067b7f30\",\n                            \"lessThan\": \"14cc5a7e77731497d5bea70f3bb05df7eda982e4\",\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/nvme/target/tcp.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.51\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.5\",\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":[{"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/a3f0bcfbaf3312a5754d1ce020a07d394669eb25","https://git.kernel.org/stable/c/4f84d42c53c49557fb1ef285c683b0a81b576c74","https://git.kernel.org/stable/c/58dc6035b79c4c73c0cbf9ec9f68a7f117b2b3e6","https://git.kernel.org/stable/c/cf5f39d2b58f97e0cd1829c4a6aeef17f1607cca","https://git.kernel.org/stable/c/3a385e0c39efbe34db8edd95900c123113ae3450","https://git.kernel.org/stable/c/dbc4acbdb3ca8c81441368ad7409b8f77d4de8f6","https://git.kernel.org/stable/c/d95d342bc0ea82dc79e6362b2f1f997431750e4c","https://git.kernel.org/stable/c/14cc5a7e77731497d5bea70f3bb05df7eda982e4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89969","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89969","identifiers":["CVE-2026-89969"]},"retained":false,"historicalAffected":[]}],"coverage":[]}