{"id":"CVE-2026-89743","revision":"218eb39be1bb43f9bfc20945d013fc97","records":[{"revision":"218eb39be1bb43f9bfc20945d013fc97","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89743","aliases":[],"title":"misc: nsm: bound the device-reported response length","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: nsm: bound the device-reported response length\n\nnsm_sendrecv_msg_locked() stores the virtqueue used-ring length reported\nby the NSM device into msg->resp.len without bounding it to the response\nbuffer. A malicious or buggy backend can report a length larger than the\nresponse buffer; parse_resp_raw() then copies that many bytes out of the\nfixed buffer to user space, disclosing adjacent kernel heap (an\nout-of-bounds read). The request path already floors its length in\nfill_req_raw(); the response path lacks the symmetric check.\n\nClamp the stored length to the size of the response buffer. Well-behaved\ndevices report no more than the posted buffer size, so conforming traffic\nis unaffected.","state":0,"publishedAt":"2026-09-11T19:46:49.261+00:00","modifiedAt":"2026-10-19T08:51:57.186+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/misc/nsm.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"b9873755a6c8ccfce79094c4dce9efa3ecb1a749\",\n                            \"lessThan\": \"339f19b9a6171289b0e797deb8bda80b9a1fcc30\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b9873755a6c8ccfce79094c4dce9efa3ecb1a749\",\n                            \"lessThan\": \"29e634a18957acda11383a15ab98a91c4ae9e294\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b9873755a6c8ccfce79094c4dce9efa3ecb1a749\",\n                            \"lessThan\": \"2aa0fb9c96f894a9c179a48e7522ea6705800adf\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b9873755a6c8ccfce79094c4dce9efa3ecb1a749\",\n                            \"lessThan\": \"808e530654a5354e6df78863a5d61e4d44e67235\",\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/misc/nsm.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.8\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.8\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\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":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","score":7.7,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/339f19b9a6171289b0e797deb8bda80b9a1fcc30","https://git.kernel.org/stable/c/29e634a18957acda11383a15ab98a91c4ae9e294","https://git.kernel.org/stable/c/2aa0fb9c96f894a9c179a48e7522ea6705800adf","https://git.kernel.org/stable/c/808e530654a5354e6df78863a5d61e4d44e67235"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89743","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89743","identifiers":["CVE-2026-89743"]},"retained":false,"historicalAffected":[]}],"coverage":[]}