{"id":"CVE-2026-89751","revision":"0c99fe4493af4a2bbc43648cae55ed96","records":[{"revision":"0c99fe4493af4a2bbc43648cae55ed96","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89751","aliases":[],"title":"x86/tdx: Fix off-by-one in port I/O handling","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nx86/tdx: Fix off-by-one in port I/O handling\n\nhandle_in() and handle_out() in arch/x86/coco/tdx/tdx.c use:\n\n    u64 mask = GENMASK(BITS_PER_BYTE * size, 0);\n\nGENMASK(h, l) includes bit h. For size=1 (INB), this produces\nGENMASK(8, 0) = 0x1FF (9 bits) instead of GENMASK(7, 0) = 0xFF (8\nbits). The mask is one bit too wide for all I/O sizes.\n\nFix the mask calculation.","state":0,"publishedAt":"2026-09-11T19:46:55.314+00:00","modifiedAt":"2026-10-19T08:52:05.025+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                        \"arch/x86/coco/tdx/tdx.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"03149948832a078f759022ed5b92e722d8d23c26\",\n                            \"lessThan\": \"c6875423ad849ac234ab9812eb72f37ff8a490b4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"03149948832a078f759022ed5b92e722d8d23c26\",\n                            \"lessThan\": \"220011fe95fc78b2bc2d7d43893bc73957a5c811\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"03149948832a078f759022ed5b92e722d8d23c26\",\n                            \"lessThan\": \"222b7005e4519f633b4cd666226256abbab46a1a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"03149948832a078f759022ed5b92e722d8d23c26\",\n                            \"lessThan\": \"c4a22154870813d10aa0b4c734a574c726f9d4b0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"03149948832a078f759022ed5b92e722d8d23c26\",\n                            \"lessThan\": \"bb45f705c4440dd3c689328319b88dd28770bbb8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"03149948832a078f759022ed5b92e722d8d23c26\",\n                            \"lessThan\": \"0f63e656b1c679d32ac595de29d10c03efca6a25\",\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                        \"arch/x86/coco/tdx/tdx.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.19\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.19\",\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\": \"6.12.109\",\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":[],"references":["https://git.kernel.org/stable/c/c6875423ad849ac234ab9812eb72f37ff8a490b4","https://git.kernel.org/stable/c/220011fe95fc78b2bc2d7d43893bc73957a5c811","https://git.kernel.org/stable/c/222b7005e4519f633b4cd666226256abbab46a1a","https://git.kernel.org/stable/c/c4a22154870813d10aa0b4c734a574c726f9d4b0","https://git.kernel.org/stable/c/bb45f705c4440dd3c689328319b88dd28770bbb8","https://git.kernel.org/stable/c/0f63e656b1c679d32ac595de29d10c03efca6a25"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89751","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89751","identifiers":["CVE-2026-89751"]},"retained":false,"historicalAffected":[]}],"coverage":[]}