{"id":"CVE-2026-43383","revision":"53ea746958584ee0b45021b671d0b493","records":[{"revision":"53ea746958584ee0b45021b671d0b493","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-43383","aliases":[],"title":"net/tcp-md5: Fix MAC comparison to be constant-time","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tcp-md5: Fix MAC comparison to be constant-time\n\nTo prevent timing attacks, MACs need to be compared in constant\ntime.  Use the appropriate helper function for this.","state":0,"publishedAt":"2026-05-08T14:21:30.704+00:00","modifiedAt":"2026-10-19T19:16:28.193+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/ipv4/Kconfig\",\n                        \"net/ipv4/tcp.c\",\n                        \"net/ipv4/tcp_ipv4.c\",\n                        \"net/ipv6/tcp_ipv6.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"cfb6eeb4c860592edd123fdea908d23c6ad1c7dc\",\n                            \"lessThan\": \"821c8751fdeecdeecabeb11704dd33439c9e4bbc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cfb6eeb4c860592edd123fdea908d23c6ad1c7dc\",\n                            \"lessThan\": \"ff44ec94d4fc8348600a69de0a8fa1102c23bce8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cfb6eeb4c860592edd123fdea908d23c6ad1c7dc\",\n                            \"lessThan\": \"345a9530756528d7ca407663d659c3c40e75c3dd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cfb6eeb4c860592edd123fdea908d23c6ad1c7dc\",\n                            \"lessThan\": \"5d305a95130a8d08b9545e47f1e18d29d59866cb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cfb6eeb4c860592edd123fdea908d23c6ad1c7dc\",\n                            \"lessThan\": \"02669e2a4d207068edce7e8b5fafd85822018ce6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cfb6eeb4c860592edd123fdea908d23c6ad1c7dc\",\n                            \"lessThan\": \"ae3831b44f477de048287493e184fc3ff913b624\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cfb6eeb4c860592edd123fdea908d23c6ad1c7dc\",\n                            \"lessThan\": \"b502e97e29d791ff7a8051f29a414535739be218\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"cfb6eeb4c860592edd123fdea908d23c6ad1c7dc\",\n                            \"lessThan\": \"46d0d6f50dab706637f4c18a470aac20a21900d3\",\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/ipv4/Kconfig\",\n                        \"net/ipv4/tcp.c\",\n                        \"net/ipv4/tcp_ipv4.c\",\n                        \"net/ipv6/tcp_ipv6.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.20\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.20\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.253\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.210\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.167\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.130\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.78\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.19\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.9\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\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:L/I:H/A:H","score":9.4,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/821c8751fdeecdeecabeb11704dd33439c9e4bbc","https://git.kernel.org/stable/c/ff44ec94d4fc8348600a69de0a8fa1102c23bce8","https://git.kernel.org/stable/c/345a9530756528d7ca407663d659c3c40e75c3dd","https://git.kernel.org/stable/c/5d305a95130a8d08b9545e47f1e18d29d59866cb","https://git.kernel.org/stable/c/02669e2a4d207068edce7e8b5fafd85822018ce6","https://git.kernel.org/stable/c/ae3831b44f477de048287493e184fc3ff913b624","https://git.kernel.org/stable/c/b502e97e29d791ff7a8051f29a414535739be218","https://git.kernel.org/stable/c/46d0d6f50dab706637f4c18a470aac20a21900d3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43383","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-43383","identifiers":["CVE-2026-43383"]},"retained":false,"historicalAffected":[]}],"coverage":[]}