{"id":"CVE-2026-74262","revision":"4a01a19bda7b45c6a0605e0f784a548a","records":[{"revision":"4a01a19bda7b45c6a0605e0f784a548a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74262","aliases":[],"title":"kcm: use WRITE_ONCE() when changing lower socket callbacks","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nkcm: use WRITE_ONCE() when changing lower socket callbacks\n\nkcm_attach() replaces a live lower TCP socket's sk_data_ready and\nsk_write_space callbacks with KCM handlers, and kcm_unattach() restores\nthem later. Those callback-pointer updates are still plain stores even\nthough the same fields can be read and invoked concurrently on other\nCPUs.\n\nIf another CPU observes an older callback snapshot after the live field\nhas already been restored, callback execution can run with a mismatched\ntarget and sk_user_data state, leading to stale or misdirected wakeups.\n\nUse WRITE_ONCE() for the callback replacement and restore operations so\nthese shared callback fields follow the same visibility contract already\nestablished by the earlier 4022 fixes.","state":0,"publishedAt":"2026-08-15T05:57:38.99+00:00","modifiedAt":"2026-10-16T18:55:28.552+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/kcm/kcmsock.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\n                            \"lessThan\": \"0cb3e2f40679032c1aa2186280a86e5ead0161ee\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\n                            \"lessThan\": \"fa26e4606aed0f7fe793c325506adeda1d847a43\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\n                            \"lessThan\": \"b4ccd6eef671d7c44a30123cd29f3acf3de8468e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\n                            \"lessThan\": \"b8c90823cdfb5f3d22f261aeb3e9066612853c36\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\n                            \"lessThan\": \"11faefd11ce2448bac7279ab302dd1954a6547fe\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\n                            \"lessThan\": \"f01fb6138f8eb606b56ce9158e2d8b72352c53f4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\n                            \"lessThan\": \"9684fff87124b201e11dea01ded9173025359a0f\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ab7ac4eb9832e32a09f4e8042705484d2fb0aad3\",\n                            \"lessThan\": \"47186409c092cd7dd70350999186c700233e854d\",\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/kcm/kcmsock.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.6\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.6\",\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\": \"6.12.97\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.40\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.5\",\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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/0cb3e2f40679032c1aa2186280a86e5ead0161ee","https://git.kernel.org/stable/c/fa26e4606aed0f7fe793c325506adeda1d847a43","https://git.kernel.org/stable/c/b4ccd6eef671d7c44a30123cd29f3acf3de8468e","https://git.kernel.org/stable/c/b8c90823cdfb5f3d22f261aeb3e9066612853c36","https://git.kernel.org/stable/c/11faefd11ce2448bac7279ab302dd1954a6547fe","https://git.kernel.org/stable/c/f01fb6138f8eb606b56ce9158e2d8b72352c53f4","https://git.kernel.org/stable/c/9684fff87124b201e11dea01ded9173025359a0f","https://git.kernel.org/stable/c/47186409c092cd7dd70350999186c700233e854d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74262","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74262","identifiers":["CVE-2026-74262"]},"retained":false,"historicalAffected":[]}],"coverage":[]}