{"id":"CVE-2026-99126","revision":"feee21e23d654d15b8948a070e4a5066","records":[{"revision":"feee21e23d654d15b8948a070e4a5066","observedAt":"2026-10-28T11:27:43.363+00:00","statement":{"source":"cve-program","id":"CVE-2026-99126","aliases":[],"title":"s390/ctcm: Prevent XID null dereference","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/ctcm: Prevent XID null dereference\n\nThe mpc_validate_xid() function sets grp->saved_xid2->xid2_flag2 to 0x40\nto signal XID validation error. If peer XID is NULL or r/w channel\npairing mismatch happens, grp->saved_xid2 is never initialized. An\nattempt to set the flag in such case leads to NULL dereference.\n\nFix this by using the always available priv->xid->xid2_flag2 instead of\ngrp->saved_xid2->xid2_flag2 for validation errors.","state":0,"publishedAt":"2026-10-28T10:34:40.661+00:00","modifiedAt":"2026-10-28T10:34:40.661+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/s390/net/ctcm_mpc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"293d984f0e3604c04dcdbf00117ddc1e5d4b1909\",\n                            \"lessThan\": \"34fa3607b7604b3052b19cec8b0ad644818cdd2a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"293d984f0e3604c04dcdbf00117ddc1e5d4b1909\",\n                            \"lessThan\": \"8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"293d984f0e3604c04dcdbf00117ddc1e5d4b1909\",\n                            \"lessThan\": \"b264d8422779d69febce914efc47a92a85cc382c\",\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/s390/net/ctcm_mpc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"2.6.26\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"2.6.26\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.59\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.13\",\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/34fa3607b7604b3052b19cec8b0ad644818cdd2a","https://git.kernel.org/stable/c/8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab","https://git.kernel.org/stable/c/b264d8422779d69febce914efc47a92a85cc382c"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-99126","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-99126","identifiers":["CVE-2026-99126"]},"retained":false,"historicalAffected":[]}],"coverage":[]}