{"schema":"threatline.record/2","record":{"id":"CVE-2026-99126","aliases":[],"summary":"s390/ctcm: Prevent XID null dereference","details":"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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99126","source_modified_at":"2026-10-28T10:34:40.661Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"293d984f0e3604c04dcdbf00117ddc1e5d4b1909","lessThan":"34fa3607b7604b3052b19cec8b0ad644818cdd2a","status":"affected","versionType":"git"},{"version":"293d984f0e3604c04dcdbf00117ddc1e5d4b1909","lessThan":"8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab","status":"affected","versionType":"git"},{"version":"293d984f0e3604c04dcdbf00117ddc1e5d4b1909","lessThan":"b264d8422779d69febce914efc47a92a85cc382c","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99126","source_modified_at":"2026-10-28T10:34:40.661Z","fetched_at":"2026-10-28T15:55:58.673066Z","product":"Linux","vendor":"Linux","versions":[{"version":"2.6.26","status":"affected"},{"version":"0","lessThan":"2.6.26","status":"unaffected","versionType":"semver"},{"version":"6.18.59","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.13","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99126","source_modified_at":"2026-10-28T10:34:40.661Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"34fa3607b7604b3052b19cec8b0ad644818cdd2a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99126","source_modified_at":"2026-10-28T10:34:40.661Z","fetched_at":"2026-10-28T15:55:58.673066Z","package":{"name":"Linux","ecosystem":null},"version":"8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-28T10:34:40.661Z","modified_at":"2026-10-28T10:34:40.661Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-99126","fetched_at":"2026-10-28T15:55:58.673066Z","source_modified_at":"2026-10-28T10:34:40.661Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/34fa3607b7604b3052b19cec8b0ad644818cdd2a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/8a2f7a4ad1d81612fa65bfa4d392ba1bb2f5eeab"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b264d8422779d69febce914efc47a92a85cc382c"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-28T10:34:40.661Z","content_hash":"2dd708079ee19e9dd6b8066cc73833fb99638c1fd36464b90e2bbc9376f61814"}}