{"id":"CVE-2026-68116","title":"vxlan: mdb: Fix source list corruption on a failed replace","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: mdb: Fix source list corruption on a failed replace\n\nWhen replacing the source list of an MDB remote entry, all existing\nsources are first marked for deletion an…","severity":"high","cvss":7.9,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= a3a48de5eade770e911d35291217bdd69ce04ef1 < 5bc8fc1d2ff802eec839e03adef5df597421898d","Linux >= a3a48de5eade770e911d35291217bdd69ce04ef1 < 2c54dff57606590fa4abec46bab6bea3133f1539","Linux >= a3a48de5eade770e911d35291217bdd69ce04ef1 < 79370b573e92e8f190eb5f9a511fa5398340d8b2","Linux >= a3a48de5eade770e911d35291217bdd69ce04ef1 < 54a3c27b357dfb34f327f89bfadeb998bef8051e","Linux >= a3a48de5eade770e911d35291217bdd69ce04ef1 < dcd9b465965422b9654f6026e8a2fa8984f74c3c","Linux 6.4"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-16T15:44:03.646035Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:52:57.372Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68116","references":[{"url":"https://git.kernel.org/stable/c/5bc8fc1d2ff802eec839e03adef5df597421898d"},{"url":"https://git.kernel.org/stable/c/2c54dff57606590fa4abec46bab6bea3133f1539"},{"url":"https://git.kernel.org/stable/c/79370b573e92e8f190eb5f9a511fa5398340d8b2"},{"url":"https://git.kernel.org/stable/c/54a3c27b357dfb34f327f89bfadeb998bef8051e"},{"url":"https://git.kernel.org/stable/c/dcd9b465965422b9654f6026e8a2fa8984f74c3c"}],"tags":["cve.org"],"epss":0.00121,"epssPercentile":0.0176,"ingestedAt":"2026-10-16T17:24:46.840Z","slug":"CVE-2026-68116","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: mdb: Fix source list corruption on a failed replace\n\nWhen replacing the source list of an MDB remote entry, all existing\nsources are first marked for deletion and vxlan_mdb_remote_srcs_add()\nis then called to add the new source list. Sources present in the new\nlist have their deletion mark cleared, and any sources left marked\nafterwards are removed.\n\nIf vxlan_mdb_remote_srcs_add() fails partway through, its error path\ndeletes all entries on the remote's source list. That rollback is only\ncorrect for its other caller, vxlan_mdb_remote_add(), where the remote\nwas just allocated and the list contains solely entries added during\nthe call. On the replace path the list also holds pre-existing sources,\nso a failed replace tears them down together with their (S, G)\nforwarding entries instead of leaving the entry unchanged.\n\nThis is reachable from an existing (*, G) remote. An EXCLUDE filter\nthat loses sources starts forwarding traffic that should be blocked,\nwhile an INCLUDE filter that loses sources drops traffic that should be\nforwarded.\n\nMark entries created during the current pass with a new\nVXLAN_SGRP_F_NEW flag. On failure, delete only those entries and clear\nthe deletion mark on the pre-existing ones, so a failed replace leaves\nthe source list untouched. Retain the flag until the whole operation\nsucceeds and then clear it. Also stop vxlan_mdb_remote_src_add() from\ndeleting a pre-existing entry it only looked up when adding that\nentry's forwarding entry fails.\n\n## Affected\n\n- `Linux >= a3a48de5eade770e911d35291217bdd69ce04ef1 < 5bc8fc1d2ff802eec839e03adef5df597421898d`\n- `Linux >= a3a48de5eade770e911d35291217bdd69ce04ef1 < 2c54dff57606590fa4abec46bab6bea3133f1539`\n- `Linux >= a3a48de5eade770e911d35291217bdd69ce04ef1 < 79370b573e92e8f190eb5f9a511fa5398340d8b2`\n- `Linux >= a3a48de5eade770e911d35291217bdd69ce04ef1 < 54a3c27b357dfb34f327f89bfadeb998bef8051e`\n- `Linux >= a3a48de5eade770e911d35291217bdd69ce04ef1 < dcd9b465965422b9654f6026e8a2fa8984f74c3c`\n- `Linux 6.4`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":43.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}