{"id":"CVE-2026-68116","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-68116","summary":"vxlan: mdb: Fix source list corruption on a failed replace","details":"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 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.","published":"2026-08-10T11:58:34.612Z","modified":"2026-08-14T04:03:55.293314041Z","cvss":{"score":7.9,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.6.148"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2c54dff57606590fa4abec46bab6bea3133f1539"},{"type":"WEB","url":"https://git.kernel.org/stable/c/54a3c27b357dfb34f327f89bfadeb998bef8051e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5bc8fc1d2ff802eec839e03adef5df597421898d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/79370b573e92e8f190eb5f9a511fa5398340d8b2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dcd9b465965422b9654f6026e8a2fa8984f74c3c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68116.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-68116"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-14T04:03:55.293314041Z"}}