{"id":"CVE-2026-80838","revision":"eda6ecc67e384c5c8a7dc16c67de02b5","records":[{"revision":"eda6ecc67e384c5c8a7dc16c67de02b5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80838","aliases":[],"title":"vxlan: keep the last remote linked during FDB flush","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nvxlan: keep the last remote linked during FDB flush\n\nA non-nexthop FDB entry is expected to have at least one remote while it\nremains reachable through the FDB hash table. A filtered bulk flush\nviolates this invariant when every remote matches: It unlinks the last\nremote in vxlan_fdb_dst_destroy() and only afterwards tells vxlan_flush()\nto destroy the parent FDB entry.\n\nAn RCU reader can find the parent during this interval.\nfirst_remote_rcu() then applies list_entry_rcu() to the empty list head,\nproducing an invalid remote pointer that the receive learning path can\nread from and write to.\n\nWhen a matching remote is the sole remaining remote, leave it linked and\nask the caller to destroy the entire FDB entry. vxlan_fdb_destroy() keeps\nthe remote attached while sending the deletion notification and removing\nthe parent from the lookup structures.","state":0,"publishedAt":"2026-09-04T15:54:48.371+00:00","modifiedAt":"2026-10-19T08:44:30.457+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/net/vxlan/vxlan_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f\",\n                            \"lessThan\": \"2a7c2f00843225d5f037676bca649321f3d024c7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f\",\n                            \"lessThan\": \"a8820c8a7718327e96849782033e7c85a0f6bcfe\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f\",\n                            \"lessThan\": \"8ba68fd6cdd1e3c92b92f25c7e48bf7bd51a183c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f\",\n                            \"lessThan\": \"4bbc76ee1b21d3bd045d6d819b2bacd30a6372ab\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"c499fccb71cb85902b5c5b9ce9c9ae6683e54a8f\",\n                            \"lessThan\": \"d5d4a7b538b52db63927773a8905fcd9f78a42e2\",\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/net/vxlan/vxlan_core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.7\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.108\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.49\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.13\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.3\",\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/2a7c2f00843225d5f037676bca649321f3d024c7","https://git.kernel.org/stable/c/a8820c8a7718327e96849782033e7c85a0f6bcfe","https://git.kernel.org/stable/c/8ba68fd6cdd1e3c92b92f25c7e48bf7bd51a183c","https://git.kernel.org/stable/c/4bbc76ee1b21d3bd045d6d819b2bacd30a6372ab","https://git.kernel.org/stable/c/d5d4a7b538b52db63927773a8905fcd9f78a42e2"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80838","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80838","identifiers":["CVE-2026-80838"]},"retained":false,"historicalAffected":[]}],"coverage":[]}