{"id":"CVE-2021-47109","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nneighbour: allow NUD_NOARP entries to be forced GCed\n\nIFF_POINTOPOINT interfaces use NUD_NOARP entries for IPv6. It's possible to\nfill up the neighbour table with enough entries that it will overflow for\nvalid connections after that.\n\nThis behaviour is more prevalent after commit 58956317c8de (\"neighbor:\nImprove garbage collection\") is applied, as it prevents removal from\nentries that are not NUD_FAILED, unless they are more than 5s old.","modified":"2026-03-15T22:43:05.059093Z","published":"2024-03-15T21:15:06.457Z","related":["SUSE-SU-2024:1454-1","SUSE-SU-2024:1465-1","SUSE-SU-2024:1489-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/d17d47da59f726dc4c87caebda3a50333d7e2fd3"},{"type":"FIX","url":"https://git.kernel.org/stable/c/d99029e6aab62aef0a0251588b2867e77e83b137"},{"type":"FIX","url":"https://git.kernel.org/stable/c/ddf088d7aaaaacfc836104f2e632b29b1d383cfc"},{"type":"FIX","url":"https://git.kernel.org/stable/c/7a6b1ab7475fd6478eeaf5c9d1163e7a18125c8f"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47109.json","unresolved_ranges":[{"events":[{"introduced":"5.0"},{"fixed":"5.4.125"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.43"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.12.10"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc2"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc3"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc4"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc5"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc6"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}