{"id":"CVE-2024-26951","summary":"wireguard: netlink: check for dangling peer via is_dead instead of empty list","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nwireguard: netlink: check for dangling peer via is_dead instead of empty list\n\nIf all peers are removed via wg_peer_remove_all(), rather than setting\npeer_list to empty, the peer is added to a temporary list with a head on\nthe stack of wg_peer_remove_all(). If a netlink dump is resumed and the\ncursored peer is one that has been removed via wg_peer_remove_all(), it\nwill iterate from that peer and then attempt to dump freed peers.\n\nFix this by instead checking peer-\u003eis_dead, which was explictly created\nfor this purpose. Also move up the device_update_lock lockdep assertion,\nsince reading is_dead relies on that.\n\nIt can be reproduced by a small script like:\n\n    echo \"Setting config...\"\n    ip link add dev wg0 type wireguard\n    wg setconf wg0 /big-config\n    (\n            while true; do\n                    echo \"Showing config...\"\n                    wg showconf wg0 \u003e /dev/null\n            done\n    ) &\n    sleep 4\n    wg setconf wg0 \u003c(printf \"[Peer]\\nPublicKey=$(wg genkey)\\n\")\n\nResulting in:\n\n    BUG: KASAN: slab-use-after-free in __lock_acquire+0x182a/0x1b20\n    Read of size 8 at addr ffff88811956ec70 by task wg/59\n    CPU: 2 PID: 59 Comm: wg Not tainted 6.8.0-rc2-debug+ #5\n    Call Trace:\n     \u003cTASK\u003e\n     dump_stack_lvl+0x47/0x70\n     print_address_description.constprop.0+0x2c/0x380\n     print_report+0xab/0x250\n     kasan_report+0xba/0xf0\n     __lock_acquire+0x182a/0x1b20\n     lock_acquire+0x191/0x4b0\n     down_read+0x80/0x440\n     get_peer+0x140/0xcb0\n     wg_get_device_dump+0x471/0x1130","modified":"2026-04-02T10:06:30.609670Z","published":"2024-05-01T05:18:34.520Z","related":["SUSE-SU-2024:1644-1","SUSE-SU-2024:1659-1","SUSE-SU-2024:1663-1","SUSE-SU-2024:2135-1","SUSE-SU-2024:2203-1","SUSE-SU-2024:2973-1","SUSE-SU-2025:20008-1","SUSE-SU-2025:20028-1","SUSE-SU-2025:20166-1","SUSE-SU-2025:20249-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26951.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/13d107794304306164481d31ce33f8fdb25a9c04"},{"type":"WEB","url":"https://git.kernel.org/stable/c/302b2dfc013baca3dea7ceda383930d9297d231d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/55b6c738673871c9b0edae05d0c97995c1ff08c4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/710a177f347282eea162aec8712beb1f42d5ad87"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7bedfe4cfa38771840a355970e4437cd52d4046b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b7cea3a9af0853fdbb1b16633a458f991dde6aac"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f52be46e3e6ecefc2539119784324f0cbc09620a"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26951.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-26951"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e7096c131e5161fa3b8e52a650d7719d2857adfd"},{"fixed":"f52be46e3e6ecefc2539119784324f0cbc09620a"},{"fixed":"710a177f347282eea162aec8712beb1f42d5ad87"},{"fixed":"b7cea3a9af0853fdbb1b16633a458f991dde6aac"},{"fixed":"13d107794304306164481d31ce33f8fdb25a9c04"},{"fixed":"7bedfe4cfa38771840a355970e4437cd52d4046b"},{"fixed":"302b2dfc013baca3dea7ceda383930d9297d231d"},{"fixed":"55b6c738673871c9b0edae05d0c97995c1ff08c4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26951.json"}}],"schema_version":"1.7.5"}