{"dataType":"CVE_RECORD","cveMetadata":{"cveId":"CVE-2024-26951","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-02-19T14:20:24.198Z","datePublished":"2024-05-01T05:18:34.520Z","dateUpdated":"2026-08-05T11:28:32.058Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T11:28:32.058Z"},"descriptions":[{"lang":"en","value":"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->is_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 > /dev/null\n            done\n    ) &\n    sleep 4\n    wg setconf wg0 <(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     <TASK>\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"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The vulnerable code is reached only through the WireGuard generic-netlink family (`WG_CMD_GET_DEVICE` dump raced against `WG_CMD_SET_DEVICE`), which requires a local netlink socket. Per kernel scoring guidance, netlink-reachable bugs are Local.\nAC:L - The attacker controls both sides of the race — one thread runs the resumable dump while another issues a peer-replace — and controls the peer count that forces multi-skb dump resumption, exactly as in the maintainer's shell-script reproducer. Nothing depends on conditions outside the attacker's influence.\nPR:L - The ops use `GENL_UNS_ADMIN_PERM`, i.e. `netlink_ns_capable(skb, net->user_ns, CAP_NET_ADMIN)`, and the family is `netnsok`, so an unprivileged user can obtain the needed capability via `unshare -Urn` — verified by successfully creating a WireGuard device in a user namespace as a normal user.\nUI:N - Exploitation is entirely driven by the attacker's own two threads issuing netlink requests on a device they created; no victim action or cooperation is involved.\nS:U - The use-after-free corrupts kernel heap state and leaks kernel memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `get_peer()` reads freed `wg_peer` objects and `nla_put()`s their contents — public key, preshared key, endpoint, counters — directly into the netlink reply returned to userspace, and the traversal off a stale stack-resident list head can dereference wild pointers, giving a broad kernel-memory read primitive.\nI:H - `down_read()`/`read_lock_bh()` on the freed and wild-pointer objects perform atomic read-modify-write operations on attacker-groomable memory, which combined with heap spraying of the reclaimed `wg_peer` slab yields an exploitable write primitive for control-flow hijacking.\nA:H - The maintainer's reproducer produces a KASAN slab-use-after-free with a corrupted rwsem acquisition; unmitigated this reliably oopses or panics the kernel, and a garbage lock value can also hang the dumping task indefinitely."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireguard/netlink.c"],"versions":[{"version":"e7096c131e5161fa3b8e52a650d7719d2857adfd","lessThan":"f52be46e3e6ecefc2539119784324f0cbc09620a","status":"affected","versionType":"git"},{"version":"e7096c131e5161fa3b8e52a650d7719d2857adfd","lessThan":"710a177f347282eea162aec8712beb1f42d5ad87","status":"affected","versionType":"git"},{"version":"e7096c131e5161fa3b8e52a650d7719d2857adfd","lessThan":"b7cea3a9af0853fdbb1b16633a458f991dde6aac","status":"affected","versionType":"git"},{"version":"e7096c131e5161fa3b8e52a650d7719d2857adfd","lessThan":"13d107794304306164481d31ce33f8fdb25a9c04","status":"affected","versionType":"git"},{"version":"e7096c131e5161fa3b8e52a650d7719d2857adfd","lessThan":"7bedfe4cfa38771840a355970e4437cd52d4046b","status":"affected","versionType":"git"},{"version":"e7096c131e5161fa3b8e52a650d7719d2857adfd","lessThan":"302b2dfc013baca3dea7ceda383930d9297d231d","status":"affected","versionType":"git"},{"version":"e7096c131e5161fa3b8e52a650d7719d2857adfd","lessThan":"55b6c738673871c9b0edae05d0c97995c1ff08c4","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/wireguard/netlink.c"],"versions":[{"version":"5.6","status":"affected"},{"version":"0","lessThan":"5.6","status":"unaffected","versionType":"semver"},{"version":"5.10.215","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.154","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.84","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.24","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.7.12","lessThanOrEqual":"6.7.*","status":"unaffected","versionType":"semver"},{"version":"6.8.3","lessThanOrEqual":"6.8.*","status":"unaffected","versionType":"semver"},{"version":"6.9","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.10.215"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"5.15.154"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.1.84"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.6.24"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.7.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.8.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.6","versionEndExcluding":"6.9"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/f52be46e3e6ecefc2539119784324f0cbc09620a"},{"url":"https://git.kernel.org/stable/c/710a177f347282eea162aec8712beb1f42d5ad87"},{"url":"https://git.kernel.org/stable/c/b7cea3a9af0853fdbb1b16633a458f991dde6aac"},{"url":"https://git.kernel.org/stable/c/13d107794304306164481d31ce33f8fdb25a9c04"},{"url":"https://git.kernel.org/stable/c/7bedfe4cfa38771840a355970e4437cd52d4046b"},{"url":"https://git.kernel.org/stable/c/302b2dfc013baca3dea7ceda383930d9297d231d"},{"url":"https://git.kernel.org/stable/c/55b6c738673871c9b0edae05d0c97995c1ff08c4"}],"title":"wireguard: 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