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vuln-cve/data/2024/26xxx/CVE-2024-26951.json
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{
"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": "2026-10-15T00:39:32.705Z"
},
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"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"
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"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"
},
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{
"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."
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