{ "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 \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: netlink: check for dangling peer via is_dead instead of empty list", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": 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