CVE-2024-26951 (GCVE-0-2024-26951)
Vulnerability from cvelistv5
Published
2024-05-01 05:18
Modified
2026-08-05 11:28
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: wireguard: netlink: check for dangling peer via is_dead instead of empty list If all peers are removed via wg_peer_remove_all(), rather than setting peer_list to empty, the peer is added to a temporary list with a head on the stack of wg_peer_remove_all(). If a netlink dump is resumed and the cursored peer is one that has been removed via wg_peer_remove_all(), it will iterate from that peer and then attempt to dump freed peers. Fix this by instead checking peer->is_dead, which was explictly created for this purpose. Also move up the device_update_lock lockdep assertion, since reading is_dead relies on that. It can be reproduced by a small script like: echo "Setting config..." ip link add dev wg0 type wireguard wg setconf wg0 /big-config ( while true; do echo "Showing config..." wg showconf wg0 > /dev/null done ) & sleep 4 wg setconf wg0 <(printf "[Peer]\nPublicKey=$(wg genkey)\n") Resulting in: BUG: KASAN: slab-use-after-free in __lock_acquire+0x182a/0x1b20 Read of size 8 at addr ffff88811956ec70 by task wg/59 CPU: 2 PID: 59 Comm: wg Not tainted 6.8.0-rc2-debug+ #5 Call Trace: <TASK> dump_stack_lvl+0x47/0x70 print_address_description.constprop.0+0x2c/0x380 print_report+0xab/0x250 kasan_report+0xba/0xf0 __lock_acquire+0x182a/0x1b20 lock_acquire+0x191/0x4b0 down_read+0x80/0x440 get_peer+0x140/0xcb0 wg_get_device_dump+0x471/0x1130
References
Impacted products
Vendor Product Version
Linux Linux Version: e7096c131e5161fa3b8e52a650d7719d2857adfd
Version: e7096c131e5161fa3b8e52a650d7719d2857adfd
Version: e7096c131e5161fa3b8e52a650d7719d2857adfd
Version: e7096c131e5161fa3b8e52a650d7719d2857adfd
Version: e7096c131e5161fa3b8e52a650d7719d2857adfd
Version: e7096c131e5161fa3b8e52a650d7719d2857adfd
Version: e7096c131e5161fa3b8e52a650d7719d2857adfd
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Per kernel scoring guidance, netlink-reachable bugs are Local.\\nAC:L - The attacker controls both sides of the race \\u2014 one thread runs the resumable dump while another issues a peer-replace \\u2014 and controls the peer count that forces multi-skb dump resumption, exactly as in the maintainer\u0027s shell-script reproducer. Nothing depends on conditions outside the attacker\u0027s influence.\\nPR:L - The ops use `GENL_UNS_ADMIN_PERM`, i.e. `netlink_ns_capable(skb, net-\u003euser_ns, CAP_NET_ADMIN)`, and the family is `netnsok`, so an unprivileged user can obtain the needed capability via `unshare -Urn` \\u2014 verified by successfully creating a WireGuard device in a user namespace as a normal user.\\nUI:N - Exploitation is entirely driven by the attacker\u0027s 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 \\u2014 public key, preshared key, endpoint, counters \\u2014 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\u0027s 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\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e7096c131e5161fa3b8e52a650d7719d2857adfd\", \"lessThan\": \"f52be46e3e6ecefc2539119784324f0cbc09620a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e7096c131e5161fa3b8e52a650d7719d2857adfd\", \"lessThan\": \"710a177f347282eea162aec8712beb1f42d5ad87\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e7096c131e5161fa3b8e52a650d7719d2857adfd\", \"lessThan\": \"b7cea3a9af0853fdbb1b16633a458f991dde6aac\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e7096c131e5161fa3b8e52a650d7719d2857adfd\", \"lessThan\": \"13d107794304306164481d31ce33f8fdb25a9c04\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e7096c131e5161fa3b8e52a650d7719d2857adfd\", \"lessThan\": \"7bedfe4cfa38771840a355970e4437cd52d4046b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e7096c131e5161fa3b8e52a650d7719d2857adfd\", \"lessThan\": \"302b2dfc013baca3dea7ceda383930d9297d231d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e7096c131e5161fa3b8e52a650d7719d2857adfd\", \"lessThan\": \"55b6c738673871c9b0edae05d0c97995c1ff08c4\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/net/wireguard/netlink.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.215\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.154\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.84\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.24\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.8.*\"}, {\"status\": \"unaffected\", \"version\": \"6.9\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/wireguard/netlink.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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-\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    ) \u0026\\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\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.215\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.154\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.84\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.24\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.7.12\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.8.3\", \"versionStartIncluding\": \"5.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.9\", \"versionStartIncluding\": \"5.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:28:32.058Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26951\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:28:32.058Z\", \"dateReserved\": \"2024-02-19T14:20:24.198Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-01T05:18:34.520Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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