194 lines
13 KiB
JSON
194 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2021-47106",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-03-04T18:12:48.835Z",
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"datePublished": "2024-03-04T18:15:20.190Z",
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"dateUpdated": "2026-08-05T08:46:01.395Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:46:01.395Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: fix use-after-free in nft_set_catchall_destroy()\n\nWe need to use list_for_each_entry_safe() iterator\nbecause we can not access @catchall after kfree_rcu() call.\n\nsyzbot reported:\n\nBUG: KASAN: use-after-free in nft_set_catchall_destroy net/netfilter/nf_tables_api.c:4486 [inline]\nBUG: KASAN: use-after-free in nft_set_destroy net/netfilter/nf_tables_api.c:4504 [inline]\nBUG: KASAN: use-after-free in nft_set_destroy+0x3fd/0x4f0 net/netfilter/nf_tables_api.c:4493\nRead of size 8 at addr ffff8880716e5b80 by task syz-executor.3/8871\n\nCPU: 1 PID: 8871 Comm: syz-executor.3 Not tainted 5.16.0-rc5-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\n print_address_description.constprop.0.cold+0x8d/0x2ed mm/kasan/report.c:247\n __kasan_report mm/kasan/report.c:433 [inline]\n kasan_report.cold+0x83/0xdf mm/kasan/report.c:450\n nft_set_catchall_destroy net/netfilter/nf_tables_api.c:4486 [inline]\n nft_set_destroy net/netfilter/nf_tables_api.c:4504 [inline]\n nft_set_destroy+0x3fd/0x4f0 net/netfilter/nf_tables_api.c:4493\n __nft_release_table+0x79f/0xcd0 net/netfilter/nf_tables_api.c:9626\n nft_rcv_nl_event+0x4f8/0x670 net/netfilter/nf_tables_api.c:9688\n notifier_call_chain+0xb5/0x200 kernel/notifier.c:83\n blocking_notifier_call_chain kernel/notifier.c:318 [inline]\n blocking_notifier_call_chain+0x67/0x90 kernel/notifier.c:306\n netlink_release+0xcb6/0x1dd0 net/netlink/af_netlink.c:788\n __sock_release+0xcd/0x280 net/socket.c:649\n sock_close+0x18/0x20 net/socket.c:1314\n __fput+0x286/0x9f0 fs/file_table.c:280\n task_work_run+0xdd/0x1a0 kernel/task_work.c:164\n tracehook_notify_resume include/linux/tracehook.h:189 [inline]\n exit_to_user_mode_loop kernel/entry/common.c:175 [inline]\n exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207\n __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]\n syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300\n do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86\n entry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x7f75fbf28adb\nCode: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44\nRSP: 002b:00007ffd8da7ec10 EFLAGS: 00000293 ORIG_RAX: 0000000000000003\nRAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f75fbf28adb\nRDX: 00007f75fc08e828 RSI: ffffffffffffffff RDI: 0000000000000003\nRBP: 00007f75fc08a960 R08: 0000000000000000 R09: 00007f75fc08e830\nR10: 00007ffd8da7ed10 R11: 0000000000000293 R12: 00000000002067c3\nR13: 00007ffd8da7ed10 R14: 00007f75fc088f60 R15: 0000000000000032\n </TASK>\n\nAllocated by task 8886:\n kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38\n kasan_set_track mm/kasan/common.c:46 [inline]\n set_alloc_info mm/kasan/common.c:434 [inline]\n ____kasan_kmalloc mm/kasan/common.c:513 [inline]\n ____kasan_kmalloc mm/kasan/common.c:472 [inline]\n __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:522\n kasan_kmalloc include/linux/kasan.h:269 [inline]\n kmem_cache_alloc_trace+0x1ea/0x4a0 mm/slab.c:3575\n kmalloc include/linux/slab.h:590 [inline]\n nft_setelem_catchall_insert net/netfilter/nf_tables_api.c:5544 [inline]\n nft_setelem_insert net/netfilter/nf_tables_api.c:5562 [inline]\n nft_add_set_elem+0x232e/0x2f40 net/netfilter/nf_tables_api.c:5936\n nf_tables_newsetelem+0x6ff/0xbb0 net/netfilter/nf_tables_api.c:6032\n nfnetlink_rcv_batch+0x1710/0x25f0 net/netfilter/nfnetlink.c:513\n nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:634 [inline]\n nfnetlink_rcv+0x3af/0x420 net/netfilter/nfnetlink.c:652\n netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]\n netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345\n netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1921\n sock_sendmsg_nosec net/\n---truncated---"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is reached through nfnetlink/nftables netlink messages (NFT_MSG_NEWSETELEM then table/set teardown on socket close), which requires local syscall access rather than network packet delivery.\nAC:L - An attacker fully controls setup (create owned table/set with catch-all elements) and trigger (close the netfilter netlink socket or delete the set/table); no victim state or uncontrolled conditions are required.\nPR:L - nfnetlink checks CAP_NET_ADMIN via netlink_net_capable() against the network namespace's user_ns, so an unprivileged user with user+net namespaces can exercise this path without real root.\nUI:N - The attacker triggers the UAF entirely with their own netlink operations and socket close; no other user action is needed.\nS:U - Successful exploitation yields privilege escalation within the same kernel authority; it does not cross a VM/host or other security-authority boundary.\nC:H - Use-after-free of the kmalloc-64 nft_set_elem_catchall object enables reclaim and disclosure of freed object contents / adjacent kernel memory.\nI:H - Reclaiming the freed catchall lets the attacker control list linkage and catchall->elem, turning list_del_rcu/nft_set_elem_destroy into arbitrary write/free primitives for code execution.\nA:H - The UAF causes kernel oops/panic on invalid list walks and remains crashable even when not fully exploited for code execution."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/netfilter/nf_tables_api.c"
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],
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"version": "0",
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"versionType": "semver"
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},
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{
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"version": "5.15.12",
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"lessThanOrEqual": "5.15.*",
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{
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"version": "5.16",
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"lessThanOrEqual": "*",
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"timestamp": "2024-08-15T19:25:52.257046Z",
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"id": "CVE-2021-47106",
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"options": [
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