CVE-2021-46992— netfilter: nftables: avoid overflows in nft_hash_buckets()
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I. Basic Information for CVE-2021-46992
Vulnerability Information
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Vulnerability Title
netfilter: nftables: avoid overflows in nft_hash_buckets()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nftables: avoid overflows in nft_hash_buckets() Number of buckets being stored in 32bit variables, we have to ensure that no overflows occur in nft_hash_buckets() syzbot injected a size == 0x40000000 and reported: UBSAN: shift-out-of-bounds in ./include/linux/log2.h:57:13 shift exponent 64 is too large for 64-bit type 'long unsigned int' CPU: 1 PID: 29539 Comm: syz-executor.4 Not tainted 5.12.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:327 __roundup_pow_of_two include/linux/log2.h:57 [inline] nft_hash_buckets net/netfilter/nft_set_hash.c:411 [inline] nft_hash_estimate.cold+0x19/0x1e net/netfilter/nft_set_hash.c:652 nft_select_set_ops net/netfilter/nf_tables_api.c:3586 [inline] nf_tables_newset+0xe62/0x3110 net/netfilter/nf_tables_api.c:4322 nfnetlink_rcv_batch+0xa09/0x24b0 net/netfilter/nfnetlink.c:488 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:612 [inline] nfnetlink_rcv+0x3af/0x420 net/netfilter/nfnetlink.c:630 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于 nft_hash_buckets() 中存在溢出问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2021-46992
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Same Patch Batch · Linux · 2024-02-28 · 86 CVEs total
| CVE-2021-46997 | arm64: entry: always set GIC_PRIO_PSR_I_SET during entry | |
| CVE-2021-47001 | xprtrdma: Fix cwnd update ordering | |
| CVE-2021-46998 | ethernet:enic: Fix a use after free bug in enic_hard_start_xmit | |
| CVE-2021-47000 | ceph: fix inode leak on getattr error in __fh_to_dentry | |
| CVE-2021-47003 | dmaengine: idxd: Fix potential null dereference on pointer status | |
| CVE-2021-47005 | PCI: endpoint: Fix NULL pointer dereference for ->get_features() | |
| CVE-2021-47007 | f2fs: fix panic during f2fs_resize_fs() | |
| CVE-2021-47006 | ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook | |
| CVE-2021-47009 | KEYS: trusted: Fix memory leak on object td | |
| CVE-2021-47004 | f2fs: fix to avoid touching checkpointed data in get_victim() | |
| CVE-2021-46999 | sctp: do asoc update earlier in sctp_sf_do_dupcook_a | |
| CVE-2021-46995 | can: mcp251xfd: mcp251xfd_probe(): fix an error pointer dereference in probe | |
| CVE-2021-46996 | netfilter: nftables: Fix a memleak from userdata error path in new objects | |
| CVE-2021-46994 | can: mcp251x: fix resume from sleep before interface was brought up | |
| CVE-2021-46993 | sched: Fix out-of-bound access in uclamp | |
| CVE-2021-46990 | powerpc/64s: Fix crashes when toggling entry flush barrier | |
| CVE-2021-46991 | i40e: Fix use-after-free in i40e_client_subtask() | |
| CVE-2021-46989 | hfsplus: prevent corruption in shrinking truncate | |
| CVE-2021-46987 | btrfs: fix deadlock when cloning inline extents and using qgroups | |
| CVE-2021-46988 | userfaultfd: release page in error path to avoid BUG_ON |
Showing top 20 of 86 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
V. Comments for CVE-2021-46992
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