Answer in brief
CVE-2021-46992 records a High severity (CVSS 7.8) vulnerability in netfilter: nftables: avoid overflows in nft_hash_buckets(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2021-46992 records a High severity (CVSS 7.8) vulnerability in netfilter: nftables: avoid overflows in nft_hash_buckets(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <2824cafc6a93792d9ad85939c499161214d84c4b || >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <efcd730ddd6f25578bd31bfe703e593e2421d708 || >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <c77e2ef18167ad334e27610ced9a7f6af5ec1787 || >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <72b49dd116ca00a46a11d5a4d8d7987f05ed9cd7 || >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <1e8ab479cfbe5751efccedb95afb9b112a5ba475 || >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <a388d10961ff8578b1a6691945d406c0f33aa71b || >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <a54754ec9891830ba548e2010c889e3c8146e449 | 2824cafc6a93792d9ad85939c499161214d84c4b, efcd730ddd6f25578bd31bfe703e593e2421d708, c77e2ef18167ad334e27610ced9a7f6af5ec1787, 72b49dd116ca00a46a11d5a4d8d7987f05ed9cd7, 1e8ab479cfbe5751efccedb95afb9b112a5ba475, a388d10961ff8578b1a6691945d406c0f33aa71b, a54754ec9891830ba548e2010c889e3c8146e449 |
| Linux/Linuxgeneric | 4.9 | Not reported |
Published upstream
Feb 28, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <2824cafc6a93792d9ad85939c499161214d84c4b || >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <efcd730ddd6f25578bd31bfe703e593e2421d708 || >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <c77e2ef18167ad334e27610ced9a7f6af5ec1787 || >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <72b49dd116ca00a46a11d5a4d8d7987f05ed9cd7 || >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <1e8ab479cfbe5751efccedb95afb9b112a5ba475 || >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <a388d10961ff8578b1a6691945d406c0f33aa71b || >=0ed6389c483dc77cdbdd48de0ca7ce41723dd667 <a54754ec9891830ba548e2010c889e3c8146e449 | 2824cafc6a93792d9ad85939c499161214d84c4b, efcd730ddd6f25578bd31bfe703e593e2421d708, c77e2ef18167ad334e27610ced9a7f6af5ec1787, 72b49dd116ca00a46a11d5a4d8d7987f05ed9cd7, 1e8ab479cfbe5751efccedb95afb9b112a5ba475, a388d10961ff8578b1a6691945d406c0f33aa71b, a54754ec9891830ba548e2010c889e3c8146e449 |
| Linux/Linuxgeneric | 4.9 | Not reported |
Published upstream
Feb 28, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 4, 2026
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
Quoted source text, attributed separately from HOL analysis.