netfilter: nftables: avoid overflows in nft_hash_buckets()
Summary
| CVE | CVE-2021-46992 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2024-02-28 09:15:37 UTC |
| Updated | 2026-08-04 10:16:40 UTC |
| 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 |
Risk And Classification
Primary CVSS: v3.1 7.1 HIGH from [email protected]
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Problem Types: CWE-125
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 7.1 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 7.8 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
NoneAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
NVD Known Affected Configurations (CPE 2.3)
| Type | Vendor | Product | Version | Update | Edition | Language |
|---|---|---|---|---|---|---|
| Operating System | Linux | Linux Kernel | All | All | All | All |
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 0ed6389c483dc77cdbdd48de0ca7ce41723dd667 2824cafc6a93792d9ad85939c499161214d84c4b git | Not specified |
| CNA | Linux | Linux | affected 0ed6389c483dc77cdbdd48de0ca7ce41723dd667 efcd730ddd6f25578bd31bfe703e593e2421d708 git | Not specified |
| CNA | Linux | Linux | affected 0ed6389c483dc77cdbdd48de0ca7ce41723dd667 c77e2ef18167ad334e27610ced9a7f6af5ec1787 git | Not specified |
| CNA | Linux | Linux | affected 0ed6389c483dc77cdbdd48de0ca7ce41723dd667 72b49dd116ca00a46a11d5a4d8d7987f05ed9cd7 git | Not specified |
| CNA | Linux | Linux | affected 0ed6389c483dc77cdbdd48de0ca7ce41723dd667 1e8ab479cfbe5751efccedb95afb9b112a5ba475 git | Not specified |
| CNA | Linux | Linux | affected 0ed6389c483dc77cdbdd48de0ca7ce41723dd667 a388d10961ff8578b1a6691945d406c0f33aa71b git | Not specified |
| CNA | Linux | Linux | affected 0ed6389c483dc77cdbdd48de0ca7ce41723dd667 a54754ec9891830ba548e2010c889e3c8146e449 git | Not specified |
| CNA | Linux | Linux | affected 4.9 | Not specified |
| CNA | Linux | Linux | unaffected 4.9 semver | Not specified |
| CNA | Linux | Linux | unaffected 4.14.233 4.14.* semver | Not specified |
| CNA | Linux | Linux | unaffected 4.19.191 4.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.4.120 5.4.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.38 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.11.22 5.11.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.12.5 5.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.13 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/c77e2ef18167ad334e27610ced9a7f6af5ec1787 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/efcd730ddd6f25578bd31bfe703e593e2421d708 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/2824cafc6a93792d9ad85939c499161214d84c4b | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/a54754ec9891830ba548e2010c889e3c8146e449 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/1e8ab479cfbe5751efccedb95afb9b112a5ba475 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/72b49dd116ca00a46a11d5a4d8d7987f05ed9cd7 | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| git.kernel.org/stable/c/a388d10961ff8578b1a6691945d406c0f33aa71b | af854a3a-2127-422b-91ae-364da2661108 | git.kernel.org | Patch |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.