CVE-2021-46915— netfilter: nft_limit: avoid possible divide error in nft_limit_init
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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_limit_init 中存在除法错误。
Affected Version Matrix 14
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | c26844eda9d4fdbd266660e3b3de2d0270e3a1ed< 9065ccb9ec92c5120e7e97958397ebdb454f23d6 |
affected |
c26844eda9d4fdbd266660e3b3de2d0270e3a1ed< fadd3c4afdf3d4c21f4d138502f8b76334987e26 |
affected | ||
c26844eda9d4fdbd266660e3b3de2d0270e3a1ed< 01fb1626b620cb37a65ad08e0f626489e8f042ef |
affected | ||
c26844eda9d4fdbd266660e3b3de2d0270e3a1ed< dc1732baa9da5b68621586bf8636ebbc27dc62d2 |
affected | ||
c26844eda9d4fdbd266660e3b3de2d0270e3a1ed< 1bb3ee4259936cc3b2d80a4a480bbb4868575071 |
affected | ||
c26844eda9d4fdbd266660e3b3de2d0270e3a1ed< b895bdf5d643b6feb7c60856326dd4feb6981560 |
affected | ||
4.13 |
affected | ||
< 4.13 |
unaffected | ||
| … +6 more rows | |||
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I. Basic Information for CVE-2021-46915
Vulnerability Information
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Vulnerability Title
netfilter: nft_limit: avoid possible divide error in nft_limit_init
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_limit: avoid possible divide error in nft_limit_init
div_u64() divides u64 by u32.
nft_limit_init() wants to divide u64 by u64, use the appropriate
math function (div64_u64)
divide error: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 8390 Comm: syz-executor188 Not tainted 5.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:div_u64_rem include/linux/math64.h:28 [inline]
RIP: 0010:div_u64 include/linux/math64.h:127 [inline]
RIP: 0010:nft_limit_init+0x2a2/0x5e0 net/netfilter/nft_limit.c:85
Code: ef 4c 01 eb 41 0f 92 c7 48 89 de e8 38 a5 22 fa 4d 85 ff 0f 85 97 02 00 00 e8 ea 9e 22 fa 4c 0f af f3 45 89 ed 31 d2 4c 89 f0 <49> f7 f5 49 89 c6 e8 d3 9e 22 fa 48 8d 7d 48 48 b8 00 00 00 00 00
RSP: 0018:ffffc90009447198 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000200000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff875152e6 RDI: 0000000000000003
RBP: ffff888020f80908 R08: 0000200000000000 R09: 0000000000000000
R10: ffffffff875152d8 R11: 0000000000000000 R12: ffffc90009447270
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 000000000097a300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000200001c4 CR3: 0000000026a52000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
nf_tables_newexpr net/netfilter/nf_tables_api.c:2675 [inline]
nft_expr_init+0x145/0x2d0 net/netfilter/nf_tables_api.c:2713
nft_set_elem_expr_alloc+0x27/0x280 net/netfilter/nf_tables_api.c:5160
nf_tables_newset+0x1997/0x3150 net/netfilter/nf_tables_api.c:4321
nfnetlink_rcv_batch+0x85a/0x21b0 net/netfilter/nfnetlink.c:456
nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:580 [inline]
nfnetlink_rcv+0x3af/0x420 net/netfilter/nfnetlink.c:598
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
entry_SYSCALL_64_after_hwframe+0x44/0xae
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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_limit_init 中存在除法错误。
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-2021-46915
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2021-46915 (6)
Same Patch Batch · Linux · 2024-02-27 · 67 CVEs total
| CVE-2021-46911 | 9.8 CRITICAL | ch_ktls: Fix kernel panic |
| CVE-2021-46955 | 8.2 HIGH | openvswitch: fix stack OOB read while fragmenting IPv4 packets |
| CVE-2021-46963 | 7.8 HIGH | scsi: qla2xxx: Fix crash in qla2xxx_mqueuecommand() |
| CVE-2021-46929 | 7.8 HIGH | sctp: use call_rcu to free endpoint |
| CVE-2021-46925 | 7.8 HIGH | net/smc: fix kernel panic caused by race of smc_sock |
| CVE-2021-46913 | 7.8 HIGH | netfilter: nftables: clone set element expression template |
| CVE-2021-46973 | 7.8 HIGH | net: qrtr: Avoid potential use after free in MHI send |
| CVE-2021-46936 | 7.8 HIGH | net: fix use-after-free in tw_timer_handler |
| CVE-2021-46958 | 7.8 HIGH | btrfs: fix race between transaction aborts and fsyncs leading to use-after-free |
| CVE-2021-46969 | 7.8 HIGH | bus: mhi: core: Fix invalid error returning in mhi_queue |
| CVE-2021-46933 | 7.8 HIGH | usb: gadget: f_fs: Clear ffs_eventfd in ffs_data_clear. |
| CVE-2021-46921 | 7.8 HIGH | locking/qrwlock: Fix ordering in queued_write_lock_slowpath() |
| CVE-2021-46922 | 7.8 HIGH | KEYS: trusted: Fix TPM reservation for seal/unseal |
| CVE-2021-46967 | 7.8 HIGH | vhost-vdpa: fix vm_flags for virtqueue doorbell mapping |
| CVE-2021-46948 | 7.5 HIGH | sfc: farch: fix TX queue lookup in TX event handling |
| CVE-2021-46960 | 7.5 HIGH | cifs: Return correct error code from smb2_get_enc_key |
| CVE-2021-46912 | 7.3 HIGH | net: Make tcp_allowed_congestion_control readonly in non-init netns |
| CVE-2021-46908 | 7.1 HIGH | bpf: Use correct permission flag for mixed signed bounds arithmetic |
| CVE-2021-46974 | 7.1 HIGH | bpf: Fix masking negation logic upon negative dst register |
| CVE-2021-46910 | 7.0 HIGH | ARM: 9063/1: mm: reduce maximum number of CPUs if DEBUG_KMAP_LOCAL is enabled |
Showing top 20 of 67 CVEs. View all on vendor page → →
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V. Comments for CVE-2021-46915
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