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TI-2021-21582 Aliases CVE-2021-46915GHSA-99vg-6g53-53wq

netfilter: nft_limit: avoid possible divide error in nft_limit_init

Priority LOW 24CWE-369Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 10 fixed, 3 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-369.

Summary

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

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00241 15th percentileScored 2026-11-07
Fix Partial Linux (Linux): 4.14.232, 4.19.189, 5.4.114 +3Red Hat: 4 advisoriesRed Hat: 10 fixed, 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
LinuxLinux4.13 and later4.14.232, 4.19.189, 5.4.114, 5.10.32, 5.11.16, 5.12Patch availableCNA
  • Linux VendorLinux Affected 4.13 and later Fixed in 4.14.232, 4.19.189, 5.4.114, 5.10.32, 5.11.16, 5.12 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*4.13.0 to before 4.14.232; 4.15.0 to before 4.19.189; 4.20.0 to before 5.4.114; 5.5.0 to before 5.10.32; 5.11.0 to before 5.11.16VulnerableLinux
  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.13.0 to before 4.14.232; 4.15.0 to before 4.19.189; 4.20.0 to before 5.4.114; 5.5.0 to before 5.10.32; 5.11.0 to before 5.11.16 Vulnerable ·Linux

Remediation

  • Fix · CNA Linux (Linux) Fixed in 4.14.232, 4.19.189, 5.4.114, 5.10.32, 5.11.16, 5.12

Red Hat 4 advisories

  • RHSA-2024:2582 Released 2024-04-30 · Red Hat rating Moderate
    kernel security and bug fix update
    • Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.130.1.el8_4, kernel-4.18.0-305.130.1.el8_4, kernel-abi-stablelists-4.18.0-305.130.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS E4S (v.8.4) bpftool-4.18.0-305.130.1.el8_4, kernel-4.18.0-305.130.1.el8_4, kernel-abi-stablelists-4.18.0-305.130.1.el8_4 +14
    • Red Hat Enterprise Linux BaseOS TUS (v.8.4) bpftool-4.18.0-305.130.1.el8_4, kernel-4.18.0-305.130.1.el8_4, kernel-abi-stablelists-4.18.0-305.130.1.el8_4 +14
  • RHSA-2024:2585 Released 2024-04-30 · Red Hat rating Moderate
    kernel-rt security and bug fix update
    • Red Hat Enterprise Linux NFV TUS (v.8.4) kernel-rt-4.18.0-305.130.1.rt7.206.el8_4, kernel-rt-core-4.18.0-305.130.1.rt7.206.el8_4, kernel-rt-debug-4.18.0-305.130.1.rt7.206.el8_4 +9
    • Red Hat Enterprise Linux RT TUS (v.8.4) kernel-rt-4.18.0-305.130.1.rt7.206.el8_4, kernel-rt-core-4.18.0-305.130.1.rt7.206.el8_4, kernel-rt-debug-4.18.0-305.130.1.rt7.206.el8_4 +7
  • RHSA-2024:2006 Released 2024-04-23 · Red Hat rating Important
    kernel security and bug fix update
    • Red Hat Enterprise Linux BaseOS AUS (v. 8.2) bpftool-4.18.0-193.133.1.el8_2, kernel-4.18.0-193.133.1.el8_2, kernel-abi-whitelists-4.18.0-193.133.1.el8_2 +14
    • Red Hat Enterprise Linux BaseOS E4S (v. 8.2) bpftool-4.18.0-193.133.1.el8_2, kernel-4.18.0-193.133.1.el8_2, kernel-abi-whitelists-4.18.0-193.133.1.el8_2 +14
    • Red Hat Enterprise Linux BaseOS TUS (v. 8.2) bpftool-4.18.0-193.133.1.el8_2, kernel-4.18.0-193.133.1.el8_2, kernel-abi-whitelists-4.18.0-193.133.1.el8_2 +14
Show 1 more Red Hat advisories
  • RHSA-2024:2008 Released 2024-04-23 · Red Hat rating Important
    kernel-rt security update
    • Red Hat Enterprise Linux Real Time TUS (v. 8.2) kernel-rt-4.18.0-193.133.1.rt13.184.el8_2, kernel-rt-core-4.18.0-193.133.1.rt13.184.el8_2, kernel-rt-debug-4.18.0-193.133.1.rt13.184.el8_2 +7
    • Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2) kernel-rt-4.18.0-193.133.1.rt13.184.el8_2, kernel-rt-core-4.18.0-193.133.1.rt13.184.el8_2, kernel-rt-debug-4.18.0-193.133.1.rt13.184.el8_2 +9

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux BaseOS AUS (v. 8.2)Fixed RHSA-2024:2006
Red Hat Enterprise Linux BaseOS AUS (v.8.4)Fixed RHSA-2024:2582
Red Hat Enterprise Linux BaseOS E4S (v. 8.2)Fixed RHSA-2024:2006
Red Hat Enterprise Linux BaseOS E4S (v.8.4)Fixed RHSA-2024:2582
Red Hat Enterprise Linux BaseOS TUS (v. 8.2)Fixed RHSA-2024:2006
Red Hat Enterprise Linux BaseOS TUS (v.8.4)Fixed RHSA-2024:2582
Red Hat Enterprise Linux NFV TUS (v.8.4)Fixed RHSA-2024:2585
Red Hat Enterprise Linux RT TUS (v.8.4)Fixed RHSA-2024:2585
Red Hat Enterprise Linux Real Time TUS (v. 8.2)Fixed RHSA-2024:2008
Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)Fixed RHSA-2024:2008
Not affected: 1 product
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-46915
  2. 2026-10-03 Alias added: GHSA-99vg-6g53-53wq

References

Patch 6

  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-38352 netfilter: bridge: make ebt_snat ARP rewrite writable KEVCVSS 3.1HIGH 8.8
  • TI-2013-05264 The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the… KEVCVSS 3.1HIGH 8.8
  • TI-2022-00125 Integer overflow in kernel KEVCVSS 3.1HIGH 8.4
  • TI-2013-01864 The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9… KEVCVSS 3.1HIGH 8.4
  • TI-2021-05514 Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACE KEVCVSS 3.1HIGH 8.3
See all 15278 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences