Bug 2266423 (CVE-2021-46915) - CVE-2021-46915 kernel: netfilter: divide error in nft_limit_init
Summary: CVE-2021-46915 kernel: netfilter: divide error in nft_limit_init
Keywords:
Status: NEW
Alias: CVE-2021-46915
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2266424
Blocks: 2266369
TreeView+ depends on / blocked
 
Reported: 2024-02-27 19:21 UTC by Rohit Keshri
Modified: 2024-04-30 14:59 UTC (History)
51 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
A denial of service flaw was found in nft_limit_init in netfilter's nft_limit in the Linux Kernel. This issue occurs due to an inappropriate math function selection, which may cause an availability threat.
Clone Of:
Environment:
Last Closed:
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2024:2006 0 None None None 2024-04-23 16:39:52 UTC
Red Hat Product Errata RHSA-2024:2008 0 None None None 2024-04-23 16:28:23 UTC
Red Hat Product Errata RHSA-2024:2582 0 None None None 2024-04-30 14:59:46 UTC
Red Hat Product Errata RHSA-2024:2585 0 None None None 2024-04-30 14:46:10 UTC

Description Rohit Keshri 2024-02-27 19:21:24 UTC 
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

https://git.kernel.org/stable/c/01fb1626b620cb37a65ad08e0f626489e8f042ef
https://git.kernel.org/stable/c/1bb3ee4259936cc3b2d80a4a480bbb4868575071
https://git.kernel.org/stable/c/9065ccb9ec92c5120e7e97958397ebdb454f23d6
https://git.kernel.org/stable/c/b895bdf5d643b6feb7c60856326dd4feb6981560
https://git.kernel.org/stable/c/dc1732baa9da5b68621586bf8636ebbc27dc62d2
https://git.kernel.org/stable/c/fadd3c4afdf3d4c21f4d138502f8b76334987e26
Comment 1 Rohit Keshri 2024-02-27 19:24:01 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2266424]
Comment 3 Justin M. Forbes 2024-02-27 23:07:40 UTC 
This was fixed for Fedora with the 5.11.16 stable kernel updates.
Comment 8 errata-xmlrpc 2024-04-23 16:28:20 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Telecommunications Update Service

Via RHSA-2024:2008 https://access.redhat.com/errata/RHSA-2024:2008
Comment 9 errata-xmlrpc 2024-04-23 16:39:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.2 Advanced Update Support
  Red Hat Enterprise Linux 8.2 Telecommunications Update Service
  Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions

Via RHSA-2024:2006 https://access.redhat.com/errata/RHSA-2024:2006
Comment 10 errata-xmlrpc 2024-04-30 14:46:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Telecommunications Update Service
  Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions

Via RHSA-2024:2585 https://access.redhat.com/errata/RHSA-2024:2585
Comment 11 errata-xmlrpc 2024-04-30 14:59:43 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Telecommunications Update Service
  Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions

Via RHSA-2024:2582 https://access.redhat.com/errata/RHSA-2024:2582
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