CVE-2024-42270

CVE Details

Release Date:

2024-08-17

Description

In the Linux kernel, the following vulnerability has been resolved:\nnetfilter: iptables: Fix null-ptr-deref in iptable_nat_table_init().\nWe had a report that iptables-restore sometimes triggered null-ptr-deref\nat boot time. [0]\nThe problem is that iptable_nat_table_init() is exposed to user space\nbefore the kernel fully initialises netns.\nIn the small race window, a user could call iptable_nat_table_init()\nthat accesses net_generic(net, iptable_nat_net_id), which is available\nonly after registering iptable_nat_net_ops.\nLet's call register_pernet_subsys() before xt_register_template().\n[0]:\nbpfilter: Loaded bpfilter_umh pid 11702\nStarted bpfilter\nBUG: kernel NULL pointer dereference, address: 0000000000000013\nPF: supervisor write access in kernel mode\nPF: error_code(0x0002) - not-present page\nPGD 0 P4D 0\nPREEMPT SMP NOPTI\nCPU: 2 PID: 11879 Comm: iptables-restor Not tainted 6.1.92-99.174.amzn2023.x86_64 #1\nHardware name: Amazon EC2 c6i.4xlarge/, BIOS 1.0 10/16/2017\nRIP: 0010:iptable_nat_table_init (net/ipv4/netfilter/iptable_nat.c:87 net/ipv4/netfilter/iptable_nat.c:121) iptable_nat\nCode: 10 4c 89 f6 48 89 ef e8 0b 19 bb ff 41 89 c4 85 c0 75 38 41 83 c7 01 49 83 c6 28 41 83 ff 04 75 dc 48 8b 44 24 08 48 8b 0c 24 <48> 89 08 4c 89 ef e8 a2 3b a2 cf 48 83 c4 10 44 89 e0 5b 5d 41 5c\nRSP: 0018:ffffbef902843cd0 EFLAGS: 00010246\nRAX: 0000000000000013 RBX: ffff9f4b052caa20 RCX: ffff9f4b20988d80\nRDX: 0000000000000000 RSI: 0000000000000064 RDI: ffffffffc04201c0\nRBP: ffff9f4b29394000 R08: ffff9f4b07f77258 R09: ffff9f4b07f77240\nR10: 0000000000000000 R11: ffff9f4b09635388 R12: 0000000000000000\nR13: ffff9f4b1a3c6c00 R14: ffff9f4b20988e20 R15: 0000000000000004\nFS: 00007f6284340000(0000) GS:ffff9f51fe280000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000000000000013 CR3: 00000001d10a6005 CR4: 00000000007706e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nPKRU: 55555554\nCall Trace:\n\n? show_trace_log_lvl (arch/x86/kernel/dumpstack.c:259)\n? show_trace_log_lvl (arch/x86/kernel/dumpstack.c:259)\n? xt_find_table_lock (net/netfilter/x_tables.c:1259)\n? __die_body.cold (arch/x86/kernel/dumpstack.c:478 arch/x86/kernel/dumpstack.c:420)\n? page_fault_oops (arch/x86/mm/fault.c:727)\n? exc_page_fault (./arch/x86/include/asm/irqflags.h:40 ./arch/x86/include/asm/irqflags.h:75 arch/x86/mm/fault.c:1470 arch/x86/mm/fault.c:1518)\n? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:570)\n? iptable_nat_table_init (net/ipv4/netfilter/iptable_nat.c:87 net/ipv4/netfilter/iptable_nat.c:121) iptable_nat\nxt_find_table_lock (net/netfilter/x_tables.c:1259)\nxt_request_find_table_lock (net/netfilter/x_tables.c:1287)\nget_info (net/ipv4/netfilter/ip_tables.c:965)\n? security_capable (security/security.c:809 (discriminator 13))\n? ns_capable (kernel/capability.c:376 kernel/capability.c:397)\n? do_ipt_get_ctl (net/ipv4/netfilter/ip_tables.c:1656)\n? bpfilter_send_req (net/bpfilter/bpfilter_kern.c:52) bpfilter\nnf_getsockopt (net/netfilter/nf_sockopt.c:116)\nip_getsockopt (net/ipv4/ip_sockglue.c:1827)\n__sys_getsockopt (net/socket.c:2327)\n__x64_sys_getsockopt (net/socket.c:2342 net/socket.c:2339 net/socket.c:2339)\ndo_syscall_64 (arch/x86/entry/common.c:51 arch/x86/entry/common.c:81)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\nRIP: 0033:0x7f62844685ee\nCode: 48 8b 0d 45 28 0f 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 0a c3 66 0f 1f 84 00 00 00 00 00 48 8b 15 09\nRSP: 002b:00007ffd1f83d638 EFLAGS: 00000246 ORIG_RAX: 0000000000000037\nRAX: ffffffffffffffda RBX: 00007ffd1f83d680 RCX: 00007f62844685ee\nRDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000004\nRBP: 0000000000000004 R08: 00007ffd1f83d670 R09: 0000558798ffa2a0\nR10: 00007ffd1f83d680 R11: 0000000000000246 R12: 00007ffd1f83e3b2\nR13: 00007f6284\n---truncated---

See more information about CVE-2024-42270 from MITRE CVE dictionary and NIST NVD

CVSS Scoring

NOTE: The following CVSS v3.1 metrics and score provided are preliminary and subject to review.

Base Score:	5.5	CVSS Vector:	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector:	Local network	Attack Complexity:	Low
Privileges Required:	Low	User Interaction:	None
Scope:	Unchanged	Confidentiality Impact:	None
Integrity Impact:	None	Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12796	2024-10-20
Oracle Linux version 8 (kernel-uek)	ELSA-2024-12830	2024-11-20
Oracle Linux version 9 (kernel-uek)	ELSA-2024-12796	2024-10-20
Oracle Linux version 9 (kernel-uek)	ELSA-2024-12830	2024-11-20