CVE-2021-47572— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
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，该漏洞源于存在空指针取消引用。
可能的 ATT&CK 技术 1 AI
T1053 · Scheduled Task/Job影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 53010f991a9f5e4ed2db705ddde6ff32709192a2< 7b6f44856da5ba0b1aa61403eb9fddd272156503 |
affected |
53010f991a9f5e4ed2db705ddde6ff32709192a2< b70ff391deeec35cdd8a05f5f63f5fe28bc4f225 |
affected | ||
53010f991a9f5e4ed2db705ddde6ff32709192a2< 39509d76a9a3d02f379d52cb4b1449469c56c0e0 |
affected | ||
53010f991a9f5e4ed2db705ddde6ff32709192a2< 1c743127cc54b112b155f434756bd4b5fa565a99 |
affected | ||
5.3 |
affected | ||
< 5.3 |
unaffected | ||
5.4.163≤ 5.4.* |
unaffected | ||
5.10.83≤ 5.10.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2021-47572 基础信息
漏洞信息
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Vulnerability Title
net: nexthop: fix null pointer dereference when IPv6 is not enabled
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
net: nexthop: fix null pointer dereference when IPv6 is not enabled
When we try to add an IPv6 nexthop and IPv6 is not enabled
(!CONFIG_IPV6) we'll hit a NULL pointer dereference[1] in the error path
of nh_create_ipv6() due to calling ipv6_stub->fib6_nh_release. The bug
has been present since the beginning of IPv6 nexthop gateway support.
Commit 1aefd3de7bc6 ("ipv6: Add fib6_nh_init and release to stubs") tells
us that only fib6_nh_init has a dummy stub because fib6_nh_release should
not be called if fib6_nh_init returns an error, but the commit below added
a call to ipv6_stub->fib6_nh_release in its error path. To fix it return
the dummy stub's -EAFNOSUPPORT error directly without calling
ipv6_stub->fib6_nh_release in nh_create_ipv6()'s error path.
[1]
Output is a bit truncated, but it clearly shows the error.
BUG: kernel NULL pointer dereference, address: 000000000000000000
#PF: supervisor instruction fetch in kernel modede
#PF: error_code(0x0010) - not-present pagege
PGD 0 P4D 0
Oops: 0010 [#1] PREEMPT SMP NOPTI
CPU: 4 PID: 638 Comm: ip Kdump: loaded Not tainted 5.16.0-rc1+ #446
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-4.fc34 04/01/2014
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffff888109f5b8f0 EFLAGS: 00010286^Ac
RAX: 0000000000000000 RBX: ffff888109f5ba28 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881008a2860
RBP: ffff888109f5b9d8 R08: 0000000000000000 R09: 0000000000000000
R10: ffff888109f5b978 R11: ffff888109f5b948 R12: 00000000ffffff9f
R13: ffff8881008a2a80 R14: ffff8881008a2860 R15: ffff8881008a2840
FS: 00007f98de70f100(0000) GS:ffff88822bf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000100efc000 CR4: 00000000000006e0
Call Trace:
<TASK>
nh_create_ipv6+0xed/0x10c
rtm_new_nexthop+0x6d7/0x13f3
? check_preemption_disabled+0x3d/0xf2
? lock_is_held_type+0xbe/0xfd
rtnetlink_rcv_msg+0x23f/0x26a
? check_preemption_disabled+0x3d/0xf2
? rtnl_calcit.isra.0+0x147/0x147
netlink_rcv_skb+0x61/0xb2
netlink_unicast+0x100/0x187
netlink_sendmsg+0x37f/0x3a0
? netlink_unicast+0x187/0x187
sock_sendmsg_nosec+0x67/0x9b
____sys_sendmsg+0x19d/0x1f9
? copy_msghdr_from_user+0x4c/0x5e
? rcu_read_lock_any_held+0x2a/0x78
___sys_sendmsg+0x6c/0x8c
? asm_sysvec_apic_timer_interrupt+0x12/0x20
? lockdep_hardirqs_on+0xd9/0x102
? sockfd_lookup_light+0x69/0x99
__sys_sendmsg+0x50/0x6e
do_syscall_64+0xcb/0xf2
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f98dea28914
Code: 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b5 0f 1f 80 00 00 00 00 48 8d 05 e9 5d 0c 00 8b 00 85 c0 75 13 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 54 c3 0f 1f 00 41 54 41 89 d4 55 48 89 f5 53
RSP: 002b:00007fff859f5e68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e2e
RAX: ffffffffffffffda RBX: 00000000619cb810 RCX: 00007f98dea28914
RDX: 0000000000000000 RSI: 00007fff859f5ed0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000008
R10: fffffffffffffce6 R11: 0000000000000246 R12: 0000000000000001
R13: 000055c0097ae520 R14: 000055c0097957fd R15: 00007fff859f63a0
</TASK>
Modules linked in: bridge stp llc bonding virtio_net
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
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，该漏洞源于存在空指针取消引用。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2021-47572 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2021-47572 其他参考 (3)
同批安全公告 · Linux · 2024-05-24 · 共 72 条
| CVE-2021-47544 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47506 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47536 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47520 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2023-52880 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47505 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47512 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47502 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47517 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47533 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47500 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47541 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47552 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47551 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47555 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47561 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47535 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47559 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47515 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47554 | Linux kernel 安全漏洞 |
显示前 20 条，共 72 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2021-47572
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