CVE-2021-47162— 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tipc中存在释放后重用。
可能的 ATT&CK 技术 1 AI
T1211 · Exploitation for Stealth影响版本矩阵 22
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 45c8b7b175ceb2d542e0fe15247377bf3bce29ec< b2c8d28c34b3070407cb1741f9ba3f15d0284b8b |
affected |
45c8b7b175ceb2d542e0fe15247377bf3bce29ec< 5489f30bb78ff0dafb4229a69632afc2ba20765c |
affected | ||
45c8b7b175ceb2d542e0fe15247377bf3bce29ec< 436d650d374329a591c30339a91fa5078052ed1e |
affected | ||
45c8b7b175ceb2d542e0fe15247377bf3bce29ec< 4b1761898861117c97066aea6c58f68a7787f0bf |
affected | ||
45c8b7b175ceb2d542e0fe15247377bf3bce29ec< 64d17ec9f1ded042c4b188d15734f33486ed9966 |
affected | ||
45c8b7b175ceb2d542e0fe15247377bf3bce29ec< 6da24cfc83ba4f97ea44fc7ae9999a006101755c |
affected | ||
45c8b7b175ceb2d542e0fe15247377bf3bce29ec< ace300eecbccaa698e2b472843c74a5f33f7dce8 |
affected | ||
45c8b7b175ceb2d542e0fe15247377bf3bce29ec< b7df21cf1b79ab7026f545e7bf837bd5750ac026 |
affected | ||
| … +14 条更多 | |||
获取后续新漏洞提醒
登录后订阅
一、 漏洞 CVE-2021-47162 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
查看神龙十问 ↗
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
tipc: skb_linearize the head skb when reassembling msgs
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
tipc: skb_linearize the head skb when reassembling msgs
It's not a good idea to append the frag skb to a skb's frag_list if
the frag_list already has skbs from elsewhere, such as this skb was
created by pskb_copy() where the frag_list was cloned (all the skbs
in it were skb_get'ed) and shared by multiple skbs.
However, the new appended frag skb should have been only seen by the
current skb. Otherwise, it will cause use after free crashes as this
appended frag skb are seen by multiple skbs but it only got skb_get
called once.
The same thing happens with a skb updated by pskb_may_pull() with a
skb_cloned skb. Li Shuang has reported quite a few crashes caused
by this when doing testing over macvlan devices:
[] kernel BUG at net/core/skbuff.c:1970!
[] Call Trace:
[] skb_clone+0x4d/0xb0
[] macvlan_broadcast+0xd8/0x160 [macvlan]
[] macvlan_process_broadcast+0x148/0x150 [macvlan]
[] process_one_work+0x1a7/0x360
[] worker_thread+0x30/0x390
[] kernel BUG at mm/usercopy.c:102!
[] Call Trace:
[] __check_heap_object+0xd3/0x100
[] __check_object_size+0xff/0x16b
[] simple_copy_to_iter+0x1c/0x30
[] __skb_datagram_iter+0x7d/0x310
[] __skb_datagram_iter+0x2a5/0x310
[] skb_copy_datagram_iter+0x3b/0x90
[] tipc_recvmsg+0x14a/0x3a0 [tipc]
[] ____sys_recvmsg+0x91/0x150
[] ___sys_recvmsg+0x7b/0xc0
[] kernel BUG at mm/slub.c:305!
[] Call Trace:
[] <IRQ>
[] kmem_cache_free+0x3ff/0x400
[] __netif_receive_skb_core+0x12c/0xc40
[] ? kmem_cache_alloc+0x12e/0x270
[] netif_receive_skb_internal+0x3d/0xb0
[] ? get_rx_page_info+0x8e/0xa0 [be2net]
[] be_poll+0x6ef/0xd00 [be2net]
[] ? irq_exit+0x4f/0x100
[] net_rx_action+0x149/0x3b0
...
This patch is to fix it by linearizing the head skb if it has frag_list
set in tipc_buf_append(). Note that we choose to do this before calling
skb_unshare(), as __skb_linearize() will avoid skb_copy(). Also, we can
not just drop the frag_list either as the early time.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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tipc中存在释放后重用。
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-2021-47162 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
登录以生成 AI POC三、漏洞 CVE-2021-47162 的情报信息
请登录查看更多情报信息。
CVE-2021-47162 其他参考 (6)
同批安全公告 · Linux · 2024-03-25 · 共 40 条
| CVE-2021-47137 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47168 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2021-47136 | 8.6 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47160 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47142 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47148 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47175 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47163 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47152 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47153 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47158 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47159 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47179 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47178 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2021-47173 | Linux kernel 安全漏洞 | |
| CVE-2021-47138 | Linux kernel 安全漏洞 | |
| CVE-2021-47169 | Linux kernel 安全漏洞 | |
| CVE-2021-47170 | Linux kernel 安全漏洞 | |
| CVE-2021-47171 | Linux kernel 安全漏洞 | |
| CVE-2021-47172 | Linux kernel 安全漏洞 |
显示前 20 条，共 40 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2021-47162
暂无评论