CVE-2024-50220— 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，该漏洞源于存在错误发生时uffd调用问题。
可能的 ATT&CK 技术 1 AI
T1055 · Process Injection
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一、 漏洞 CVE-2024-50220 基础信息
漏洞信息
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Vulnerability Title
fork: do not invoke uffd on fork if error occurs
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
fork: do not invoke uffd on fork if error occurs
Patch series "fork: do not expose incomplete mm on fork".
During fork we may place the virtual memory address space into an
inconsistent state before the fork operation is complete.
In addition, we may encounter an error during the fork operation that
indicates that the virtual memory address space is invalidated.
As a result, we should not be exposing it in any way to external machinery
that might interact with the mm or VMAs, machinery that is not designed to
deal with incomplete state.
We specifically update the fork logic to defer khugepaged and ksm to the
end of the operation and only to be invoked if no error arose, and
disallow uffd from observing fork events should an error have occurred.
This patch (of 2):
Currently on fork we expose the virtual address space of a process to
userland unconditionally if uffd is registered in VMAs, regardless of
whether an error arose in the fork.
This is performed in dup_userfaultfd_complete() which is invoked
unconditionally, and performs two duties - invoking registered handlers
for the UFFD_EVENT_FORK event via dup_fctx(), and clearing down
userfaultfd_fork_ctx objects established in dup_userfaultfd().
This is problematic, because the virtual address space may not yet be
correctly initialised if an error arose.
The change in commit d24062914837 ("fork: use __mt_dup() to duplicate
maple tree in dup_mmap()") makes this more pertinent as we may be in a
state where entries in the maple tree are not yet consistent.
We address this by, on fork error, ensuring that we roll back state that
we would otherwise expect to clean up through the event being handled by
userland and perform the memory freeing duty otherwise performed by
dup_userfaultfd_complete().
We do this by implementing a new function, dup_userfaultfd_fail(), which
performs the same loop, only decrementing reference counts.
Note that we perform mmgrab() on the parent and child mm's, however
userfaultfd_ctx_put() will mmdrop() this once the reference count drops to
zero, so we will avoid memory leaks correctly here.
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，该漏洞源于存在错误发生时uffd调用问题。
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-2024-50220 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2024-50220 补丁与修复 (2)
CVE-2024-50220 厂商安全公告 (1)
同批安全公告 · Linux · 2024-11-09 · 共 49 条
| CVE-2024-50215 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50225 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50217 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50221 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50262 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50261 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50246 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50230 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50253 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50237 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50250 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50235 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50256 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50241 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50247 | 7.3 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50248 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50257 | 7.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50222 | 7.0 HIGH | Linux kernel 安全漏洞 |
| CVE-2024-50245 | Linux kernel 安全漏洞 | |
| CVE-2024-50239 | Linux kernel 安全漏洞 |
显示前 20 条，共 49 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2024-50220
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