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CVE-2024-50263— 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，该漏洞源于在错误的情况下调用 khugepaged、ksm。

CVSS 7.8 · High EPSS 0.21% · P11

影响版本矩阵 6

厂商产品 版本范围状态
Linux Linux d2406291483775ecddaee929231a39c70c08fda2< 3b85aa0da8cd01173b9afd1f70080fbb9576c4b0 affected
d2406291483775ecddaee929231a39c70c08fda2< 985da552a98e27096444508ce5d853244019111f affected
6.8 affected
< 6.8 unaffected
6.11.7≤ 6.11.* unaffected
6.12≤ * unaffected
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一、 漏洞 CVE-2024-50263 基础信息

漏洞信息
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Vulnerability Title
fork: only invoke khugepaged, ksm hooks if no error
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fork: only invoke khugepaged, ksm hooks if no error There is no reason to invoke these hooks early against an mm that is in an incomplete state. 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. Their placement early in dup_mmap() only appears to have been meaningful for early error checking, and since functionally it'd require a very small allocation to fail (in practice 'too small to fail') that'd only occur in the most dire circumstances, meaning the fork would fail or be OOM'd in any case. Since both khugepaged and KSM tracking are there to provide optimisations to memory performance rather than critical functionality, it doesn't really matter all that much if, under such dire memory pressure, we fail to register an mm with these. As a result, we follow the example of commit d2081b2bf819 ("mm: khugepaged: make khugepaged_enter() void function") and make ksm_fork() a void function also. We only expose the mm to these functions once we are done with them and only if no error occurred in the fork operation.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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，该漏洞源于在错误的情况下调用 khugepaged、ksm。
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

厂商 产品 影响版本 CPE 订阅
Linux Linux d2406291483775ecddaee929231a39c70c08fda2 ~ 3b85aa0da8cd01173b9afd1f70080fbb9576c4b0 -
Linux Linux 6.8 -

二、漏洞 CVE-2024-50263 的公开POC

# POC 描述 源链接 神龙链接
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三、漏洞 CVE-2024-50263 的情报信息

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CVE-2024-50263 厂商安全公告 (1)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-50263

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