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CVE-2024-50263— fork: only invoke khugepaged, ksm hooks if no error

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 6

VendorProduct Version RangeStatus
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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I. Basic Information for CVE-2024-50263

Vulnerability Information
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Vulnerability Title
fork: only invoke khugepaged, ksm hooks if no error
Source: 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.
Source: 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
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux d2406291483775ecddaee929231a39c70c08fda2 ~ 3b85aa0da8cd01173b9afd1f70080fbb9576c4b0 -
Linux Linux 6.8 -

II. Public POCs for CVE-2024-50263

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III. Intelligence Information for CVE-2024-50263

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Vendor Advisories for CVE-2024-50263 (1)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-50263

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