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CVE-2024-44947— fuse: Initialize beyond-EOF page contents before setting uptodate

Quick assessment

Affected
Linux Linux
Exploitation
Public or AI PoC available; prioritize validation
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fuse_notify_store函数不启用页面清零。

AI Predicted 5.5 Difficulty: Hard EPSS 0.89% · P57

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a1d75f258230b75d46aecdf28b2e732413028863< 49934861514d36d0995be8e81bb3312a499d8d9a affected
a1d75f258230b75d46aecdf28b2e732413028863< 33168db352c7b56ae18aa55c2cae1a1c5905d30e affected
a1d75f258230b75d46aecdf28b2e732413028863< 4690e2171f651e2b415e3941ce17f2f7b813aff6 affected
a1d75f258230b75d46aecdf28b2e732413028863< 8c78303eafbf85a728dd84d1750e89240c677dd9 affected
a1d75f258230b75d46aecdf28b2e732413028863< 831433527773e665bdb635ab5783d0b95d1246f4 affected
a1d75f258230b75d46aecdf28b2e732413028863< ac42e0f0eb66af966015ee33fd355bc6f5d80cd6 affected
a1d75f258230b75d46aecdf28b2e732413028863< 18a067240817bee8a9360539af5d79a4bf5398a5 affected
a1d75f258230b75d46aecdf28b2e732413028863< 3c0da3d163eb32f1f91891efaade027fa9b245b9 affected
… +10 more rows
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I. Basic Information for CVE-2024-44947

Vulnerability Information
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Vulnerability Title
fuse: Initialize beyond-EOF page contents before setting uptodate
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fuse: Initialize beyond-EOF page contents before setting uptodate fuse_notify_store(), unlike fuse_do_readpage(), does not enable page zeroing (because it can be used to change partial page contents). So fuse_notify_store() must be more careful to fully initialize page contents (including parts of the page that are beyond end-of-file) before marking the page uptodate. The current code can leave beyond-EOF page contents uninitialized, which makes these uninitialized page contents visible to userspace via mmap(). This is an information leak, but only affects systems which do not enable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or the corresponding kernel command line parameter).
Source: CVE Program / CVE List V5
CVSS Information
N/A
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fuse_notify_store函数不启用页面清零。
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 a1d75f258230b75d46aecdf28b2e732413028863 ~ 49934861514d36d0995be8e81bb3312a499d8d9a -
Linux Linux 2.6.36 -

II. Public POCs for CVE-2024-44947

# POC Description Source Link Shenlong Link
1 None https://github.com/Abdurahmon3236/CVE-2024-44947 POC Details
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III. Intelligence Information for CVE-2024-44947

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Patches & Fixes for CVE-2024-44947 (8)

Vendor Advisories for CVE-2024-44947 (1)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-44947

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