Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2024-38626
CVE-2024-38626:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2024-38626 is a vulnerability in the Linux kernel's FUSE (Filesystem in Userspace) implementation, discovered and reported by lee bruce. The issue was identified in version 6.9.0-rc7 and involves improper handling of the FR_SENT flag when re-adding requests into the pending list (Kernel Git).
Technical details
The vulnerability occurs in the FUSE filesystem handling and manifests through a specific sequence of events: 1) A fusedevread() call reads an INIT request and sets the FRSENT bit, 2) A fusedevwrite() call sends a FUSENOTIFYRESEND notify which moves the INIT request back to the pending list, 3) A subsequent fusedevread() with an invalid output address attempts to copy the INIT request, failing and triggering a warning in fuserequest_end() (Kernel Git).
Impact
The vulnerability can lead to system warnings and potential kernel instability when processing FUSE filesystem operations. The issue specifically affects the request handling mechanism in the FUSE implementation (Kernel Git).
Mitigation and workarounds
The issue has been fixed by clearing the FRSENT flag when re-adding requests into the pending list. The fix was implemented through a patch that adds a clearbit(FRSENT, &req->flags) operation in the fuseresend function (Kernel Git).
Additional resources
Source: This report was generated using AI
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