Cloud Vulnerability DB
An open project to list all known cloud vulnerabilities and Cloud Service Provider security issues
Vulnerability DatabaseCVE-2024-26786
CVE-2024-26786:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2024-26786 is a vulnerability in the Linux kernel's IOMMU subsystem, specifically in the iommufd component. The issue was discovered when Syzkaller reported a WARNON condition in the iopagetable.c file. The vulnerability stems from a mismatch between the access pointer in the list and the passed-in pointer, resulting from an overwrite of access->ioptaccesslistid in the ioptadd_access() function (Kernel Commit).
Technical details
The vulnerability occurs when xaalloc() succeeds but ioptcalculateiovaalignment() fails in iommufdaccesschangeioas(). The bug manifests as an overwrite of the ioptaccesslistid field. According to CISA's assessment, this vulnerability has been assigned a CVSS v3.1 Base Score of 5.5 (MEDIUM) with vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (NVD).
Impact
The vulnerability can lead to a system warning and potential system instability. The CVSS scoring indicates that while the vulnerability requires local access and low privileges, it can have a high impact on system availability (CISA-ADP).
Mitigation and workarounds
The issue has been fixed in the Linux kernel through a patch that introduces a newid variable in ioptaddaccess() and only updates ioptaccesslistid when returning successfully. The fix has been committed to the kernel repository and is available in updated versions (Kernel Commit).
Additional resources
Source: This report was generated using AI
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