Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2024-53234
CVE-2024-53234:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2024-53234 affects the Linux kernel's EROFS (Enhanced Read-Only File System) implementation. The vulnerability was discovered on December 27, 2024, and involves improper handling of NONHEAD !delta[1] lclusters. This issue specifically affects filesystems created by pre-1.0 mkfs versions and crafted images (NVD).
Technical details
The vulnerability occurs in the EROFS filesystem's handling of NONHEAD lclusters where delta[1]0. The issue manifests as a WARNING in iomapiterdone (iomapfiemap+0x73b/0x9b0 fs/iomap/fiemap.c:80 ioctlfiemap fs/ioctl.c:220). When encountering delta[1]0, the system would immediately bail out, resulting in inadequate decompressed lengths affecting FIEMAP functionality. Additionally, the vulnerability includes an issue where 'lclusterbits > 14' is considered illegal for compact indexes (Kernel Commit).
Impact
The vulnerability affects the FIEMAP (File Extent Map) functionality in the Linux kernel, potentially leading to inadequate decompressed lengths when handling certain filesystem operations. This primarily impacts systems using EROFS with filesystems created by pre-1.0 mkfs versions or when processing crafted images (Ubuntu Security).
Mitigation and workarounds
The issue has been fixed in the Linux kernel through a patch that implements a workaround by treating delta[1]==0 as delta[1]=1 for NONHEAD lclusters. The fix also includes proper error handling for cases where lclusterbits > 14 in compact indexes. Various Linux distributions have released updates incorporating this fix, including Ubuntu 24.10 (oracular) which has been fixed in version 6.11.0-18.18 (Ubuntu Security).
Additional resources
Source: This report was generated using AI
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