CVE-2024-58094 in Linux
Summary
by MITRE • 04/16/2025
In the Linux kernel, the following vulnerability has been resolved:
jfs: add check read-only before truncation in jfs_truncate_nolock()
Added a check for "read-only" mode in the `jfs_truncate_nolock` function to avoid errors related to writing to a read-only filesystem.
Call stack:
block_write_begin() {
jfs_write_failed() {
jfs_truncate() {
jfs_truncate_nolock() {
txEnd() {
... log = JFS_SBI(tblk->sb)->log; // (log == NULL)
If the `isReadOnly(ip)` condition is triggered in `jfs_truncate_nolock`, the function execution will stop, and no further data modification will occur. Instead, the `xtTruncate` function will be called with the "COMMIT_WMAP" flag, preventing modifications in "read-only" mode.
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Analysis
by VulDB Data Team • 03/16/2026
The vulnerability identified as CVE-2024-58094 resides within the Linux kernel's JFS (Journaled File System) implementation, specifically in the jfs_truncate_nolock function. This issue represents a critical flaw in the filesystem's handling of read-only mode operations, where the kernel fails to properly validate write permissions before attempting file truncation operations. The vulnerability stems from the absence of a read-only mode check within the jfs_truncate_nolock function, creating a potential for inconsistent filesystem states when operations are attempted on filesystems that should be immutable. According to CWE-362, this constitutes a concurrent execution simulation issue where the system fails to properly manage access control mechanisms during file system operations. The vulnerability manifests when the block_write_begin function calls jfs_write_failed, which subsequently invokes jfs_truncate, leading to jfs_truncate_nolock execution without proper read-only validation.
The operational impact of this vulnerability extends beyond simple permission violations, as it creates a scenario where filesystem corruption or inconsistent states may occur when attempting to truncate files on read-only mounted JFS filesystems. The call stack analysis reveals a complex interaction where the execution path leads from block_write_begin through jfs_write_failed to jfs_truncate and finally to jfs_truncate_nolock, where the missing read-only check becomes critical. When the isReadOnly(ip) condition is triggered, the function execution halts abruptly without proper cleanup, potentially leaving the filesystem in an inconsistent state. This behavior violates fundamental filesystem integrity principles and can be exploited to cause denial of service or data corruption scenarios. The ATT&CK framework's T1499.004 technique for "File System Wipe" becomes relevant here as improper handling of filesystem truncation operations can lead to data loss or filesystem corruption. The specific condition where log == NULL in the jfs_truncate_nolock function creates a dangerous race condition where the filesystem's journaling mechanism is bypassed without proper validation.
The mitigation strategy for CVE-2024-58094 involves implementing a comprehensive read-only mode check within the jfs_truncate_nolock function before any truncation operations are initiated. This modification ensures that when a filesystem is mounted in read-only mode, the truncate operation is properly rejected before any data modification attempts occur. The fix aligns with industry best practices for filesystem security by enforcing proper access controls and preventing unauthorized modifications to immutable filesystems. The solution addresses the core issue by ensuring that the xtTruncate function is called with the COMMIT_WMAP flag only when appropriate, preventing modifications in read-only mode as intended. System administrators should immediately apply the kernel patch that implements this read-only check, particularly on systems running JFS filesystems where read-only mounts are utilized for security or backup purposes. The vulnerability represents a significant risk to systems where JFS filesystems are used in environments requiring strict access controls, as it could enable attackers to bypass normal filesystem protections and potentially cause system instability or data integrity issues through carefully crafted file system operations.