CVE-2024-49965 in Linux
Summary
by MITRE • 10/21/2024
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: remove unreasonable unlock in ocfs2_read_blocks
Patch series "Misc fixes for ocfs2_read_blocks", v5.
This series contains 2 fixes for ocfs2_read_blocks(). The first patch fix the issue reported by syzbot, which detects bad unlock balance in ocfs2_read_blocks(). The second patch fixes an issue reported by Heming Zhao when reviewing above fix.
This patch (of 2):
There was a lock release before exiting, so remove the unreasonable unlock.
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Analysis
by VulDB Data Team • 03/21/2026
The vulnerability identified as CVE-2024-49965 affects the Linux kernel's ocfs2 filesystem implementation, specifically within the ocfs2_read_blocks function. This issue represents a lock management problem that can lead to improper synchronization behavior within the distributed filesystem. The ocfs2 filesystem is designed for shared storage environments where multiple nodes access the same storage resources simultaneously, making proper locking mechanisms critical for data integrity and system stability. The vulnerability stems from an unnecessary unlock operation that occurs before function exit, creating a potential race condition or inconsistent lock state that could compromise the filesystem's operational integrity.
The technical flaw manifests as an不合理的解锁操作在ocfs2_read_blocks函数退出前执行，这违反了标准的锁管理原则。根据CWE-1160分类，这种问题属于"Improper Locking"类别，具体表现为不适当的锁释放时机。该问题最初由syzbot检测到，其报告了在ocfs2_read_blocks函数中存在错误的锁平衡问题，这表明在函数执行过程中锁的获取和释放操作不匹配。通过分析发现，代码中存在一个在函数返回前的不必要解锁操作，这种操作会破坏原有的锁状态，可能导致后续操作访问被错误释放的锁资源。
从ATT&CK框架的角度分析，此漏洞可被归类为权限提升和系统稳定性破坏相关威胁。攻击者可能利用此漏洞导致系统出现锁竞争条件，进而引发数据不一致、文件系统损坏或系统崩溃等后果。该漏洞的利用可能间接影响系统的可用性，特别是在高并发访问场景下，多个进程同时访问ocfs2文件系统时可能导致系统不稳定。由于ocfs2主要用于企业级存储环境，此类漏洞可能影响关键业务系统的正常运行，特别是那些依赖共享存储的集群环境。
该漏洞的运营影响重大，特别是在部署了ocfs2文件系统的生产环境中。当锁管理机制出现故障时，可能导致文件系统处于不一致状态，进而引发数据丢失、访问失败或系统挂起等问题。系统管理员需要特别关注此类问题，因为它可能在系统负载较高时才显现，增加了问题诊断和修复的复杂性。建议立即应用相关补丁，同时监控系统中ocfs2相关组件的运行状态，特别是在高并发访问期间的锁竞争情况。对于关键业务系统，应制定应急响应计划，包括备份恢复策略和系统降级方案，以应对潜在的文件系统故障风险。