一、 漏洞 CVE-2025-39819 基础信息
漏洞信息
                                        # SMB 文件系统引用计数不一致漏洞

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漏洞标题
fs/smb: Fix inconsistent refcnt update
来源：美国国家漏洞数据库 NVD
漏洞描述信息
In the Linux kernel, the following vulnerability has been resolved: fs/smb: Fix inconsistent refcnt update A possible inconsistent update of refcount was identified in `smb2_compound_op`. Such inconsistent update could lead to possible resource leaks. Why it is a possible bug: 1. In the comment section of the function, it clearly states that the reference to `cfile` should be dropped after calling this function. 2. Every control flow path would check and drop the reference to `cfile`, except the patched one. 3. Existing callers would not handle refcount update of `cfile` if -ENOMEM is returned. To fix the bug, an extra goto label "out" is added, to make sure that the cleanup logic would always be respected. As the problem is caused by the allocation failure of `vars`, the cleanup logic between label "finished" and "out" can be safely ignored. According to the definition of function `is_replayable_error`, the error code of "-ENOMEM" is not recoverable. Therefore, the replay logic also gets ignored.
来源：美国国家漏洞数据库 NVD
CVSS信息
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来源：美国国家漏洞数据库 NVD
漏洞类别
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来源：美国国家漏洞数据库 NVD
漏洞标题
Linux kernel 安全漏洞
来源：中国国家信息安全漏洞库 CNNVD
漏洞描述信息
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于smb2_compound_op函数中存在不一致的引用计数更新，可能导致资源泄漏。
来源：中国国家信息安全漏洞库 CNNVD
CVSS信息
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来源：中国国家信息安全漏洞库 CNNVD
漏洞类别
其他
来源：中国国家信息安全漏洞库 CNNVD
二、漏洞 CVE-2025-39819 的公开POC
# POC 描述 源链接 神龙链接
三、漏洞 CVE-2025-39819 的情报信息
四、漏洞 CVE-2025-39819 的评论

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