CVE - CVE-2024-47660

CVE-ID
CVE-2024-47660	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: fsnotify: clear PARENT_WATCHED flags lazily In some setups directories can have many (usually negative) dentries. Hence __fsnotify_update_child_dentry_flags() function can take a significant amount of time. Since the bulk of this function happens under inode->i_lock this causes a significant contention on the lock when we remove the watch from the directory as the __fsnotify_update_child_dentry_flags() call from fsnotify_recalc_mask() races with __fsnotify_update_child_dentry_flags() calls from __fsnotify_parent() happening on children. This can lead upto softlockup reports reported by users. Fix the problem by calling fsnotify_update_children_dentry_flags() to set PARENT_WATCHED flags only when parent starts watching children. When parent stops watching children, clear false positive PARENT_WATCHED flags lazily in __fsnotify_parent() for each accessed child.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044e URL:https://git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044e MISC:https://git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41d URL:https://git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41d MISC:https://git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1a URL:https://git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1a MISC:https://git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6e URL:https://git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6e MISC:https://git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8 URL:https://git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8 MISC:https://git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5 URL:https://git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5
Assigning CNA
kernel.org
Date Record Created
20240930	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240930)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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