CVE-2024-47660
"Linux filesystem Denial of Service (DoS) Vulnerability"
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.
INFO
Published Date :
Oct. 9, 2024, 2:15 p.m.
Last Modified :
Oct. 23, 2024, 5 p.m.
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Remotely Exploitable :
No
Impact Score :
3.6
Exploitability Score :
1.0
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-47660.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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The following list is the news that have been mention
CVE-2024-47660 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-47660 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
Oct. 23, 2024
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H Changed Reference Type https://git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044e No Types Assigned https://git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044e Patch Changed Reference Type https://git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41d No Types Assigned https://git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41d Patch Changed Reference Type https://git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1a No Types Assigned https://git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1a Patch Changed Reference Type https://git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6e No Types Assigned https://git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6e Patch Changed Reference Type https://git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8 No Types Assigned https://git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8 Patch Changed Reference Type https://git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5 No Types Assigned https://git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5 Patch Added CWE NIST CWE-362 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.10.226 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.167 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.109 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.50 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.10.9 -
CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 09, 2024
Action Type Old Value New Value Added 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. Added Reference kernel.org https://git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41d [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6e [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5 [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1a [No types assigned] Added Reference kernel.org https://git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044e [No types assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-47660 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-47660
weaknesses.