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CVE-2024-47660— fsnotify: clear PARENT_WATCHED flags lazily

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。攻击者利用该漏洞导致软锁定。

AI Predicted 5.5 Difficulty: Easy EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 873feea09ebc980cbd3631b767356ce1eee65ec1< 3f3ef1d9f66b93913ce2171120d9226b55acd41d affected
873feea09ebc980cbd3631b767356ce1eee65ec1< f9a48bc3dd9099935751458a5bbbea4b7c28abc8 affected
873feea09ebc980cbd3631b767356ce1eee65ec1< d8c42405fc3507cc43ba7e4986a773c3fc633f6e affected
873feea09ebc980cbd3631b767356ce1eee65ec1< fc1b1e135c3f72382f792e6c319fc088d5523ad5 affected
873feea09ebc980cbd3631b767356ce1eee65ec1< 7ef1d2e240c32b1f337a37232d037b07e3919e1a affected
873feea09ebc980cbd3631b767356ce1eee65ec1< 172e422ffea20a89bfdc672741c1aad6fbb5044e affected
2.6.38 affected
< 2.6.38 unaffected
… +6 more rows
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I. Basic Information for CVE-2024-47660

Vulnerability Information
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Vulnerability Title
fsnotify: clear PARENT_WATCHED flags lazily
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。攻击者利用该漏洞导致软锁定。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 873feea09ebc980cbd3631b767356ce1eee65ec1 ~ 3f3ef1d9f66b93913ce2171120d9226b55acd41d -
Linux Linux 2.6.38 -

II. Public POCs for CVE-2024-47660

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III. Intelligence Information for CVE-2024-47660

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Patches & Fixes for CVE-2024-47660 (5)

Same Patch Batch · Linux · 2024-10-09 · 17 CVEs total

CVE-2024-47659 9.1 CRITICAL smack: tcp: ipv4, fix incorrect labeling
CVE-2024-47668 7.8 HIGH lib/generic-radix-tree.c: Fix rare race in __genradix_ptr_alloc()
CVE-2024-47670 7.8 HIGH ocfs2: add bounds checking to ocfs2_xattr_find_entry()
CVE-2024-47658 7.5 HIGH crypto: stm32/cryp - call finalize with bh disabled
CVE-2024-47667 7.3 HIGH PCI: keystone: Add workaround for Errata #i2037 (AM65x SR 1.0)
CVE-2024-47669 7.3 HIGH nilfs2: fix state management in error path of log writing function
CVE-2024-46870 drm/amd/display: Disable DMCUB timeout for DCN35
CVE-2024-46871 drm/amd/display: Correct the defined value for AMDGPU_DMUB_NOTIFICATION_MAX
CVE-2024-47662 drm/amd/display: Remove register from DCN35 DMCUB diagnostic collection
CVE-2024-47661 drm/amd/display: Avoid overflow from uint32_t to uint8_t
CVE-2024-47663 staging: iio: frequency: ad9834: Validate frequency parameter value
CVE-2024-47664 spi: hisi-kunpeng: Add verification for the max_frequency provided by the firmware
CVE-2024-47665 i3c: mipi-i3c-hci: Error out instead on BUG_ON() in IBI DMA setup
CVE-2024-47666 scsi: pm80xx: Set phy->enable_completion only when we wait for it
CVE-2024-47671 USB: usbtmc: prevent kernel-usb-infoleak
CVE-2024-47673 wifi: iwlwifi: mvm: pause TCM when the firmware is stopped

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-47660

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