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CVE-2024-53143— fsnotify: Fix ordering of iput() and watched_objects decrement

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，该漏洞源于fsnotify组件中iput和watched_objects计数减少顺序错误，可能导致释放后重用。

CVSS 7.8 · High EPSS 0.21% · P11

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux d2f277e26f521ccf6fb438463b41dba6123caabe< 45a8f8232a495221ed058191629f5c628f21601a affected
d2f277e26f521ccf6fb438463b41dba6123caabe< 83af1cfa10d9aafdabd06b3655e07727f373b434 affected
d2f277e26f521ccf6fb438463b41dba6123caabe< 21d1b618b6b9da46c5116c640ac4b1cc8d40d63a affected
6.10 affected
< 6.10 unaffected
6.11.11≤ 6.11.* unaffected
6.12.2≤ 6.12.* unaffected
6.13≤ * unaffected
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I. Basic Information for CVE-2024-53143

Vulnerability Information
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Vulnerability Title
fsnotify: Fix ordering of iput() and watched_objects decrement
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: fsnotify: Fix ordering of iput() and watched_objects decrement Ensure the superblock is kept alive until we're done with iput(). Holding a reference to an inode is not allowed unless we ensure the superblock stays alive, which fsnotify does by keeping the watched_objects count elevated, so iput() must happen before the watched_objects decrement. This can lead to a UAF of something like sb->s_fs_info in tmpfs, but the UAF is hard to hit because race orderings that oops are more likely, thanks to the CHECK_DATA_CORRUPTION() block in generic_shutdown_super(). Also, ensure that fsnotify_put_sb_watched_objects() doesn't call fsnotify_sb_watched_objects() on a superblock that may have already been freed, which would cause a UAF read of sb->s_fsnotify_info.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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，该漏洞源于fsnotify组件中iput和watched_objects计数减少顺序错误，可能导致释放后重用。
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 d2f277e26f521ccf6fb438463b41dba6123caabe ~ 45a8f8232a495221ed058191629f5c628f21601a -
Linux Linux 6.10 -

II. Public POCs for CVE-2024-53143

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III. Intelligence Information for CVE-2024-53143

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Patches & Fixes for CVE-2024-53143 (3)

Vendor Advisories for CVE-2024-53143 (1)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-53143

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