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CVE-2024-36963— tracefs: Reset permissions on remount if permissions are options

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 tracefs 中存在安全问题。

CVSS 7.8 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1222.001 · Windows Permissions

Affected Version Matrix 11

VendorProduct Version RangeStatus
Linux Linux 628adb842bd5e1c2c598534a7a022b8235289de6< 5f91fc82794d4a6e41cdcd02d00baa377d94ca78 affected
8186fff7ab649085e2c60d032d9a20a85af1d87c< 414fb08628143203d29ccd0264b5a83fb9523c03 affected
8186fff7ab649085e2c60d032d9a20a85af1d87c< baa23a8d4360d981a49913841a726edede5cdd54 affected
9c2ac5e0ea7899411fd900d4681890722a020735 affected
6.6.18< 6.6.31 affected
6.7.4< 6.8 affected
6.8 affected
< 6.8 unaffected
… +3 more rows
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I. Basic Information for CVE-2024-36963

Vulnerability Information
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Vulnerability Title
tracefs: Reset permissions on remount if permissions are options
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tracefs: Reset permissions on remount if permissions are options There's an inconsistency with the way permissions are handled in tracefs. Because the permissions are generated when accessed, they default to the root inode's permission if they were never set by the user. If the user sets the permissions, then a flag is set and the permissions are saved via the inode (for tracefs files) or an internal attribute field (for eventfs). But if a remount happens that specify the permissions, all the files that were not changed by the user gets updated, but the ones that were are not. If the user were to remount the file system with a given permission, then all files and directories within that file system should be updated. This can cause security issues if a file's permission was updated but the admin forgot about it. They could incorrectly think that remounting with permissions set would update all files, but miss some. For example: # cd /sys/kernel/tracing # chgrp 1002 current_tracer # ls -l [..] -rw-r----- 1 root root 0 May 1 21:25 buffer_size_kb -rw-r----- 1 root root 0 May 1 21:25 buffer_subbuf_size_kb -r--r----- 1 root root 0 May 1 21:25 buffer_total_size_kb -rw-r----- 1 root lkp 0 May 1 21:25 current_tracer -rw-r----- 1 root root 0 May 1 21:25 dynamic_events -r--r----- 1 root root 0 May 1 21:25 dyn_ftrace_total_info -r--r----- 1 root root 0 May 1 21:25 enabled_functions Where current_tracer now has group "lkp". # mount -o remount,gid=1001 . # ls -l -rw-r----- 1 root tracing 0 May 1 21:25 buffer_size_kb -rw-r----- 1 root tracing 0 May 1 21:25 buffer_subbuf_size_kb -r--r----- 1 root tracing 0 May 1 21:25 buffer_total_size_kb -rw-r----- 1 root lkp 0 May 1 21:25 current_tracer -rw-r----- 1 root tracing 0 May 1 21:25 dynamic_events -r--r----- 1 root tracing 0 May 1 21:25 dyn_ftrace_total_info -r--r----- 1 root tracing 0 May 1 21:25 enabled_functions Everything changed but the "current_tracer". Add a new link list that keeps track of all the tracefs_inodes which has the permission flags that tell if the file/dir should use the root inode's permission or not. Then on remount, clear all the flags so that the default behavior of using the root inode's permission is done for all files and directories.
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 tracefs 中存在安全问题。
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 628adb842bd5e1c2c598534a7a022b8235289de6 ~ 5f91fc82794d4a6e41cdcd02d00baa377d94ca78 -
Linux Linux 6.8 -

II. Public POCs for CVE-2024-36963

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III. Intelligence Information for CVE-2024-36963

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Other References for CVE-2024-36963 (3)

Same Patch Batch · Linux · 2024-06-03 · 5 CVEs total

CVE-2024-36964 8.8 HIGH fs/9p: only translate RWX permissions for plain 9P2000
CVE-2024-36961 7.8 HIGH thermal/debugfs: Fix two locking issues with thermal zone debug
CVE-2024-36962 7.5 HIGH net: ks8851: Queue RX packets in IRQ handler instead of disabling BHs
CVE-2024-36960 7.1 HIGH drm/vmwgfx: Fix invalid reads in fence signaled events

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2024-36963

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