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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2022-48988 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: memcg: fix possible use-after-free in memcg_write_event_control() memcg_write_event_control() accesses the dentry->d_name of the specified control fd to route the write call. As a cgroup interface file can't be renamed, it's safe to access d_name as long as the specified file is a regular cgroup file. Also, as these cgroup interface files can't be removed before the directory, it's safe to access the parent too. Prior to 347c4a874710 ("memcg: remove cgroup_event->cft"), there was a call to __file_cft() which verified that the specified file is a regular cgroupfs file before further accesses. The cftype pointer returned from __file_cft() was no longer necessary and the commit inadvertently dropped the file type check with it allowing any file to slip through. With the invarients broken, the d_name and parent accesses can now race against renames and removals of arbitrary files and cause use-after-free's. Fix the bug by resurrecting the file type check in __file_cft(). Now that cgroupfs is implemented through kernfs, checking the file operations needs to go through a layer of indirection. Instead, let's check the superblock and dentry type.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://git.kernel.org/stable/c/0ed074317b835caa6c03bcfa8f133365324673dc Patch 
https://git.kernel.org/stable/c/35963b31821920908e397146502066f6b032c917 Patch 
https://git.kernel.org/stable/c/4a7ba45b1a435e7097ca0f79a847d0949d0eb088 Patch 
https://git.kernel.org/stable/c/aad8bbd17a1d586005feb9226c2e9cfce1432e13 Patch 
https://git.kernel.org/stable/c/b77600e26fd48727a95ffd50ba1e937efb548125 Patch 
https://git.kernel.org/stable/c/e1ae97624ecf400ea56c238bff23e5cd139df0b8 Patch 
https://git.kernel.org/stable/c/f1f7f36cf682fa59db15e2089039a2eeb58ff2ad Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-416 Use After Free cwe source acceptance level NIST  

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2022-48988
NVD Published Date:
10/21/2024
NVD Last Modified:
11/01/2024
Source:
kernel.org