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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2024-42102 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: Revert "mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again" Patch series "mm: Avoid possible overflows in dirty throttling". Dirty throttling logic assumes dirty limits in page units fit into 32-bits. This patch series makes sure this is true (see patch 2/2 for more details). This patch (of 2): This reverts commit 9319b647902cbd5cc884ac08a8a6d54ce111fc78. The commit is broken in several ways. Firstly, the removed (u64) cast from the multiplication will introduce a multiplication overflow on 32-bit archs if wb_thresh * bg_thresh >= 1<<32 (which is actually common - the default settings with 4GB of RAM will trigger this). Secondly, the div64_u64() is unnecessarily expensive on 32-bit archs. We have div64_ul() in case we want to be safe & cheap. Thirdly, if dirty thresholds are larger than 1<<32 pages, then dirty balancing is going to blow up in many other spectacular ways anyway so trying to fix one possible overflow is just moot.


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/000099d71648504fb9c7a4616f92c2b70c3e44ec Patch 
https://git.kernel.org/stable/c/145faa3d03688cbb7bbaaecbd84c01539852942c Patch 
https://git.kernel.org/stable/c/23a28f5f3f6ca1e4184bd0e9631cd0944cf1c807 Patch 
https://git.kernel.org/stable/c/253f9ea7e8e53a5176bd80ceb174907b10724c1a Patch 
https://git.kernel.org/stable/c/2820005edae13b140f2d54267d1bd6bb23915f59 Patch 
https://git.kernel.org/stable/c/30139c702048f1097342a31302cbd3d478f50c63 Patch 
https://git.kernel.org/stable/c/cbbe17a324437c0ff99881a3ee453da45b228a00 Patch 
https://git.kernel.org/stable/c/f6620df12cb6bdcad671d269debbb23573502f9d Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-369 Divide By Zero cwe source acceptance level NIST  

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2024-42102
NVD Published Date:
07/30/2024
NVD Last Modified:
08/21/2024
Source:
kernel.org