Bug 2313104 (CVE-2024-46756)

Summary: CVE-2024-46756 kernel: hwmon: (w83627ehf) Fix underflows seen when writing limit attributes
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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[REJECTED CVE] A vulnerability in the Linux kernel's hwmon subsystem (w83627ehf driver) has been identified, where writing large negative values (e.g., -9223372036854775808) to limit attributes caused an underflow due to improper ordering of operations in DIV_ROUND_CLOSEST(). An attacker with write access to these attributes could potentially trigger unexpected behavior or system instability.
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Bug Depends On: 2313202    
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Description OSIDB Bzimport 2024-09-18 08:21:50 UTC 
In the Linux kernel, the following vulnerability has been resolved:

hwmon: (w83627ehf) Fix underflows seen when writing limit attributes

DIV_ROUND_CLOSEST() after kstrtol() results in an underflow if a large
negative number such as -9223372036854775808 is provided by the user.
Fix it by reordering clamp_val() and DIV_ROUND_CLOSEST() operations.
Comment 1 Michal Findra 2024-09-18 10:09:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024091840-CVE-2024-46756-2ca6@gregkh/T
Comment 2 TEJ RATHI 2025-02-20 12:12:28 UTC 
This CVE has been rejected upstream:
https://lore.kernel.org/linux-cve-announce/2025010926-REJECTED-337e@gregkh/
Comment 3 errata-xmlrpc 2025-05-13 08:28:27 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2025:6966 https://access.redhat.com/errata/RHSA-2025:6966