Bug 2541346 (CVE-2026-98157)

Summary: CVE-2026-98157 kernel: EDAC/device_sysfs: Use kstrtouint() for poll_msec to prevent truncation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Error Detection and Correction (EDAC) subsystem. The sysfs interface for device polling improperly validated input values when configuring the polling interval, allowing integer truncation and zero-delay settings. A local user with write permissions to the attribute could exploit this flaw to cause the polling work to spin indefinitely without a delay, leading to excessive CPU utilization and a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-09-25 11:31:49 UTC 
In the Linux kernel, the following vulnerability has been resolved:

EDAC/device_sysfs: Use kstrtouint() for poll_msec to prevent truncation

The poll_msec sysfs store file uses simple_strtoul() which accepts an unsigned
long, but the target field (poll_msec) is unsigned int. On 64-bit systems,
a value > UINT_MAX is silently truncated when stored.

Fix the mismatch by using kstrtouint() instead. This rejects values larger
than UINT_MAX at parse time, making truncation impossible. Also add a check
for value < 1 to reject the 0-delay case, which would cause the poll work to
spin without delay and consume 100% CPU.
Comment 1 Keith Grant 2026-09-28 17:11:38 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98157.mbox