CVE-2017-1082

Severity: high (CVSS 7.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2018-09-12 · updated 2026-06-17
Weakness: CWE-20

Description

In FreeBSD 11.x before 11.1-RELEASE and 10.x before 10.4-RELEASE, the qsort algorithm has a deterministic recursion pattern. Feeding a pathological input to the algorithm can lead to excessive stack usage and potential overflow. Applications that use qsort to handle large data set may crash if the input follows the pathological pattern.

Affected products

FreeBSD: from 10.0 through 10.4; from 11.0 before 11.1 — fixed in 11.1

How to fix

Upgrade to a fixed version: FreeBSD 11.1. Check the vendor advisory for mitigations.

References

https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt
https://www.qualys.com/2017/06/19/stack-clash/stack-clash.txt

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