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Date: Thu, 31 Dec 2015 02:09:43 +0900
From: Jihyeok Seo <>
Subject: CVE Request: Squashfs 4.2 Race Condition

A malformed Squashfs filesystem can cause a race condition in unsquashfs. Versions below 4.3 are affected.

This is caused by the decompress thread attempting to access a shared queue, resulting in a SIGSEGV.

    struct cache_entry *entry = queue_get(to_deflate);

I have attached a sample filesystem image illustrating this case.

Download attachment "attachment" of type "application/octet-stream" (3042 bytes)

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