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Linux 4.6 auditsc.c Double-Fetch

Linux 4.6 auditsc.c Double-Fetch
Posted Jul 4, 2016
Authored by Pengfei Wang

A double-fetch vulnerability exists in Linux-4.6/kernel/auditsc.c for kernel versions 4.6 and below that can allow for a race condition.

tags | advisory, kernel
systems | linux
advisories | CVE-2016-6136
SHA-256 | b8484509b883b5ba7efb0f9836de1eba2e683bda2f71f327c5292b39ac3bafa3

Linux 4.6 auditsc.c Double-Fetch

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I found this double-fetch vulnerability when I was doing my research on double-fetch issue analysis, and I’d like to make an announcement here. 

This was found in Linux kernel file Linux-4.6/kernel/auditsc.c, and crafted user space data change under race condition will make control strings processed as none-control strings, which could mislead the audit subsystem of Linux kernel.
======================================================
1. Affected Versions: Linux Kernel 4.6 and earlier versions.

2. Detailed description in my report to Kernel Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=120681

3. Patch: This has been confirmed by the maintainers and patched in the new version: https://github.com/linux-audit/audit-kernel/issues/18

4. CVE: The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2016-6136 to this issue.

Kind regards
Pengfei Wang
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