medium
4.9
CWE
476
Advisory Published
CVE Published
Updated

CVE-2015-7566: Null Pointer Dereference

First published: Thu Jan 07 2016(Updated: )

A local kernel crash on invalid USB device requiring the visor driver was reported. The clie_5_attach function of the visor driver, which is called during the driver initialization process, expects an OUT-Bulk-Endpoint. Due to an incomplete sanity check, the visor driver tries to dereference null-pointers, which results in crash. Vulnerable code: **** CentOS-Kernel linux-3.10.0-229.14.1.el7 (drivers/usb/serial/visor.c) ... 607 608 pipe = usb_sndbulkpipe(serial-&gt;dev, port-&gt;bulk_out_endpointAddress); 609 for (j = 0; j &lt; ARRAY_SIZE(port-&gt;write_urbs); ++j) 610 port-&gt;write_urbs[j]-&gt;pipe = pipe; /* if there is no configured OUT-bulk-endpoint, the kernel tries to dereference null-pointers */ 611 612 return 0; 613 } ... **** Reproducer can be found in original bug report: <a class="bz_bug_link bz_status_CLOSED bz_closed bz_public " title="CLOSED WONTFIX - CVE-2015-7566 Local RedHat Enterprise Linux DoS – RHEL 7.1 Kernel crashes on invalid USB device descriptors (visor driver) [local-DoS]" href="show_bug.cgi?id=1283371">https://bugzilla.redhat.com/show_bug.cgi?id=1283371</a> Proposed upstream patch: <a href="http://marc.info/?l=linux-usb&amp;m=145260786729359&amp;w=2">http://marc.info/?l=linux-usb&amp;m=145260786729359&amp;w=2</a> Upstream commit: <a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cb3232138e37129e88240a98a1d2aba2187ff57c">http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cb3232138e37129e88240a98a1d2aba2187ff57c</a> Bugtraq: <a href="http://seclists.org/bugtraq/2016/Mar/58">http://seclists.org/bugtraq/2016/Mar/58</a>

Credit: secalert@redhat.com secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
Novell Suse Linux Enterprise Software Development Kit=11-sp4
Novell Suse Linux Enterprise Debuginfo=11-sp4
Novell Suse Linux Enterprise Real Time Extension=11-sp4
Novell Suse Linux Enterprise Real Time Extension=12-sp1
Novell Suse Linux Enterprise Server=11-extra
Novell Suse Linux Enterprise Server=11-sp4
Linux Linux kernel<=4.4.1
debian/linux
5.10.223-1
6.1.106-3
6.1.99-1
6.10.9-1

Remedy

https://git.kernel.org/linus/cfb8da8f69b81d367b766888e83ec0483a31bf01

Remedy

https://git.kernel.org/linus/cb3232138e37129e88240a98a1d2aba2187ff57c

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Reference Links

Frequently Asked Questions

  • What is CVE-2015-7566?

    CVE-2015-7566 is a vulnerability in the Linux kernel that allows physically proximate attackers to cause a denial of service or possibly have other unspecified impacts.

  • What is the severity level of CVE-2015-7566?

    The severity level of CVE-2015-7566 is low.

  • How does CVE-2015-7566 affect the Linux kernel?

    CVE-2015-7566 affects the clie_5_attach function in drivers/usb/serial/visor.c in the Linux kernel through version 4.4.1.

  • How can an attacker exploit CVE-2015-7566?

    An attacker can exploit CVE-2015-7566 by inserting a USB device that lacks a bulk-out endpoint, causing a NULL pointer dereference and system crash.

  • What is the fix for CVE-2015-7566?

    The fix for CVE-2015-7566 is to update the Linux kernel to version 4.5 or higher.

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