The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2014:1392 advisory.

    The kernel packages contain the Linux kernel, the core of any Linux     operating system.

    * A NULL pointer dereference flaw was found in the way the Linux kernel's     Stream Control Transmission Protocol (SCTP) implementation handled     simultaneous connections between the same hosts. A remote attacker could     use this flaw to crash the system. (CVE-2014-5077, Important)

    * An integer overflow flaw was found in the way the Linux kernel's Frame     Buffer device implementation mapped kernel memory to user space via the     mmap syscall. A local user able to access a frame buffer device file     (/dev/fb*) could possibly use this flaw to escalate their privileges on the     system. (CVE-2013-2596, Important)

    * A flaw was found in the way the ipc_rcu_putref() function in the Linux     kernel's IPC implementation handled reference counter decrementing.
    A local, unprivileged user could use this flaw to trigger an Out of Memory     (OOM) condition and, potentially, crash the system. (CVE-2013-4483,     Moderate)

    * It was found that the permission checks performed by the Linux kernel     when a netlink message was received were not sufficient. A local,     unprivileged user could potentially bypass these restrictions by passing a     netlink socket as stdout or stderr to a more privileged process and     altering the output of this process. (CVE-2014-0181, Moderate)

    * It was found that the try_to_unmap_cluster() function in the Linux     kernel's Memory Managment subsystem did not properly handle page locking in     certain cases, which could potentially trigger the BUG_ON() macro in the     mlock_vma_page() function. A local, unprivileged user could use this flaw     to crash the system. (CVE-2014-3122, Moderate)

    * A flaw was found in the way the Linux kernel's kvm_iommu_map_pages()     function handled IOMMU mapping failures. A privileged user in a guest with     an assigned host device could use this flaw to crash the host.
    (CVE-2014-3601, Moderate)

    * Multiple use-after-free flaws were found in the way the Linux kernel's     Advanced Linux Sound Architecture (ALSA) implementation handled user     controls. A local, privileged user could use either of these flaws to crash     the system. (CVE-2014-4653, CVE-2014-4654, CVE-2014-4655, Moderate)

    * A flaw was found in the way the Linux kernel's VFS subsystem handled     reference counting when performing unmount operations on symbolic links.
    A local, unprivileged user could use this flaw to exhaust all available     memory on the system or, potentially, trigger a use-after-free error,     resulting in a system crash or privilege escalation. (CVE-2014-5045,     Moderate)

    * An integer overflow flaw was found in the way the lzo1x_decompress_safe()     function of the Linux kernel's LZO implementation processed Literal Runs.
    A local attacker could, in extremely rare cases, use this flaw to crash the     system or, potentially, escalate their privileges on the system.
    (CVE-2014-4608, Low)

    Red Hat would like to thank Vladimir Davydov of Parallels for reporting     CVE-2013-4483, Jack Morgenstein of Mellanox for reporting CVE-2014-3601,     Vasily Averin of Parallels for reporting CVE-2014-5045, and Don A.
    Bailey from Lab Mouse Security for reporting CVE-2014-4608. The security     impact of the CVE-2014-3601 issue was discovered by Michael Tsirkin of     Red Hat.

    This update also fixes several hundred bugs and adds numerous enhancements.
    Refer to the Red Hat Enterprise Linux 6.6 Release Notes for information on     the most significant of these changes, and the Technical Notes for further     information, both linked to in the References.

    All Red Hat Enterprise Linux 6 users are advised to install these updated     packages, which correct these issues, and fix the bugs and add the     enhancements noted in the Red Hat Enterprise Linux 6.6 Release Notes and     Technical Notes. The system must be rebooted for this update to     take effect.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The linux-2.6 update issued as DLA-246-1 caused regressions. This update corrects the defective patches applied in that update causing these problems. For reference the original advisory text follows.

This update fixes the CVEs described below.

CVE-2011-5321

Jiri Slaby discovered that tty_driver_lookup_tty() may leak a reference to the tty driver. A local user could use this flaw to crash the system.

CVE-2012-6689

Pablo Neira Ayuso discovered that non-root user-space processes can send forged Netlink notifications to other processes. A local user could use this flaw for denial of service or privilege escalation.

CVE-2014-3184

Ben Hawkes discovered that various HID drivers may over-read the report descriptor buffer, possibly resulting in a crash if a HID with a crafted descriptor is plugged in.

CVE-2014-8159

It was found that the Linux kernel's InfiniBand/RDMA subsystem did not properly sanitize input parameters while registering memory regions from user space via the (u)verbs API. A local user with access to a /dev/infiniband/uverbsX device could use this flaw to crash the system or, potentially, escalate their privileges on the system.

CVE-2014-9683

Dmitry Chernenkov discovered that eCryptfs writes past the end of the allocated buffer during encrypted filename decoding, resulting in local denial of service.

CVE-2014-9728 / CVE-2014-9729 / CVE-2014-9730 / CVE-2014-9731 / CVE-2015-4167

Carl Henrik Lunde discovered that the UDF implementation is missing several necessary length checks. A local user that can mount devices could use these various flaws to crash the system, to leak information from the kernel, or possibly for privilege escalation.

CVE-2015-1805

Red Hat discovered that the pipe iovec read and write implementations may iterate over the iovec twice but will modify the iovec such that the second iteration accesses the wrong memory. A local user could use this flaw to crash the system or possibly for privilege escalation.
This may also result in data corruption and information leaks in pipes between non-malicious processes.

CVE-2015-2041

Sasha Levin discovered that the LLC subsystem exposed some variables as sysctls with the wrong type. On a 64-bit kernel, this possibly allows privilege escalation from a process with CAP_NET_ADMIN capability; it also results in a trivial information leak.

CVE-2015-2042

Sasha Levin discovered that the RDS subsystem exposed some variables as sysctls with the wrong type. On a 64-bit kernel, this results in a trivial information leak.

CVE-2015-2830

Andrew Lutomirski discovered that when a 64-bit task on an amd64 kernel makes a fork(2) or clone(2) system call using int $0x80, the 32-bit compatibility flag is set (correctly) but is not cleared on return. As a result, both seccomp and audit will misinterpret the following system call by the task(s), possibly leading to a violation of security policy.

CVE-2015-2922

Modio AB discovered that the IPv6 subsystem would process a router advertisement that specifies no route but only a hop limit, which would then be applied to the interface that received it. This can result in loss of IPv6 connectivity beyond the local network.

This may be mitigated by disabling processing of IPv6 router advertisements if they are not needed: sysctl net.ipv6.conf.default.accept_ra=0 sysctl net.ipv6.conf.<interface>.accept_ra=0

CVE-2015-3339

It was found that the execve(2) system call can race with inode attribute changes made by chown(2). Although chown(2) clears the setuid/setgid bits of a file if it changes the respective owner ID, this race condition could result in execve(2) setting effective uid/gid to the new owner ID, a privilege escalation.

For the oldoldstable distribution (squeeze), these problems have been fixed in version 2.6.32-48squeeze12.

For the oldstable distribution (wheezy), these problems were fixed in linux version 3.2.68-1+deb7u1 or earlier, except for CVE-2015-1805 and CVE-2015-4167 which will be fixed soon.

For the stable distribution (jessie), these problems were fixed in linux version 3.16.7-ckt11-1 or earlier, except for CVE-2015-4167 which will be fixed later.

We recommend that you upgrade your linux-2.6 packages.

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Published	Updated	Severity
78409	RHEL 6 : kernel (RHSA-2014:1392)	Nessus	Red Hat Local Security Checks	10/14/2014	8/15/2025	high
84252	Debian DLA-246-2 : linux-2.6 regression update	Nessus	Debian Local Security Checks	6/18/2015	1/11/2021	high

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