CVE fixes in KVM, ext4, and SCTP.

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

USN-2448-1 fixed vulnerabilities in the Linux kernel. Due to an unrelated regression TCP Throughput drops to zero for several drivers after upgrading. This update fixes the problem.

We apologize for the inconvenience.

An information leak in the Linux kernel was discovered that could leak the high 16 bits of the kernel stack address on 32-bit Kernel Virtual Machine (KVM) paravirt guests. A user in the guest OS could exploit this leak to obtain information that could potentially be used to aid in attacking the kernel. (CVE-2014-8134)

Rabin Vincent, Robert Swiecki, Russell King discovered that the ftrace subsystem of the Linux kernel does not properly handle private syscall numbers. A local user could exploit this flaw to cause a denial of service (OOPS).
(CVE-2014-7826)

A flaw in the handling of malformed ASCONF chunks by SCTP (Stream Control Transmission Protocol) implementation in the Linux kernel was discovered. A remote attacker could exploit this flaw to cause a denial of service (system crash).
(CVE-2014-3673)

A flaw in the handling of duplicate ASCONF chunks by SCTP (Stream Control Transmission Protocol) implementation in the Linux kernel was discovered. A remote attacker could exploit this flaw to cause a denial of service (panic).
(CVE-2014-3687)

It was discovered that excessive queuing by SCTP (Stream Control Transmission Protocol) implementation in the Linux kernel can cause memory pressure. A remote attacker could exploit this flaw to cause a denial of service.
(CVE-2014-3688)

Rabin Vincent, Robert Swiecki, Russell Kinglaw discovered a flaw in how the perf subsystem of the Linux kernel handles private systecall numbers. A local user could exploit this to cause a denial of service (OOPS) or bypass ASLR protections via a crafted application. (CVE-2014-7825)

Andy Lutomirski discovered a flaw in how the Linux kernel handles pivot_root when used with a chroot directory. A local user could exploit this flaw to cause a denial of service (mount-tree loop). (CVE-2014-7970)

Dmitry Monakhov discovered a race condition in the ext4_file_write_iter function of the Linux kernel's ext4 filesystem. A local user could exploit this flaw to cause a denial of service (file unavailability). (CVE-2014-8086)

The KVM (kernel virtual machine) subsystem of the Linux kernel miscalculates the number of memory pages during the handling of a mapping failure. A guest OS user could exploit this to cause a denial of service (host OS page unpinning) or possibly have unspecified other impact by leveraging guest OS privileges. (CVE-2014-8369)

Andy Lutomirski discovered that the Linux kernel does not properly handle faults associated with the Stack Segment (SS) register on the x86 architecture. A local attacker could exploit this flaw to cause a denial of service (panic). (CVE-2014-9090).

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

Even more btrfs corruption/error fixes. Small b43 wireless regression fix.

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

The remote Redhat Enterprise Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2015:0290 advisory.

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

    * A flaw was found in the way the Linux kernel's XFS file system handled     replacing of remote attributes under certain conditions. A local user with     access to XFS file system mount could potentially use this flaw to escalate     their privileges on the system. (CVE-2015-0274, Important)

    * It was found that the Linux kernel's KVM implementation did not ensure     that the host CR4 control register value remained unchanged across VM     entries on the same virtual CPU. A local, unprivileged user could use this     flaw to cause denial of service on the system. (CVE-2014-3690, Moderate)

    * A flaw was found in the way Linux kernel's Transparent Huge Pages (THP)     implementation handled non-huge page migration. A local, unprivileged user     could use this flaw to crash the kernel by migrating transparent hugepages.
    (CVE-2014-3940, Moderate)

    * An out-of-bounds memory access flaw was found in the syscall tracing     functionality of the Linux kernel's perf subsystem. A local, unprivileged     user could use this flaw to crash the system. (CVE-2014-7825, Moderate)

    * An out-of-bounds memory access flaw was found in the syscall tracing     functionality of the Linux kernel's ftrace subsystem. On a system with     ftrace syscall tracing enabled, a local, unprivileged user could use this     flaw to crash the system, or escalate their privileges. (CVE-2014-7826,     Moderate)

    * A race condition flaw was found in the Linux kernel's ext4 file system     implementation that allowed a local, unprivileged user to crash the system     by simultaneously writing to a file and toggling the O_DIRECT flag using     fcntl(F_SETFL) on that file. (CVE-2014-8086, Moderate)

    * A flaw was found in the way the Linux kernel's netfilter subsystem     handled generic protocol tracking. As demonstrated in the Stream Control     Transmission Protocol (SCTP) case, a remote attacker could use this flaw to     bypass intended iptables rule restrictions when the associated connection     tracking module was not loaded on the system. (CVE-2014-8160, Moderate)

    * It was found that due to excessive files_lock locking, a soft lockup     could be triggered in the Linux kernel when performing asynchronous I/O     operations. A local, unprivileged user could use this flaw to crash the     system. (CVE-2014-8172, Moderate)

    * A NULL pointer dereference flaw was found in the way the Linux kernel's     madvise MADV_WILLNEED functionality handled page table locking. A local,     unprivileged user could use this flaw to crash the system. (CVE-2014-8173,     Moderate)

    * An information leak flaw was found in the Linux kernel's IEEE 802.11     wireless networking implementation. When software encryption was used, a     remote attacker could use this flaw to leak up to 8 bytes of plaintext.
    (CVE-2014-8709, Low)

    * A stack-based buffer overflow flaw was found in the TechnoTrend/Hauppauge     DEC USB device driver. A local user with write access to the corresponding     device could use this flaw to crash the kernel or, potentially, elevate     their privileges on the system. (CVE-2014-8884, Low)

    Red Hat would like to thank Eric Windisch of the Docker project for     reporting CVE-2015-0274, Andy Lutomirski for reporting CVE-2014-3690, and     Robert wicki for reporting CVE-2014-7825 and CVE-2014-7826.

    This update also fixes several hundred bugs and adds numerous enhancements.
    Refer to the Red Hat Enterprise Linux 7.1 Release Notes for information on     the most significant of these changes, and the following Knowledgebase     article for further information: https://access.redhat.com/articles/1352803

    All Red Hat Enterprise Linux 7 users are advised to install these updated     packages, which correct these issues and add these enhancements. 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 remote Oracle Linux 7 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2015-0290 advisory.

    - [fs] ext4: fix overwrite race condition (Jacob Tanenbaum) [1152607] {CVE-2014-8086}
    - [media] ttusb-dec: buffer overflow in ioctl (Alexander Gordeev) [1167116] {CVE-2014-8884}
    - [virt] kvm/vmx: invalid host cr4 handling across vm entries (Jacob Tanenbaum) [1153329] {CVE-2014-3690}
    - [fs] proc/task_mmu: fix missing check during hugepage migration (Jacob Tanenbaum) [1105040]     {CVE-2014-3940}
    - [kernel] trace: insufficient syscall number validation in perf and ftrace subsystems (Jacob Tanenbaum)     [1161570] {CVE-2014-7825 CVE-2014-7826}
    - [x86] traps: stop using IST for #SS (Petr  Matousek) [1172813] {CVE-2014-9322}
    - [net] sctp: fix NULL pointer dereference in af->from_addr_param on malformed packet (Daniel Borkmann)     [1154002] {CVE-2014-7841}
    - [mm] shmem: fix splicing from a hole while its punched (Denys Vlasenko) [1118245] {CVE-2014-4171}
    - [mm] shmem: fix faulting into a hole, not taking i_mutex (Denys Vlasenko) [1118245] {CVE-2014-4171}
    - [mm] shmem: fix faulting into a hole while its punched (Denys Vlasenko) [1118245] {CVE-2014-4171}
    - [fs] isofs: unbound recursion when processing relocated directories (Jacob Tanenbaum) [1142271]     {CVE-2014-5471 CVE-2014-5472}

Tenable has extracted the preceding description block directly from the Oracle 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.

* A flaw was found in the way the Linux kernel's XFS file system handled replacing of remote attributes under certain conditions. A local user with access to XFS file system mount could potentially use this flaw to escalate their privileges on the system. (CVE-2015-0274, Important)

* It was found that the Linux kernel's KVM implementation did not ensure that the host CR4 control register value remained unchanged across VM entries on the same virtual CPU. A local, unprivileged user could use this flaw to cause denial of service on the system.
(CVE-2014-3690, Moderate)

* A flaw was found in the way Linux kernel's Transparent Huge Pages (THP) implementation handled non-huge page migration. A local, unprivileged user could use this flaw to crash the kernel by migrating transparent hugepages. (CVE-2014-3940, Moderate)

* An out-of-bounds memory access flaw was found in the syscall tracing functionality of the Linux kernel's perf subsystem. A local, unprivileged user could use this flaw to crash the system.
(CVE-2014-7825, Moderate)

* An out-of-bounds memory access flaw was found in the syscall tracing functionality of the Linux kernel's ftrace subsystem. On a system with ftrace syscall tracing enabled, a local, unprivileged user could use this flaw to crash the system, or escalate their privileges.
(CVE-2014-7826, Moderate)

* A race condition flaw was found in the Linux kernel's ext4 file system implementation that allowed a local, unprivileged user to crash the system by simultaneously writing to a file and toggling the O_DIRECT flag using fcntl(F_SETFL) on that file. (CVE-2014-8086, Moderate)

* A flaw was found in the way the Linux kernel's netfilter subsystem handled generic protocol tracking. As demonstrated in the Stream Control Transmission Protocol (SCTP) case, a remote attacker could use this flaw to bypass intended iptables rule restrictions when the associated connection tracking module was not loaded on the system.
(CVE-2014-8160, Moderate)

* It was found that due to excessive files_lock locking, a soft lockup could be triggered in the Linux kernel when performing asynchronous I/O operations. A local, unprivileged user could use this flaw to crash the system. (CVE-2014-8172, Moderate)

* A NULL pointer dereference flaw was found in the way the Linux kernel's madvise MADV_WILLNEED functionality handled page table locking. A local, unprivileged user could use this flaw to crash the system. (CVE-2014-8173, Moderate)

* An information leak flaw was found in the Linux kernel's IEEE 802.11 wireless networking implementation. When software encryption was used, a remote attacker could use this flaw to leak up to 8 bytes of plaintext. (CVE-2014-8709, Low)

* A stack-based buffer overflow flaw was found in the TechnoTrend/Hauppauge DEC USB device driver. A local user with write access to the corresponding device could use this flaw to crash the kernel or, potentially, elevate their privileges on the system.
(CVE-2014-8884, Low)

* Users of kernel modules may need to upgrade the module to maintain compatibility.

The system must be rebooted for this update to take effect.

The SUSE Linux Enterprise 12 kernel was updated to version 3.12.43 to receive various security and bugfixes.

Following security bugs were fixed :

  - CVE-2014-3647: arch/x86/kvm/emulate.c in the KVM     subsystem in the Linux kernel through 3.17.2 did not     properly perform RIP changes, which allowed guest OS     users to cause a denial of service (guest OS crash) via     a crafted application (bsc#899192).

  - CVE-2014-8086: Race condition in the     ext4_file_write_iter function in fs/ext4/file.c in the     Linux kernel through 3.17 allowed local users to cause a     denial of service (file unavailability) via a     combination of a write action and an F_SETFL fcntl     operation for the O_DIRECT flag (bsc#900881).

  - CVE-2014-8159: The InfiniBand (IB) implementation did     not properly restrict use of User Verbs for registration     of memory regions, which allowed local users to access     arbitrary physical memory locations, and consequently     cause a denial of service (system crash) or gain     privileges, by leveraging permissions on a uverbs device     under /dev/infiniband/ (bsc#914742).

  - CVE-2015-1465: The IPv4 implementation in the Linux     kernel before 3.18.8 did not properly consider the     length of the Read-Copy Update (RCU) grace period for     redirecting lookups in the absence of caching, which     allowed remote attackers to cause a denial of service     (memory consumption or system crash) via a flood of     packets (bsc#916225).

  - CVE-2015-2041: net/llc/sysctl_net_llc.c in the Linux     kernel before 3.19 used an incorrect data type in a     sysctl table, which allowed local users to obtain     potentially sensitive information from kernel memory or     possibly have unspecified other impact by accessing a     sysctl entry (bsc#919007).

  - CVE-2015-2042: net/rds/sysctl.c in the Linux kernel     before 3.19 used an incorrect data type in a sysctl     table, which allowed local users to obtain potentially     sensitive information from kernel memory or possibly     have unspecified other impact by accessing a sysctl     entry (bsc#919018).

  - CVE-2015-2666: Fixed a flaw that allowed crafted     microcode to overflow the kernel stack (bsc#922944).

  - CVE-2015-2830: Fixed int80 fork from 64-bit tasks     mishandling (bsc#926240).

  - CVE-2015-2922: Fixed possible denial of service (DoS)     attack against IPv6 network stacks due to improper     handling of Router Advertisements (bsc#922583).

  - CVE-2015-3331: Fixed buffer overruns in RFC4106     implementation using AESNI (bsc#927257).

  - CVE-2015-3332: Fixed TCP Fast Open local DoS     (bsc#928135).

  - CVE-2015-3339: Fixed race condition flaw between the     chown() and execve() system calls which could have lead     to local privilege escalation (bsc#928130).

  - CVE-2015-3636: Fixed use-after-free in ping sockets     which could have lead to local privilege escalation     (bsc#929525).

The update package also includes non-security fixes. See advisory for details.

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE 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
78715	Fedora 20 : kernel-3.16.6-202.fc20 (2014-13558)	Nessus	Fedora Local Security Checks	10/29/2014	1/11/2021	high
80168	Ubuntu 14.10 : linux regression (USN-2448-2)	Nessus	Ubuntu Local Security Checks	12/22/2014	1/19/2021	high
78610	Fedora 21 : kernel-3.17.1-302.fc21 (2014-13222)	Nessus	Fedora Local Security Checks	10/22/2014	1/11/2021	medium
81626	RHEL 7 : kernel (RHSA-2015:0290)	Nessus	Red Hat Local Security Checks	3/5/2015	11/4/2024	high
81800	Oracle Linux 7 : kernel (ELSA-2015-0290)	Nessus	Oracle Linux Local Security Checks	3/13/2015	2/9/2026	high
82254	Scientific Linux Security Update : kernel on SL7.x x86_64 (20150305)	Nessus	Scientific Linux Local Security Checks	3/26/2015	1/14/2021	high
84227	SUSE SLED12 / SLES12 Security Update : kernel (SUSE-SU-2015:1071-1)	Nessus	SuSE Local Security Checks	6/17/2015	1/6/2021	medium

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