Updated kernel packages that fix multiple security issues, address several hundred bugs, and add numerous enhancements are now available as part of the ongoing support and maintenance of Red Hat Enterprise Linux version 6. This is the fourth regular update.

The Red Hat Security Response Team has rated this update as having important security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

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

This update fixes the following security issues :

* A race condition was found in the way asynchronous I/O and fallocate() interacted when using the ext4 file system. A local, unprivileged user could use this flaw to expose random data from an extent whose data blocks have not yet been written, and thus contain data from a deleted file. (CVE-2012-4508, Important)

* A flaw was found in the way the vhost kernel module handled descriptors that spanned multiple regions. A privileged guest user in a KVM guest could use this flaw to crash the host or, potentially, escalate their privileges on the host. (CVE-2013-0311, Important)

* It was found that the default SCSI command filter does not accommodate commands that overlap across device classes. A privileged guest user could potentially use this flaw to write arbitrary data to a LUN that is passed-through as read-only. (CVE-2012-4542, Moderate)

* A flaw was found in the way the xen_failsafe_callback() function in the Linux kernel handled the failed iret (interrupt return) instruction notification from the Xen hypervisor. An unprivileged user in a 32-bit para-virtualized guest could use this flaw to crash the guest. (CVE-2013-0190, Moderate)

* A flaw was found in the way pmd_present() interacted with PROT_NONE memory ranges when transparent hugepages were in use. A local, unprivileged user could use this flaw to crash the system.
(CVE-2013-0309, Moderate)

* A flaw was found in the way CIPSO (Common IP Security Option) IP options were validated when set from user mode. A local user able to set CIPSO IP options on the socket could use this flaw to crash the system. (CVE-2013-0310, Moderate)

Red Hat would like to thank Theodore Ts'o for reporting CVE-2012-4508, and Andrew Cooper of Citrix for reporting CVE-2013-0190. Upstream acknowledges Dmitry Monakhov as the original reporter of CVE-2012-4508. The CVE-2012-4542 issue was discovered by Paolo Bonzini of Red Hat.

This update also fixes several hundred bugs and adds enhancements.
Refer to the Red Hat Enterprise Linux 6.4 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 6.4 Release Notes and Technical Notes. The system must be rebooted for this update to take effect.

The remote Oracle Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2013-0496 advisory.

    - [virt] xen: Fix stack corruption in xen_failsafe_callback for 32bit PVOPS guests (Andrew Jones) [896050]     {CVE-2013-0190}
    - [block] sg_io: use different default filters for each device class (Paolo Bonzini) [875361]     {CVE-2012-4542}
    - [block] sg_io: prepare for adding per-device-type filters (Paolo Bonzini) [875361] {CVE-2012-4542}
    - [virt] kvm: invalid opcode oops on SET_SREGS with OSXSAVE bit set (Petr Matousek) [862904]     {CVE-2012-4461}
    - [fs] exec: do not leave bprm->interp on stack (Josh Poimboeuf) [880146] {CVE-2012-4530}
    - [fs] exec: use -ELOOP for max recursion depth (Josh Poimboeuf) [880146] {CVE-2012-4530}
    - [kernel] kmod: make __request_module() killable (Oleg Nesterov) [819529] {CVE-2012-4398}
    - [kernel] kmod: introduce call_modprobe() helper (Oleg Nesterov) [819529] {CVE-2012-4398}
    - [kernel] usermodehelper: implement UMH_KILLABLE (Oleg Nesterov) [819529] {CVE-2012-4398}
    - [kernel] usermodehelper: introduce umh_complete(sub_info) (Oleg Nesterov) [819529] {CVE-2012-4398}
    - [kernel] call_usermodehelper: simplify/fix UMH_NO_WAIT case (Oleg Nesterov) [819529] {CVE-2012-4398}
    - [kernel] wait_for_helper: SIGCHLD from user-space can lead to use-after-free (Oleg Nesterov) [819529]     {CVE-2012-4398}

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.

The remote Oracle Linux 5 / 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2013-2520 advisory.

    - mm/hotplug: correctly add new zone to all other nodes' zone lists (Jiang Liu) [Orabug: 16603569]     {CVE-2012-5517}
    - ptrace: ptrace_resume() shouldn't wake up !TASK_TRACED thread (Oleg Nesterov) [Orabug: 16405868]     {CVE-2013-0871}
    - ptrace: ensure arch_ptrace/ptrace_request can never race with SIGKILL (Oleg Nesterov) [Orabug: 16405868]     {CVE-2013-0871}
    - ptrace: introduce signal_wake_up_state() and ptrace_signal_wake_up() (Oleg Nesterov) [Orabug: 16405868]     {CVE-2013-0871}
    - Bluetooth: Fix incorrect strncpy() in hidp_setup_hid() (Anderson Lizardo) [Orabug: 16711062]     {CVE-2013-0349}
    - dccp: check ccid before dereferencing (Mathias Krause) [Orabug: 16711040] {CVE-2013-1827}
    - USB: io_ti: Fix NULL dereference in chase_port() (Wolfgang Frisch) [Orabug: 16425435] {CVE-2013-1774}
    - keys: fix race with concurrent install_user_keyrings() (David Howells) [Orabug: 16493369]     {CVE-2013-1792}
    - KVM: Fix bounds checking in ioapic indirect register reads (CVE-2013-1798) (Andy Honig) [Orabug:
    16710937] {CVE-2013-1798}
    - KVM: x86: fix for buffer overflow in handling of MSR_KVM_SYSTEM_TIME (CVE-2013-1796) (Jerry Snitselaar)     [Orabug: 16710794] {CVE-2013-1796}
    - net/tun: fix ioctl() based info leaks (Mathias Krause) [Orabug: 16675501] {CVE-2012-6547}
    - atm: fix info leak via getsockname() (Mathias Krause) [Orabug: 16675501] {CVE-2012-6546}
    - atm: fix info leak in getsockopt(SO_ATMPVC) (Mathias Krause) [Orabug: 16675501] {CVE-2012-6546}
    - xfrm_user: fix info leak in copy_to_user_tmpl() (Mathias Krause) [Orabug: 16675501] {CVE-2012-6537}
    - xfrm_user: fix info leak in copy_to_user_policy() (Mathias Krause) [Orabug: 16675501] {CVE-2012-6537}
    - xfrm_user: fix info leak in copy_to_user_state() (Mathias Krause) [Orabug: 16675501] {CVE-2013-6537}
    - xfrm_user: return error pointer instead of NULL #2 (Mathias Krause) [Orabug: 16675501] {CVE-2013-1826}

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.

This Linux 3.6.5 stable update contains a large number of important bugfixes and security fixes.

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.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
65134	CentOS 6 : kernel (CESA-2013:0496)	Nessus	CentOS Local Security Checks	2013/3/10	2021/1/4	medium
68739	Oracle Linux 6 : kernel (ELSA-2013-0496)	Nessus	Oracle Linux Local Security Checks	2013/7/12	2026/2/9	high
68852	Oracle Linux 5 / 6 : Unbreakable Enterprise kernel (ELSA-2013-2520)	Nessus	Oracle Linux Local Security Checks	2013/7/12	2026/2/9	medium
62831	Fedora 16 : kernel-3.6.5-2.fc16 (2012-17479)	Nessus	Fedora Local Security Checks	2012/11/7	2021/1/11	medium

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