Updated kernel packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate 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 flaw was found in the tcp_read_sock() function in the Linux kernel's IPv4 TCP/IP protocol suite implementation in the way socket buffers (skb) were handled. A local, unprivileged user could trigger this issue via a call to splice(), leading to a denial of service.
(CVE-2013-2128, Moderate)

* Information leak flaws in the Linux kernel could allow a local, unprivileged user to leak kernel memory to user-space. (CVE-2012-6548, CVE-2013-2634, CVE-2013-2635, CVE-2013-3222, CVE-2013-3224, CVE-2013-3225, Low)

* An information leak was found in the Linux kernel's POSIX signals implementation. A local, unprivileged user could use this flaw to bypass the Address Space Layout Randomization (ASLR) security feature.
(CVE-2013-0914, Low)

* A format string flaw was found in the ext3_msg() function in the Linux kernel's ext3 file system implementation. A local user who is able to mount an ext3 file system could use this flaw to cause a denial of service or, potentially, escalate their privileges.
(CVE-2013-1848, Low)

* A format string flaw was found in the b43_do_request_fw() function in the Linux kernel's b43 driver implementation. A local user who is able to specify the 'fwpostfix' b43 module parameter could use this flaw to cause a denial of service or, potentially, escalate their privileges. (CVE-2013-2852, Low)

* A NULL pointer dereference flaw was found in the Linux kernel's ftrace and function tracer implementations. A local user who has the CAP_SYS_ADMIN capability could use this flaw to cause a denial of service. (CVE-2013-3301, Low)

Red Hat would like to thank Kees Cook for reporting CVE-2013-2852.

This update also fixes several bugs. Documentation for these changes will be available shortly from the Technical Notes document linked to in the References section.

Users should upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

The remote Redhat Enterprise Linux 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2013:1080 advisory.

    Red Hat OpenStack 3.0 includes a custom Red Hat Enterprise Linux 6.4     kernel. These custom kernel packages include support for network     namespaces, this support is required to facilitate advanced OpenStack     Networking deployments.

    This update fixes the following security issues:

    * A flaw was found in the tcp_read_sock() function in the Linux kernel's     IPv4 TCP/IP protocol suite implementation in the way socket buffers (skb)     were handled. A local, unprivileged user could trigger this issue via a     call to splice(), leading to a denial of service. (CVE-2013-2128,     Moderate)

    * Information leak flaws in the Linux kernel could allow a local,     unprivileged user to leak kernel memory to user-space. (CVE-2012-6548,     CVE-2013-2634, CVE-2013-2635, CVE-2013-3222, CVE-2013-3224, CVE-2013-3225,     Low)

    * An information leak was found in the Linux kernel's POSIX signals     implementation. A local, unprivileged user could use this flaw to bypass     the Address Space Layout Randomization (ASLR) security feature.
    (CVE-2013-0914, Low)

    * A format string flaw was found in the ext3_msg() function in the Linux     kernel's ext3 file system implementation. A local user who is able to mount     an ext3 file system could use this flaw to cause a denial of service or,     potentially, escalate their privileges. (CVE-2013-1848, Low)

    * A format string flaw was found in the b43_do_request_fw() function in the     Linux kernel's b43 driver implementation. A local user who is able to     specify the fwpostfix b43 module parameter could use this flaw to cause a     denial of service or, potentially, escalate their privileges.
    (CVE-2013-2852, Low)

    * A NULL pointer dereference flaw was found in the Linux kernel's ftrace     and function tracer implementations. A local user who has the CAP_SYS_ADMIN     capability could use this flaw to cause a denial of service.
    (CVE-2013-3301, Low)

    Red Hat would like to thank Kees Cook for reporting CVE-2013-2852.

    More information on the Red Hat Enterprise Linux 6.4 kernel packages upon     which these custom kernel packages are based is available in     RHSA-2013:1051:

    https://rhn.redhat.com/errata/RHSA-2013-1051.html

    All Red Hat OpenStack 3.0 users deploying the OpenStack Networking service     are advised to install these updated packages.

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 6 host has packages installed that are affected by multiple vulnerabilities as referenced in the ELSA-2013-1051 advisory.

    - [wireless] b43: stop format string leaking into error msgs (John Linville) [971387 971389]     {CVE-2013-2852}
    - [net] rtnl: fix info leak on RTM_GETLINK request for VF devices (Flavio Leitner) [923657 923659]     {CVE-2013-2634 CVE-2013-2635}
    - [net] dcbnl: fix various netlink info leaks (Flavio Leitner) [923657 923659] {CVE-2013-2634     CVE-2013-2635}
    - [net] tcp: Fix oops from tcp_collapse() when using splice() (Nikola Pajkovsky) [968871 863512]     {CVE-2013-2128}
    - [net] bluetooth/rfcomm: Fix missing msg_namelen update in rfcomm_sock_recvmsg() (Weiping Pan) [955653     955654] {CVE-2013-3225}
    - [net] bluetooth: fix possible info leak in bt_sock_recvmsg() (Radomir Vrbovsky) [955603 955604]     {CVE-2013-3224}
    - [fs] udf: avoid info leak on export (Nikola Pajkovsky) [922354 922355] {CVE-2012-6548}
    - [kernel] tracing: Fix possible NULL pointer dereferences (Weiping Pan) [952212 952213] {CVE-2013-3301}
    - [kernel] tracing: Fix panic when lseek() called on 'trace' opened for writing (Weiping Pan) [952212     952213] {CVE-2013-3301}
    - [net] atm: update msg_namelen in vcc_recvmsg() (Nikola Pajkovsky) [955224 955225] {CVE-2013-3222}
    - [fs] ext3: Fix format string issues (Nikola Pajkovsky) [920784 920785] {CVE-2013-1848}
    - [kernel] signal: always clear sa_restorer on execve (Nikola Pajkovsky) [920505 920506] {CVE-2013-0914}

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 update fixes the following security issues :

  - A flaw was found in the tcp_read_sock() function in the     Linux kernel's IPv4 TCP/IP protocol suite implementation     in the way socket buffers (skb) were handled. A local,     unprivileged user could trigger this issue via a call to     splice(), leading to a denial of service.
    (CVE-2013-2128, Moderate)

  - Information leak flaws in the Linux kernel could allow a     local, unprivileged user to leak kernel memory to     user-space. (CVE-2012-6548, CVE-2013-2634,     CVE-2013-2635, CVE-2013-3222, CVE-2013-3224,     CVE-2013-3225, Low)

  - An information leak was found in the Linux kernel's     POSIX signals implementation. A local, unprivileged user     could use this flaw to bypass the Address Space Layout     Randomization (ASLR) security feature. (CVE-2013-0914,     Low)

  - A format string flaw was found in the ext3_msg()     function in the Linux kernel's ext3 file system     implementation. A local user who is able to mount an     ext3 file system could use this flaw to cause a denial     of service or, potentially, escalate their privileges.
    (CVE-2013-1848, Low)

  - A format string flaw was found in the     b43_do_request_fw() function in the Linux kernel's b43     driver implementation. A local user who is able to     specify the 'fwpostfix' b43 module parameter could use     this flaw to cause a denial of service or, potentially,     escalate their privileges. (CVE-2013-2852, Low)

  - A NULL pointer dereference flaw was found in the Linux     kernel's ftrace and function tracer implementations. A     local user who has the CAP_SYS_ADMIN capability could     use this flaw to cause a denial of service.
    (CVE-2013-3301, Low)

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

The bt_sock_recvmsg function in net/bluetooth/af_bluetooth.c in the Linux kernel before 3.9-rc7 does not properly initialize a certain length variable, which allows local users to obtain sensitive information from kernel stack memory via a crafted recvmsg or recvfrom system call.

The udf_encode_fh function in fs/udf/namei.c in the Linux kernel before 3.6 does not initialize a certain structure member, which allows local users to obtain sensitive information from kernel heap memory via a crafted application.

The ftrace implementation in the Linux kernel before 3.8.8 allows local users to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact by leveraging the CAP_SYS_ADMIN capability for write access to the (1) set_ftrace_pid or (2) set_graph_function file, and then making an lseek system call.

The rtnl_fill_ifinfo function in net/core/rtnetlink.c in the Linux kernel before 3.8.4 does not initialize a certain structure member, which allows local users to obtain sensitive information from kernel stack memory via a crafted application.

The ip6_sk_dst_check function in net/ipv6/ip6_output.c in the Linux kernel before 3.10 allows local users to cause a denial of service (system crash) by using an AF_INET6 socket for a connection to an IPv4 interface.

The tcp_read_sock function in net/ipv4/tcp.c in the Linux kernel before 2.6.34 does not properly manage skb consumption, which allows local users to cause a denial of service (system crash) via a crafted splice system call for a TCP socket.

The rfcomm_sock_recvmsg function in net/bluetooth/rfcomm/sock.c in the Linux kernel before 3.9-rc7 does not initialize a certain length variable, which allows local users to obtain sensitive information from kernel stack memory via a crafted recvmsg or recvfrom system call.

Format string vulnerability in the b43_request_firmware function in drivers/net/wireless/b43/main.c in the Broadcom B43 wireless driver in the Linux kernel through 3.9.4 allows local users to gain privileges by leveraging root access and including format string specifiers in an fwpostfix modprobe parameter, leading to improper construction of an error message.

The (1) key_notify_sa_flush and (2) key_notify_policy_flush functions in net/key/af_key.c in the Linux kernel before 3.10 do not initialize certain structure members, which allows local users to obtain sensitive information from kernel heap memory by reading a broadcast message from the notify interface of an IPSec key_socket.

The vcc_recvmsg function in net/atm/common.c in the Linux kernel before 3.9-rc7 does not initialize a certain length variable, which allows local users to obtain sensitive information from kernel stack memory via a crafted recvmsg or recvfrom system call.

The flush_signal_handlers function in kernel/signal.c in the Linux kernel before 3.8.4 preserves the value of the sa_restorer field across an exec operation, which makes it easier for local users to bypass the ASLR protection mechanism via a crafted application containing a sigaction system call.

net/dcb/dcbnl.c in the Linux kernel before 3.8.4 does not initialize certain structures, which allows local users to obtain sensitive information from kernel stack memory via a crafted application.

fs/ext3/super.c in the Linux kernel before 3.8.4 uses incorrect arguments to functions in certain circumstances related to printk input, which allows local users to conduct format-string attacks and possibly gain privileges via a crafted application.

net/ceph/auth_none.c in the Linux kernel through 3.10 allows remote attackers to cause a denial of service (NULL pointer dereference and system crash) or possibly have unspecified other impact via an auth_reply message that triggers an attempted build_request operation.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-001936 advisory.

    The tcp_read_sock function in net/ipv4/tcp.c in the Linux kernel before 2.6.34 does not properly manage     skb consumption, which allows local users to cause a denial of service (system crash) via a crafted splice     system call for a TCP socket.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-000972 advisory.

    The tcp_read_sock function in net/ipv4/tcp.c in the Linux kernel before 2.6.34 does not properly manage     skb consumption, which allows local users to cause a denial of service (system crash) via a crafted splice     system call for a TCP socket.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

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

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-002128 advisory.

    The tcp_read_sock function in net/ipv4/tcp.c in the Linux kernel before 2.6.34 does not properly manage     skb consumption, which allows local users to cause a denial of service (system crash) via a crafted splice     system call for a TCP socket.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

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

The remote MiracleLinux 4 host has packages installed that are affected by multiple vulnerabilities as referenced in the AXSA:2013-592:07 advisory.

    The kernel package contains the Linux kernel (vmlinuz), the core of any Linux operating system. The kernel     handles the basic functions of the operating system: memory allocation, process allocation, device input     and output, etc.
    Security issues fixed with this release:
     CVE-2012-6548     The udf_encode_fh function in fs/udf/namei.c in the Linux kernel before 3.6 does not initialize a certain     structure member, which allows local users to obtain sensitive information from kernel heap memory via a     crafted application.
     CVE-2013-0914     The flush_signal_handlers function in kernel/signal.c in the Linux kernel before 3.8.4 preserves the value     of the sa_restorer field across an exec operation, which makes it easier for local users to bypass the     ASLR protection mechanism via a crafted application containing a sigaction system call.
     CVE-2013-1848     fs/ext3/super.c in the Linux kernel before 3.8.4 uses incorrect arguments to functions in certain     circumstances related to printk input, which allows local users to conduct format-string attacks and     possibly gain privileges via a crafted application.
     CVE-2013-2128     The tcp_read_sock function in net/ipv4/tcp.c in the Linux kernel before 2.6.34 does not properly manage     skb consumption, which allows local users to cause a denial of service (system crash) via a crafted splice     system call for a TCP socket.
     CVE-2013-2634     net/dcb/dcbnl.c in the Linux kernel before 3.8.4 does not initialize certain structures, which allows     local users to obtain sensitive information from kernel stack memory via a crafted application.
     CVE-2013-2635     The rtnl_fill_ifinfo function in net/core/rtnetlink.c in the Linux kernel before 3.8.4 does not initialize     a certain structure member, which allows local users to obtain sensitive information from kernel stack     memory via a crafted application.
     CVE-2013-2852     Format string vulnerability in the b43_request_firmware function in drivers/net/wireless/b43/main.c in the     Broadcom B43 wireless driver in the Linux kernel through 3.9.4 allows local users to gain privileges by     leveraging root access and including format string specifiers in an fwpostfix modprobe parameter, leading     to improper construction of an error message.
     CVE-2013-3222     The vcc_recvmsg function in net/atm/common.c in the Linux kernel before 3.9-rc7 does not initialize a     certain length variable, which allows local users to obtain sensitive information from kernel stack memory     via a crafted recvmsg or recvfrom system call.
     CVE-2013-3224     The bt_sock_recvmsg function in net/bluetooth/af_bluetooth.c in the Linux kernel before 3.9-rc7 does not     properly initialize a certain length variable, which allows local users to obtain sensitive information     from kernel stack memory via a crafted recvmsg or recvfrom system call.
     CVE-2013-3225     The rfcomm_sock_recvmsg function in net/bluetooth/rfcomm/sock.c in the Linux kernel before 3.9-rc7 does     not initialize a certain length variable, which allows local users to obtain sensitive information from     kernel stack memory via a crafted recvmsg or recvfrom system call.
     CVE-2013-3301     The ftrace implementation in the Linux kernel before 3.8.8 allows local users to cause a denial of service     (NULL pointer dereference and system crash) or possibly have unspecified other impact by leveraging the     CAP_SYS_ADMIN capability for write access to the (1) set_ftrace_pid or (2) set_graph_function file, and     then making an lseek system call.

Tenable has extracted the preceding description block directly from the MiracleLinux security advisory.

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

ID	Name	Product	Family	Published	Updated	Severity
68940	CentOS 6 : kernel (CESA-2013:1051)	Nessus	CentOS Local Security Checks	7/18/2013	1/4/2021	medium
210186	RHEL 6 : kernel (RHSA-2013:1080)	Nessus	Red Hat Local Security Checks	11/4/2024	11/4/2024	medium
68920	Oracle Linux 6 : kernel (ELSA-2013-1051)	Nessus	Oracle Linux Local Security Checks	7/17/2013	2/9/2026	medium
68945	Scientific Linux Security Update : kernel on SL6.x i386/x86_64 (20130716)	Nessus	Scientific Linux Local Security Checks	7/18/2013	1/14/2021	medium
70222	Amazon Linux AMI : kernel (ALAS-2013-218)	Nessus	Amazon Linux Local Security Checks	10/1/2013	8/4/2020	medium
286556	Unity Linux 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-001936)	Nessus	Unity Linux Local Security Checks	1/15/2026	1/15/2026	medium
290436	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-000972)	Nessus	Unity Linux Local Security Checks	1/16/2026	1/16/2026	medium
287716	Unity Linux 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-002128)	Nessus	Unity Linux Local Security Checks	1/15/2026	1/15/2026	medium
290033	MiracleLinux 4 : kernel-2.6.32-358.14.1.el6 (AXSA:2013-592:07)	Nessus	Miracle Linux Local Security Checks	1/16/2026	1/19/2026	medium
68921	RHEL 6 : kernel (RHSA-2013:1051)	Nessus	Red Hat Local Security Checks	7/17/2013	1/14/2021	medium

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