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Kernel Files

Debian Security Advisory 4117-1
Posted Feb 18, 2018
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4117-1 - This update doesn't fix a vulnerability in GCC itself, but instead provides support for building retpoline-enabled Linux kernel updates.

tags | advisory, kernel
systems | linux, debian
MD5 | 769be64f1b789883b6bd010a9e171ba7
Red Hat Security Advisory 2018-0292-01
Posted Feb 9, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0292-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions. There are three primary variants of the issue which differ in the way the speculative execution can be exploited. Note: This issue is present in hardware and cannot be fully fixed via software update. The updated kernel packages provide software mitigation for this hardware issue at a cost of potential performance penalty.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2017-5715, CVE-2017-5753, CVE-2017-5754
MD5 | 45f9b9030ba7dd1e43a55cdeb2d12c06
macOS AppleEmbeddedOSSupportHostClient::registerNotificationPort Use-After-Free
Posted Feb 8, 2018
Authored by Google Security Research, ianbeer

The macOS kernel suffers from a use-after-free issue due to a lack of locking in AppleEmbeddedOSSupportHostClient::registerNotificationPort.

tags | exploit, kernel
advisories | CVE-2018-4083
MD5 | ea0f5075fd72108cc6b63fbdbbf36665
Ubuntu Security Notice USN-3561-1
Posted Feb 8, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3561-1 - It was discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. An attacker in the guest could use this to expose sensitive guest information, including kernel memory. This update allows libvirt to expose new CPU features added by microcode updates to guests. On amd64 and i386, new CPU models that match the updated microcode features were added with an -IBRS suffix. Certain environments will require guests to be switched manually to the new CPU models after microcode updates have been applied to the host. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2017-5715
MD5 | 723edcb7a6f5e9a9cddff2b48c964a2f
Ubuntu Security Notice USN-3560-1
Posted Feb 7, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3560-1 - It was discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. An attacker in the guest could use this to expose sensitive guest information, including kernel memory. This update allows QEMU to expose new CPU features added by microcode updates to guests on amd64, i386, and s390x. On amd64 and i386, new CPU models that match the updated microcode features were added with an -IBRS suffix. Certain environments will require guests to be switched manually to the new CPU models after microcode updates have been applied to the host. Various other issues were also addressed.

tags | advisory, kernel
systems | linux, ubuntu
advisories | CVE-2017-5715
MD5 | a056895c22dbc010426c5ff911cbe55c
Slackware Security Advisory - Slackware 14.2 kernel Updates
Posted Feb 6, 2018
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New kernel packages are available for Slackware 14.2 to mitigate the speculative side channel attack known as Spectre variant 2.

tags | advisory, kernel
systems | linux, slackware
advisories | CVE-2017-5715
MD5 | a2f7f31b04b7a4504cf6f62ee6bd733e
Apport / ABRT chroot Privilege Escalation
Posted Feb 3, 2018
Authored by Tavis Ormandy, Brendan Coles, StA(c)phane Graber, Ricardo F. Teixeira | Site metasploit.com

This Metasploit module attempts to gain root privileges on Linux systems by invoking the default coredump handler inside a namespace ("container"). Apport versions 2.13 through 2.17.x before 2.17.1 on Ubuntu are vulnerable, due to a feature which allows forwarding reports to a container's Apport by changing the root directory before loading the crash report, causing 'usr/share/apport/apport' within the crashed task's directory to be executed. Similarly, Fedora is vulnerable when the kernel crash handler is configured to change root directory before executing ABRT, causing 'usr/libexec/abrt-hook-ccpp' within the crashed task's directory to be executed. In both instances, the crash handler does not drop privileges, resulting in code execution as root. This Metasploit module has been tested successfully on Apport 2.14.1 on Ubuntu 14.04.1 LTS x86 and x86_64 and ABRT on Fedora 19 and 20 x86_64.

tags | exploit, x86, kernel, root, code execution
systems | linux, fedora, ubuntu
advisories | CVE-2015-1318
MD5 | 1dc9fd5c90665c8934d2712e757240c3
Jailbreaking iOS 11.1.2 - An Adventure Into The XNU Kernel
Posted Feb 2, 2018
Authored by Bryce Berchell

Jailbreaking iOS 11.1.2 - An adventure into the XNU kernel.

tags | paper, kernel
systems | ios
MD5 | 93e70d65ed87ce7a4df0216aea36e705
Ubuntu Security Notice USN-3549-1
Posted Jan 30, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3549-1 - Jann Horn discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. A local attacker could use this to expose sensitive information, including kernel memory.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-5715, CVE-2017-5753
MD5 | e351d3919427f019b452313752353804
Ubuntu Security Notice USN-3548-2
Posted Jan 26, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3548-2 - USN-3548-1 fixed vulnerabilities in the Linux kernel for Ubuntu 17.10. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 17.10 for Ubuntu 16.04 LTS. Jay Vosburgh discovered a logic error in the x86-64 syscall entry implementation in the Linux kernel, introduced as part of the mitigations for the Spectre vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, x86, kernel, local, vulnerability
systems | linux, ubuntu
MD5 | 0d470581592ec8daa7fabea36ed96c69
Ubuntu Security Notice USN-3548-1
Posted Jan 26, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3548-1 - Jay Vosburgh discovered a logic error in the x86-64 syscall entry implementation in the Linux kernel, introduced as part of the mitigations for the Spectre vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, x86, kernel, local
systems | linux, ubuntu
MD5 | 98e4af140782a4a6f1256006225407f0
Red Hat Security Advisory 2018-0152-01
Posted Jan 25, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0152-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix: A flaw was found in the Linux kernel's key management system where it was possible for an attacker to escalate privileges or crash the machine. If a user key gets negatively instantiated, an error code is cached in the payload area. A negatively instantiated key may be then be positively instantiated by updating it with valid data. However, the ->update key type method must be aware that the error code may be there.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2015-8539, CVE-2017-15649, CVE-2017-7472
MD5 | 7ea7c52ac4b3e69c0c6b30b1a1ecc618
Red Hat Security Advisory 2018-0169-01
Posted Jan 25, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0169-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: An integer overflow vulnerability in ip6_find_1stfragopt() function was found. A local attacker that has privileges to open raw socket can cause an infinite loop inside the ip6_find_1stfragopt() function. The IPv6 fragmentation implementation in the Linux kernel does not consider that the nexthdr field may be associated with an invalid option, which allows local users to cause a denial of service or possibly have unspecified other impact via crafted socket and send system calls. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely.

tags | advisory, denial of service, overflow, kernel, local
systems | linux, redhat
advisories | CVE-2017-11176, CVE-2017-7542, CVE-2017-9074
MD5 | 9bb71d7fb0b138765d55e9fb093e9a9a
Red Hat Security Advisory 2018-0151-01
Posted Jan 25, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0151-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions. There are three primary variants of the issue which differ in the way the speculative execution can be exploited. Note: This issue is present in hardware and cannot be fully fixed via software update. The updated kernel packages provide software mitigation for this hardware issue at a cost of potential performance penalty. Please refer to References section for further information about this issue and the performance impact.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2015-8539, CVE-2017-12192, CVE-2017-12193, CVE-2017-15649, CVE-2017-7472
MD5 | 63358454c05371266a1bc969d13515ca
Red Hat Security Advisory 2018-0180-01
Posted Jan 25, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0180-01 - The kernel-alt packages provide the Linux kernel version 4.x. Security Fix: A flaw was found in the patches used to fix the 'dirtycow' vulnerability. An attacker, able to run local code, can exploit a race condition in transparent huge pages to modify usually read-only huge pages.

tags | advisory, kernel, local
systems | linux, redhat
advisories | CVE-2017-1000405
MD5 | 183909bb5d69472d7a91079d8bd18614
Red Hat Security Advisory 2018-0182-01
Posted Jan 25, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0182-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix: An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions. There are three primary variants of the issue which differ in the way the speculative execution can be exploited. Note: This issue is present in hardware and cannot be fully fixed via software update. The updated kernel packages provide software mitigation for this hardware issue at a cost of potential performance penalty.

tags | advisory, kernel
systems | linux, redhat
MD5 | d7b164fce4c5ff5146ed62ff8950ca59
Red Hat Security Advisory 2018-0181-01
Posted Jan 25, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0181-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix: A flaw was found in the Linux kernel's key management system where it was possible for an attacker to escalate privileges or crash the machine. If a user key gets negatively instantiated, an error code is cached in the payload area. A negatively instantiated key may be then be positively instantiated by updating it with valid data. However, the ->update key type method must be aware that the error code may be there.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2015-8539, CVE-2017-15649, CVE-2017-7472
MD5 | ceddb62691f1c5db1132685413f4438b
Ubuntu Security Notice USN-3541-2
Posted Jan 23, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3541-2 - USN-3541-1 addressed vulnerabilities in the Linux kernel for Ubuntu 17.10. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 17.10 for Ubuntu 16.04 LTS. Jann Horn discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. A local attacker could use this to expose sensitive information, including kernel memory. This update provides mitigations for the i386 , amd64, ppc64el, and s390x architectures. Various other issues were also addressed.

tags | advisory, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-5715, CVE-2017-5753, CVE-2017-5754
MD5 | 291d28710246bff8a81bbd02f296fde8
Ubuntu Security Notice USN-3542-2
Posted Jan 23, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3542-2 - USN-3542-1 addressed vulnerabilities in the Linux kernel for Ubuntu 14.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 14.04 LTS for Ubuntu 12.04 ESM. Jann Horn discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. A local attacker could use this to expose sensitive information, including kernel memory. This update provides mitigations for the i386 and amd64 architectures. Various other issues were also addressed.

tags | advisory, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-5715, CVE-2017-5753
MD5 | 346bb8be0070ef6410771167a6a887b1
Ubuntu Security Notice USN-3540-2
Posted Jan 23, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3540-2 - USN-3540-1 addressed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. Jann Horn discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. A local attacker could use this to expose sensitive information, including kernel memory. This update provides mitigations for the i386 , amd64, ppc64el, and s390x architectures. Various other issues were also addressed.

tags | advisory, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2017-5715, CVE-2017-5753, CVE-2017-5754
MD5 | 5604062afa06e52a2f671c515ed00022
Ubuntu Security Notice USN-3542-1
Posted Jan 23, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3542-1 - Jann Horn discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. A local attacker could use this to expose sensitive information, including kernel memory. This update provides mitigations for the i386 and amd64 architectures.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-5715, CVE-2017-5753
MD5 | 41674a2062e24cf04eb13a57feda1988
Ubuntu Security Notice USN-3541-1
Posted Jan 23, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3541-1 - Jann Horn discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. A local attacker could use this to expose sensitive information, including kernel memory. This update provides mitigations for the i386 , amd64, ppc64el, and s390x architectures. USN-3523-1 mitigated CVE-2017-5754 for the amd64 architecture in Ubuntu 17.10. This update provides the corresponding mitigations for the ppc64el architecture. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-5715, CVE-2017-5753, CVE-2017-5754
MD5 | 69072e250aabea00e31d00651148ced7
Ubuntu Security Notice USN-3540-1
Posted Jan 23, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3540-1 - Jann Horn discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. A local attacker could use this to expose sensitive information, including kernel memory. This update provides mitigations for the i386 , amd64, ppc64el, and s390x architectures. USN-3522-1 mitigated CVE-2017-5754 for the amd64 architecture in Ubuntu 16.04 LTS. This update provides the corresponding mitigations for the ppc64el architecture. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-5715, CVE-2017-5753, CVE-2017-5754
MD5 | 7e06ecbb56d7da89a0084ba43fb89939
Ubuntu Security Notice USN-3531-2
Posted Jan 22, 2018
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3531-2 - USN-3531-1 updated Intel microcode to the 20180108 release. Regressions were discovered in the microcode updates which could cause system instability on certain hardware platforms. At the request of Intel, we have reverted to the previous packaged microcode version, the 20170707 release. It was discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. A local attacker could use this to expose sensitive information, including kernel memory. This update provides the microcode updates required for the corresponding Linux kernel updates. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2017-5715
MD5 | 0835473431422f7929814224db8f57ff
Red Hat Security Advisory 2018-0104-01
Posted Jan 22, 2018
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2018-0104-01 - Kernel-based Virtual Machine is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm package provides the user-space component for running virtual machines that use KVM. Security Fix: An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions. There are three primary variants of the issue which differ in the way the speculative execution can be exploited. Variant CVE-2017-5715 triggers the speculative execution by utilizing branch target injection. It relies on the presence of a precisely-defined instruction sequence in the privileged code as well as the fact that memory accesses may cause allocation into the microprocessor's data cache even for speculatively executed instructions that never actually commit. As a result, an unprivileged attacker could use this flaw to cross the syscall and guest/host boundaries and read privileged memory by conducting targeted cache side-channel attacks.

tags | advisory, kernel
systems | linux, redhat
MD5 | 44d80b85853eaaf52a7278d956489fc0
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