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CVE-2015-2666

Status Candidate

Overview

Stack-based buffer overflow in the get_matching_model_microcode function in arch/x86/kernel/cpu/microcode/intel_early.c in the Linux kernel before 4.0 allows context-dependent attackers to gain privileges by constructing a crafted microcode header and leveraging root privileges for write access to the initrd.

Related Files

Red Hat Security Advisory 2015-1565-01
Posted Aug 6, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-1565-01 - The kernel-rt packages contain the Linux kernel, the core of any Linux operating system. An integer overflow flaw was found in the way the Linux kernel's netfilter connection tracking implementation loaded extensions. An attacker on a local network could potentially send a sequence of specially crafted packets that would initiate the loading of a large number of extensions, causing the targeted system in that network to crash. A stack-based buffer overflow flaw was found in the Linux kernel's early load microcode functionality. On a system with UEFI Secure Boot enabled, a local, privileged user could use this flaw to increase their privileges to the kernel level, bypassing intended restrictions in place.

tags | advisory, overflow, kernel, local
systems | linux, redhat
advisories | CVE-2014-9715, CVE-2015-2666, CVE-2015-2922, CVE-2015-3636
MD5 | a1d985b15707a20a9552d08c49cb6bdc
Red Hat Security Advisory 2015-1534-01
Posted Aug 6, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-1534-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. An integer overflow flaw was found in the way the Linux kernel's netfilter connection tracking implementation loaded extensions. An attacker on a local network could potentially send a sequence of specially crafted packets that would initiate the loading of a large number of extensions, causing the targeted system in that network to crash. A stack-based buffer overflow flaw was found in the Linux kernel's early load microcode functionality. On a system with UEFI Secure Boot enabled, a local, privileged user could use this flaw to increase their privileges to the kernel level, bypassing intended restrictions in place.

tags | advisory, overflow, kernel, local
systems | linux, redhat
advisories | CVE-2014-9715, CVE-2015-2666, CVE-2015-2922, CVE-2015-3636
MD5 | 7194f0fde43095d169b0958cfaf2adb8
Ubuntu Security Notice USN-2589-1
Posted Apr 30, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2589-1 - Jan Beulich discovered the Xen virtual machine subsystem of the Linux kernel did not properly restrict access to PCI command registers. A local guest user could exploit this flaw to cause a denial of service (host crash). A stack overflow was discovered in the the microcode loader for the intel x86 platform. A local attacker could exploit this flaw to cause a denial of service (kernel crash) or to potentially execute code with kernel privileges. Various other issues were also addressed.

tags | advisory, denial of service, overflow, x86, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-2150, CVE-2015-2666, CVE-2015-2830, CVE-2015-2922
MD5 | 6e90de114c3adbf14747291ec82baf89
Ubuntu Security Notice USN-2590-1
Posted Apr 30, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2590-1 - Jan Beulich discovered the Xen virtual machine subsystem of the Linux kernel did not properly restrict access to PCI command registers. A local guest user could exploit this flaw to cause a denial of service (host crash). A stack overflow was discovered in the the microcode loader for the intel x86 platform. A local attacker could exploit this flaw to cause a denial of service (kernel crash) or to potentially execute code with kernel privileges. Various other issues were also addressed.

tags | advisory, denial of service, overflow, x86, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-2150, CVE-2015-2666, CVE-2015-2830, CVE-2015-2922
MD5 | e216252bb6bfc2bf3f45e3ddbfbe3791
Ubuntu Security Notice USN-2588-1
Posted Apr 30, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2588-1 - A stack overflow was discovered in the the microcode loader for the intel x86 platform. A local attacker could exploit this flaw to cause a denial of service (kernel crash) or to potentially execute code with kernel privileges. It was discovered that the Linux kernel's IPv6 networking stack has a flaw that allows using route advertisement (RA) messages to set the 'hop_limit' to values that are too low. An unprivileged attacker on a local network could exploit this flaw to cause a denial of service (IPv6 messages dropped). Various other issues were also addressed.

tags | advisory, denial of service, overflow, x86, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-2666, CVE-2015-2922
MD5 | 8bc700dffe9412165378b51e52d7d62f
Ubuntu Security Notice USN-2587-1
Posted Apr 30, 2015
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2587-1 - A stack overflow was discovered in the the microcode loader for the intel x86 platform. A local attacker could exploit this flaw to cause a denial of service (kernel crash) or to potentially execute code with kernel privileges. It was discovered that the Linux kernel's IPv6 networking stack has a flaw that allows using route advertisement (RA) messages to set the 'hop_limit' to values that are too low. An unprivileged attacker on a local network could exploit this flaw to cause a denial of service (IPv6 messages dropped). Various other issues were also addressed.

tags | advisory, denial of service, overflow, x86, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-2666, CVE-2015-2922
MD5 | f4a6937e6756b2f6ec0c0117eb52018b
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