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CVE-2011-4622

Status Candidate

Overview

The create_pit_timer function in arch/x86/kvm/i8254.c in KVM 83, and possibly other versions, does not properly handle when Programmable Interval Timer (PIT) interrupt requests (IRQs) when a virtual interrupt controller (irqchip) is not available, which allows local users to cause a denial of service (NULL pointer dereference) by starting a timer.

Related Files

Ubuntu Security Notice USN-1389-1
Posted Mar 7, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1389-1 - Paolo Bonzini discovered a flaw in Linux's handling of the SG_IO ioctl command. A local user, or user in a VM could exploit this flaw to bypass restrictions and gain read/write access to all data on the affected block device. Sasha Levin discovered a flaw in the permission checking for device assignments requested via the kvm ioctl in the Linux kernel. A local user could use this flaw to crash the system causing a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2011-4127, CVE-2011-4347, CVE-2011-4622, CVE-2012-0038, CVE-2012-0879, CVE-2011-4127, CVE-2011-4347, CVE-2011-4622, CVE-2012-0038, CVE-2012-0879
MD5 | 7524468bd6b3bc1f8036dba3bffd7cd1
Red Hat Security Advisory 2012-0350-01
Posted Mar 6, 2012
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2012-0350-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. A buffer overflow flaw was found in the way the Linux kernel's XFS file system implementation handled links with overly long path names. A local, unprivileged user could use this flaw to cause a denial of service or escalate their privileges by mounting a specially-crafted disk.

tags | advisory, denial of service, overflow, kernel, local
systems | linux, redhat
advisories | CVE-2011-4077, CVE-2011-4081, CVE-2011-4132, CVE-2011-4347, CVE-2011-4594, CVE-2011-4611, CVE-2011-4622, CVE-2012-0038, CVE-2012-0045, CVE-2012-0207
MD5 | 359dbdebd900cec5fe4f8ee48ae3f1ec
Ubuntu Security Notice USN-1388-1
Posted Mar 6, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1388-1 - Paolo Bonzini discovered a flaw in Linux's handling of the SG_IO ioctl command. A local user, or user in a VM could exploit this flaw to bypass restrictions and gain read/write access to all data on the affected block device. A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual interrupt control is not available a local user could use this to cause a denial of service by starting a timer. Various other issues were also addressed.

tags | advisory, denial of service, local
systems | linux, ubuntu
advisories | CVE-2011-4127, CVE-2011-4622, CVE-2012-0038, CVE-2011-4127, CVE-2011-4622, CVE-2012-0038
MD5 | 42f8383ce233acca88536b742447984e
Ubuntu Security Notice USN-1387-1
Posted Mar 6, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1387-1 - Aristide Fattori and Roberto Paleari reported a flaw in the Linux kernel's handling of IPv4 icmp packets. A remote user could exploit this to cause a denial of service. A flaw was found in the Linux Ethernet bridge's handling of IGMP (Internet Group Management Protocol) packets. An unprivileged local user could exploit this flaw to crash the system. Han-Wen Nienhuys reported a flaw in the FUSE kernel module. A local user who can mount a FUSE file system could cause a denial of service. Various other issues were also addressed.

tags | advisory, remote, denial of service, kernel, local, protocol
systems | linux, ubuntu
advisories | CVE-2011-1927, CVE-2011-0716, CVE-2011-3353, CVE-2011-3619, CVE-2011-4622, CVE-2012-0038, CVE-2012-0044, CVE-2011-0716, CVE-2011-1927, CVE-2011-3353, CVE-2011-3619, CVE-2011-4622, CVE-2012-0038, CVE-2012-0044
MD5 | b0c9ddd8933c790af07fb3fcdbddec1e
Ubuntu Security Notice USN-1386-1
Posted Mar 6, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1386-1 - The linux kernel did not properly account for PTE pages when deciding which task to kill in out of memory conditions. A local, unprivileged could exploit this flaw to cause a denial of service. A flaw was discovered in the TOMOYO LSM's handling of mount system calls. An unprivileged user could oops the system causing a denial of service. Han-Wen Nienhuys reported a flaw in the FUSE kernel module. A local user who can mount a FUSE file system could cause a denial of service. Various other issues were also addressed.

tags | advisory, denial of service, kernel, local
systems | linux, ubuntu
advisories | CVE-2011-2498, CVE-2011-2518, CVE-2011-3353, CVE-2011-4097, CVE-2011-4622, CVE-2012-0038, CVE-2012-0044, CVE-2012-0207, CVE-2011-2498, CVE-2011-2518, CVE-2011-3353, CVE-2011-4097, CVE-2011-4622, CVE-2012-0038, CVE-2012-0044, CVE-2012-0207
MD5 | 0f5c9c2b1f8cdf33cb82a747daa13630
Ubuntu Security Notice USN-1384-1
Posted Mar 6, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1384-1 - A bug was discovered in the Linux kernel's calculation of OOM (Out of memory) scores, that would result in the wrong process being killed. A user could use this to kill the process with the highest OOM score, even if that process belongs to another user or the system. Paolo Bonzini discovered a flaw in Linux's handling of the SG_IO ioctl command. A local user, or user in a VM could exploit this flaw to bypass restrictions and gain read/write access to all data on the affected block device. Various other issues were also addressed.

tags | advisory, kernel, local
systems | linux, ubuntu
advisories | CVE-2011-4097, CVE-2011-4127, CVE-2011-4622, CVE-2012-0038, CVE-2012-0055, CVE-2012-0207, CVE-2011-4097, CVE-2011-4127, CVE-2011-4622, CVE-2012-0038, CVE-2012-0055, CVE-2012-0207
MD5 | 601dd54cccb27b3b2ac90280b970ac9f
Ubuntu Security Notice USN-1363-1
Posted Feb 13, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1363-1 - A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual interrupt control is not available a local user could use this to cause a denial of service by starting a timer. A flaw was discovered in the XFS filesystem. If a local user mounts a specially crafted XFS image it could potential execute arbitrary code on the system. Andy Whitcroft discovered a that the Overlayfs filesystem was not doing the extended permission checks needed by cgroups and Linux Security Modules (LSMs). A local user could exploit this to by-pass security policy and access files that should not be accessible. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, local
systems | linux, ubuntu
advisories | CVE-2011-4622, CVE-2012-0038, CVE-2012-0055, CVE-2012-0207, CVE-2011-4622, CVE-2012-0038, CVE-2012-0055, CVE-2012-0207
MD5 | 5272d68bea7e1475f014348307a446fd
Ubuntu Security Notice USN-1362-1
Posted Feb 13, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1362-1 - Han-Wen Nienhuys reported a flaw in the FUSE kernel module. A local user who can mount a FUSE file system could cause a denial of service. A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual interrupt control is not available a local user could use this to cause a denial of service by starting a timer. A flaw was discovered in the XFS filesystem. If a local user mounts a specially crafted XFS image it could potential execute arbitrary code on the system. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2011-3353, CVE-2011-4622, CVE-2012-0038, CVE-2012-0044, CVE-2011-3353, CVE-2011-4622, CVE-2012-0038, CVE-2012-0044
MD5 | c8bd4f245aecf49a5f4e2269db3087ad
Ubuntu Security Notice USN-1361-1
Posted Feb 13, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1361-1 - Han-Wen Nienhuys reported a flaw in the FUSE kernel module. A local user who can mount a FUSE file system could cause a denial of service. A flaw was found in KVM's Programmable Interval Timer (PIT). When a virtual interrupt control is not available a local user could use this to cause a denial of service by starting a timer. A flaw was discovered in the XFS filesystem. If a local user mounts a specially crafted XFS image it could potential execute arbitrary code on the system. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2011-3353, CVE-2011-4622, CVE-2012-0038, CVE-2012-0044, CVE-2011-3353, CVE-2011-4622, CVE-2012-0038, CVE-2012-0044
MD5 | fa193661ffe5a12b89efc1f4e8c772b7
Red Hat Security Advisory 2012-0051-01
Posted Jan 24, 2012
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2012-0051-01 - KVM is a full virtualization solution for Linux on AMD64 and Intel 64 systems. KVM is a Linux kernel module built for the standard Red Hat Enterprise Linux kernel. A heap overflow flaw was found in the way QEMU-KVM emulated the e1000 network interface card. A privileged guest user in a virtual machine whose network interface is configured to use the e1000 emulated driver could use this flaw to crash the host or, possibly, escalate their privileges on the host. A flaw was found in the way the KVM subsystem of a Linux kernel handled PIT IRQs when there was no virtual interrupt controller set up. A malicious user in the kvm group on the host could force this situation to occur, resulting in the host crashing.

tags | advisory, overflow, kernel
systems | linux, redhat
advisories | CVE-2011-4622, CVE-2012-0029
MD5 | eb412e012fdeeec9674c1901233256b0
Debian Security Advisory 2389-1
Posted Jan 16, 2012
Authored by Debian | Site debian.org

Debian Linux Security Advisory 2389-1 - Several vulnerabilities have been discovered in the Linux kernel that may lead to a denial of service or privilege escalation.

tags | advisory, denial of service, kernel, vulnerability
systems | linux, debian
advisories | CVE-2011-2183, CVE-2011-2213, CVE-2011-2898, CVE-2011-3353, CVE-2011-4077, CVE-2011-4110, CVE-2011-4127, CVE-2011-4611, CVE-2011-4622, CVE-2011-4914
MD5 | 32bf67cb13953699a69550235620efa8
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