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CVE-2012-2119

Status Candidate

Overview

Buffer overflow in the macvtap device driver in the Linux kernel before 3.4.5, when running in certain configurations, allows privileged KVM guest users to cause a denial of service (crash) via a long descriptor with a long vector length.

Related Files

Ubuntu Security Notice USN-1529-1
Posted Aug 13, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1529-1 - A flaw was discovered in the Linux kernel's macvtap device driver, which is used in KVM (Kernel-based Virtual Machine) to create a network bridge between host and guest. A privileged user in a guest could exploit this flaw to crash the host, if the vhost_net module is loaded with the experimental_zcopytx option enabled. An error was discovered in the Linux kernel's network TUN/TAP device implementation. A local user with access to the TUN/TAP interface (which is not available to unprivileged users until granted by a root user) could exploit this flaw to crash the system or potential gain administrative privileges. Various other issues were also addressed.

tags | advisory, kernel, local, root
systems | linux, ubuntu
advisories | CVE-2012-2119, CVE-2012-2136, CVE-2012-2137, CVE-2012-2372, CVE-2012-2373, CVE-2012-3364, CVE-2012-3375, CVE-2012-3400, CVE-2012-2119, CVE-2012-2136, CVE-2012-2137, CVE-2012-2372, CVE-2012-2373, CVE-2012-3364, CVE-2012-3375, CVE-2012-3400
SHA-256 | e952789bbefd461e15d40316c4fbdd6eac86480773556aab5265687085c3d735
Ubuntu Security Notice USN-1514-1
Posted Aug 13, 2012
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 1514-1 - A flaw was discovered in the Linux kernel's macvtap device driver, which is used in KVM (Kernel-based Virtual Machine) to create a network bridge between host and guest. A privileged user in a guest could exploit this flaw to crash the host, if the vhost_net module is loaded with the experimental_zcopytx option enabled. An error was discovered in the Linux kernel's network TUN/TAP device implementation. A local user with access to the TUN/TAP interface (which is not available to unprivileged users until granted by a root user) could exploit this flaw to crash the system or potential gain administrative privileges. Various other issues were also addressed.

tags | advisory, kernel, local, root
systems | linux, ubuntu
advisories | CVE-2012-2119, CVE-2012-2136, CVE-2012-2137, CVE-2012-2372, CVE-2012-2373, CVE-2012-3364, CVE-2012-3375, CVE-2012-3400, CVE-2012-2119, CVE-2012-2136, CVE-2012-2137, CVE-2012-2372, CVE-2012-2373, CVE-2012-3364, CVE-2012-3375, CVE-2012-3400
SHA-256 | e1c10bba69a8a49308a988c308242a9abe24b1f355d1cf1a0609f14097f65f5c
Red Hat Security Advisory 2012-0743-01
Posted Jun 18, 2012
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2012-0743-01 - The kernel packages contain the Linux kernel, the core of any Linux operating system. A local, unprivileged user could use an integer overflow flaw in drm_mode_dirtyfb_ioctl() to cause a denial of service or escalate their privileges. A buffer overflow flaw was found in the macvtap device driver, used for creating a bridged network between the guest and the host in KVM environments. A privileged guest user in a KVM guest could use this flaw to crash the host. Note: This issue only affected hosts that have the vhost_net module loaded with the experimental_zcopytx module option enabled, and that also have macvtap configured for at least one guest.

tags | advisory, denial of service, overflow, kernel, local
systems | linux, redhat
advisories | CVE-2012-0044, CVE-2012-1179, CVE-2012-2119, CVE-2012-2121, CVE-2012-2123, CVE-2012-2136, CVE-2012-2137, CVE-2012-2372, CVE-2012-2373
SHA-256 | 2480f3d6a1b6962283dd9e04ff5f1211daab9bed3388bb442c0b82afde24b21d
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