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redhatRedHatRHSA-2012:0358
HistoryMar 06, 2012 - 12:00 a.m.

(RHSA-2012:0358) Important: kernel security and bug fix update

2012-03-0600:00:00
access.redhat.com
21

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

7.8 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:L/Au:N/C:N/I:N/A:C

0.012 Low

EPSS

Percentile

83.7%

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issues:

  • Using PCI passthrough without interrupt remapping support allowed Xen
    hypervisor guests to generate MSI interrupts and thus potentially inject
    traps. A privileged guest user could use this flaw to crash the host or
    possibly escalate their privileges on the host. The fix for this issue can
    prevent PCI passthrough working and guests starting. Refer to Red Hat
    Bugzilla bug 715555 for details. (CVE-2011-1898, Important)

  • IPv6 fragment identification value generation could allow a remote
    attacker to disrupt a target system’s networking, preventing legitimate
    users from accessing its services. (CVE-2011-2699, Important)

  • Using the SG_IO ioctl to issue SCSI requests to partitions or LVM volumes
    resulted in the requests being passed to the underlying block device. If a
    privileged user only had access to a single partition or LVM volume, they
    could use this flaw to bypass those restrictions and gain read and write
    access (and be able to issue other SCSI commands) to the entire block
    device. Refer to Red Hat Knowledgebase article 67869, linked to in the
    References, for further details about this issue. (CVE-2011-4127,
    Important)

  • A flaw was found in the way the Linux kernel handled robust list pointers
    of user-space held futexes across exec() calls. A local, unprivileged user
    could use this flaw to cause a denial of service or, eventually, escalate
    their privileges. (CVE-2012-0028, Important)

  • A missing boundary check was found in the Linux kernel’s HFS file system
    implementation. A local attacker could use this flaw to cause a denial of
    service or escalate their privileges by mounting a specially-crafted disk.
    (CVE-2011-4330, Moderate)

Red Hat would like to thank Fernando Gont for reporting CVE-2011-2699, and
Clement Lecigne for reporting CVE-2011-4330.

This update also fixes the following bugs:

  • Previously, all timers for a Xen fully-virtualized domain were based on
    the time stamp counter (TSC) of the underlying physical CPU. This could
    cause observed time to go backwards on some hosts. This update moves all
    timers except HPET to the Xen monotonic system time, which fixes the bug as
    long as the HPET is removed from the configuration of the domain.
    (BZ#773359)

  • Previously, tests of the Microsoft Server Virtualization Validation
    Program (SVVP) detected unreliability of the emulated HPET (High
    Performance Event Timer) on some hosts. Now, HPET can be configured as a
    per-domain configuration option; if it is disabled, the guest chooses a
    more reliable timer source. Disabling HPET is suggested for Windows guests,
    as well as fully-virtualized Linux guests that show occasional “time went
    backwards” errors in the console. (BZ#773360)

  • SG_IO ioctls were not implemented correctly in the Red Hat Enterprise
    Linux 5 virtio-blk driver. Sending an SG_IO ioctl request to a virtio-blk
    disk caused the sending thread to enter an uninterruptible sleep state (“D”
    state). With this update, SG_IO ioctls are rejected by the virtio-blk
    driver; the ioctl system call simply returns an ENOTTY (“Inappropriate
    ioctl for device”) error and the thread continues normally. (BZ#784658)

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.

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

7.8 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:L/Au:N/C:N/I:N/A:C

0.012 Low

EPSS

Percentile

83.7%