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redhatRedHatRHSA-2012:0107
HistoryFeb 09, 2012 - 12:00 a.m.

(RHSA-2012:0107) Important: kernel security and bug fix update

2012-02-0900:00:00
access.redhat.com
29

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

0.037 Low

EPSS

Percentile

90.7%

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

This update fixes the following security issues:

  • 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 DOC-67874, 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 flaw was found in the Linux kernel in the way splitting two extents in
    ext4_ext_convert_to_initialized() worked. A local, unprivileged user with
    the ability to mount and unmount ext4 file systems could use this flaw to
    cause a denial of service. (CVE-2011-3638, Moderate)

  • A flaw was found in the way the Linux kernel’s journal_unmap_buffer()
    function handled buffer head states. On systems that have an ext4 file
    system with a journal mounted, a local, unprivileged user could use this
    flaw to cause a denial of service. (CVE-2011-4086, Moderate)

  • A divide-by-zero flaw was found in the Linux kernel’s igmp_heard_query()
    function. An attacker able to send certain IGMP (Internet Group Management
    Protocol) packets to a target system could use this flaw to cause a denial
    of service. (CVE-2012-0207, Moderate)

Red Hat would like to thank Zheng Liu for reporting CVE-2011-3638, and
Simon McVittie for reporting CVE-2012-0207.

This update also fixes the following bugs:

  • When a host was in recovery mode and a SCSI scan operation was initiated,
    the scan operation failed and provided no error output. This bug has been
    fixed and the SCSI layer now waits for recovery of the host to complete
    scan operations for devices. (BZ#772162)

  • 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 will simply return an ENOTTY (“Inappropriate
    ioctl for device”) error and the thread will continue normally. (BZ#773322)

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

0.037 Low

EPSS

Percentile

90.7%