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redhatRedHatRHSA-2015:1139
HistoryMay 20, 2015 - 10:22 a.m.

(RHSA-2015:1139) Important: kernel-rt security, bug fix, and enhancement update

2015-05-2010:22:57
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27

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

7.2 High

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

0.011 Low

EPSS

Percentile

82.6%

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

  • It was found that the Linux kernel’s implementation of vectored pipe read
    and write functionality did not take into account the I/O vectors that were
    already processed when retrying after a failed atomic access operation,
    potentially resulting in memory corruption due to an I/O vector array
    overrun. A local, unprivileged user could use this flaw to crash the system
    or, potentially, escalate their privileges on the system. (CVE-2015-1805,
    Important)

  • A race condition flaw was found in the way the Linux kernel keys
    management subsystem performed key garbage collection. A local attacker
    could attempt accessing a key while it was being garbage collected, which
    would cause the system to crash. (CVE-2014-9529, Moderate)

  • A flaw was found in the way the Linux kernel’s 32-bit emulation
    implementation handled forking or closing of a task with an ‘int80’ entry.
    A local user could potentially use this flaw to escalate their privileges
    on the system. (CVE-2015-2830, Low)

  • It was found that the Linux kernel’s ISO file system implementation did
    not correctly limit the traversal of Rock Ridge extension Continuation
    Entries (CE). An attacker with physical access to the system could use this
    flaw to trigger an infinite loop in the kernel, resulting in a denial of
    service. (CVE-2014-9420, Low)

  • An information leak flaw was found in the way the Linux kernel’s ISO9660
    file system implementation accessed data on an ISO9660 image with RockRidge
    Extension Reference (ER) records. An attacker with physical access to the
    system could use this flaw to disclose up to 255 bytes of kernel memory.
    (CVE-2014-9584, Low)

  • A flaw was found in the way the nft_flush_table() function of the Linux
    kernel’s netfilter tables implementation flushed rules that were
    referencing deleted chains. A local user who has the CAP_NET_ADMIN
    capability could use this flaw to crash the system. (CVE-2015-1573, Low)

  • An integer overflow flaw was found in the way the Linux kernel randomized
    the stack for processes on certain 64-bit architecture systems, such as
    x86-64, causing the stack entropy to be reduced by four. (CVE-2015-1593,
    Low)

Red Hat would like to thank Carl Henrik Lunde for reporting CVE-2014-9420
and CVE-2014-9584. The security impact of CVE-2015-1805 was discovered by
Red Hat.

The kernel-rt packages have been upgraded to version 3.10.0-229.7.2, which
provides a number of bug fixes and enhancements over the previous version,
including:

  • storvsc: get rid of overly verbose warning messages
  • storvsc: force discovery of LUNs that may have been removed
  • storvsc: in responce to a scan event, scan the hos
  • storvsc: NULL pointer dereference fix
  • futex: Mention key referencing differences between shared and private
    futexes
  • futex: Ensure get_futex_key_refs() always implies a barrier
  • kernel module: set nx before marking module MODULE_STATE_COMING
  • kernel module: Clean up ro/nx after early module load failures
  • btrfs: make xattr replace operations atomic
  • megaraid_sas: revert: Add release date and update driver version
  • radeon: fix kernel segfault in hwmonitor

(BZ#1223955)

Bug fix:

  • There is an XFS optimization that depended on a spinlock to disable
    preemption using the preempt_disable() function. When CONFIG_PREEMPT_RT is
    enabled on realtime kernels, spinlocks do not disable preemption while
    held, so the XFS critical section was not protected from preemption.
    Systems on the Realtime kernel-rt could lock up in this XFS optimization
    when a task that locked all the counters was then preempted by a realtime
    task, causing all callers of that lock to block indefinitely. This update
    disables the optimization when building a kernel with
    CONFIG_PREEMPT_RT_FULL enabled. (BZ#1223955)

All kernel-rt users are advised to upgrade to these updated packages, which
correct these issues and add these enhancements. The system must be
rebooted for this update to take effect.

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

7.2 High

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

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

0.011 Low

EPSS

Percentile

82.6%

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