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redhatRedHatRHSA-2015:2645
HistoryDec 15, 2015 - 12:00 a.m.

(RHSA-2015:2645) Important: kernel security and bug fix update

2015-12-1500:00:00
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44

4.9 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

0.001 Low

EPSS

Percentile

30.1%

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

  • It was found that the x86 ISA (Instruction Set Architecture) is prone to
    a denial of service attack inside a virtualized environment in the form of
    an infinite loop in the microcode due to the way (sequential) delivering of
    benign exceptions such as #AC (alignment check exception) and #DB (debug
    exception) is handled. A privileged user inside a guest could use these
    flaws to create denial of service conditions on the host kernel.
    (CVE-2015-5307, CVE-2015-8104, Important)

Red Hat would like to thank Ben Serebrin of Google Inc. for reporting the
CVE-2015-5307 issue.

This update also fixes the following bugs:

  • With an IPv6 address on a bond and a slave failover, Unsolicited Neighbor
    Advertisement (UNA) was previously sent using the link global IPv6 address
    as source address. The underlying source code has been patched, and, after
    the failover in bonding, UNA is sent using both the corresponding link IPv6
    address and global IPv6 address of bond0 and bond0.vlan. (BZ#1258479)

  • Previously, Human Interface Device (HID) would run a report on an
    unaligned buffer, which could cause a page fault interrupt and an oops when
    the end of the report was read. This update fixes this bug by padding the
    end of the report with extra bytes, so the reading of the report never
    crosses a page boundary. As a result, a page fault and subsequent oops no
    longer occur. (BZ#1268201)

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. The system must be
rebooted for this update to take effect.

4.9 Medium

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

0.001 Low

EPSS

Percentile

30.1%