Medium: kernel

Issue Overview:

The Linux kernel did not properly suppress hugetlbfs support in x86 PV guests, which could allow local PV guest users to cause a denial of service (guest OS crash) by attempting to access a hugetlbfs mapped area. (CVE-2016-3961 / XSA-174)

A flaw was found in the way the Linux kernel’s ASN.1 DER decoder processed certain certificate files with tags of indefinite length. A local, unprivileged user could use a specially crafted X.509 certificate DER file to crash the system or, potentially, escalate their privileges on the system. (CVE-2016-0758)

Multiple race conditions in the ext4 filesystem implementation in the Linux kernel before 4.5 allow local users to cause a denial of service (disk corruption) by writing to a page that is associated with a different user’s file after unsynchronized hole punching and page-fault handling. (CVE-2015-8839)

The following flaws were also fixed in this version:

CVE-2016-4557: Use after free vulnerability via double fdput
CVE-2016-4581: Slave being first propagated copy causes oops in propagate_mnt
CVE-2016-4486: Information leak in rtnetlink
CVE-2016-4485: Information leak in llc module
CVE-2016-4558: bpf: refcnt overflow
CVE-2016-4565: infiniband: Unprivileged process can overwrite kernel memory using rdma_ucm.ko
CVE-2016-0758: tags with indefinite length can corrupt pointers in asn1_find_indefinite_length()
CVE-2015-8839: ext4 filesystem page fault race condition with fallocate call.

Affected Packages:

kernel

Issue Correction:
Run yum update kernel to update your system.

New Packages:

i686:  
    perf-debuginfo-4.4.10-22.54.amzn1.i686  
    kernel-headers-4.4.10-22.54.amzn1.i686  
    kernel-tools-debuginfo-4.4.10-22.54.amzn1.i686  
    perf-4.4.10-22.54.amzn1.i686  
    kernel-4.4.10-22.54.amzn1.i686  
    kernel-debuginfo-common-i686-4.4.10-22.54.amzn1.i686  
    kernel-devel-4.4.10-22.54.amzn1.i686  
    kernel-tools-4.4.10-22.54.amzn1.i686  
    kernel-tools-devel-4.4.10-22.54.amzn1.i686  
    kernel-debuginfo-4.4.10-22.54.amzn1.i686  
  
noarch:  
    kernel-doc-4.4.10-22.54.amzn1.noarch  
  
src:  
    kernel-4.4.10-22.54.amzn1.src  
  
x86_64:  
    kernel-tools-4.4.10-22.54.amzn1.x86_64  
    perf-4.4.10-22.54.amzn1.x86_64  
    kernel-tools-debuginfo-4.4.10-22.54.amzn1.x86_64  
    perf-debuginfo-4.4.10-22.54.amzn1.x86_64  
    kernel-devel-4.4.10-22.54.amzn1.x86_64  
    kernel-4.4.10-22.54.amzn1.x86_64  
    kernel-headers-4.4.10-22.54.amzn1.x86_64  
    kernel-debuginfo-common-x86_64-4.4.10-22.54.amzn1.x86_64  
    kernel-debuginfo-4.4.10-22.54.amzn1.x86_64  
    kernel-tools-devel-4.4.10-22.54.amzn1.x86_64  

Additional References

Red Hat: CVE-2015-8839, CVE-2016-0758, CVE-2016-3961, CVE-2016-4485, CVE-2016-4486, CVE-2016-4557, CVE-2016-4558, CVE-2016-4565, CVE-2016-4581

Mitre: CVE-2015-8839, CVE-2016-0758, CVE-2016-3961, CVE-2016-4485, CVE-2016-4486, CVE-2016-4557, CVE-2016-4558, CVE-2016-4565, CVE-2016-4581