Medium: kernel

Issue Overview:

The epoll implementation in the Linux kernel 2.6.37.2 and earlier does not properly traverse a tree of epoll file descriptors, which allows local users to cause a denial of service (CPU consumption) via a crafted application that makes epoll_create and epoll_ctl system calls.

Buffer overflow in the xfs_readlink function in fs/xfs/xfs_vnodeops.c in XFS in the Linux kernel 2.6, when CONFIG_XFS_DEBUG is disabled, allows local users to cause a denial of service (memory corruption and crash) and possibly execute arbitrary code via an XFS image containing a symbolic link with a long pathname.

crypto/ghash-generic.c in the Linux kernel before 3.1 allows local users to cause a denial of service (NULL pointer dereference and OOPS) or possibly have unspecified other impact by triggering a failed or missing ghash_setkey function call, followed by a (1) ghash_update function call or (2) ghash_final function call, as demonstrated by a write operation on an AF_ALG socket.

Affected Packages:

kernel

Issue Correction:
Run yum update kernel to update your system. You will need to reboot your system in order for the new kernel to be running.

New Packages:

i686:  
    perf-2.6.35.14-103.47.amzn1.i686  
    kernel-devel-2.6.35.14-103.47.amzn1.i686  
    kernel-debuginfo-2.6.35.14-103.47.amzn1.i686  
    kernel-headers-2.6.35.14-103.47.amzn1.i686  
    kernel-debuginfo-common-i686-2.6.35.14-103.47.amzn1.i686  
    kernel-2.6.35.14-103.47.amzn1.i686  
  
noarch:  
    kernel-doc-2.6.35.14-103.47.amzn1.noarch  
  
src:  
    kernel-2.6.35.14-103.47.amzn1.src  
  
x86_64:  
    kernel-debuginfo-2.6.35.14-103.47.amzn1.x86_64  
    perf-2.6.35.14-103.47.amzn1.x86_64  
    kernel-2.6.35.14-103.47.amzn1.x86_64  
    kernel-headers-2.6.35.14-103.47.amzn1.x86_64  
    kernel-devel-2.6.35.14-103.47.amzn1.x86_64  
    kernel-debuginfo-common-x86_64-2.6.35.14-103.47.amzn1.x86_64  

Additional References

Red Hat: CVE-2011-1083, CVE-2011-4077, CVE-2011-4081

Mitre: CVE-2011-1083, CVE-2011-4077, CVE-2011-4081