Medium: kernel

Issue Overview:

The journal_unmap_buffer function in fs/jbd2/transaction.c in the Linux kernel before 3.3.1 does not properly handle the _Delay and _Unwritten buffer head states, which allows local users to cause a denial of service (system crash) by leveraging the presence of an ext4 filesystem that was mounted with a journal.

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:  
    kernel-debuginfo-common-i686-2.6.35.14-107.1.36.amzn1.i686  
    kernel-debuginfo-2.6.35.14-107.1.36.amzn1.i686  
    kernel-headers-2.6.35.14-107.1.36.amzn1.i686  
    kernel-devel-2.6.35.14-107.1.36.amzn1.i686  
    kernel-2.6.35.14-107.1.36.amzn1.i686  
    perf-2.6.35.14-107.1.36.amzn1.i686  
  
noarch:  
    kernel-doc-2.6.35.14-107.1.36.amzn1.noarch  
  
src:  
    kernel-2.6.35.14-107.1.36.amzn1.src  
  
x86_64:  
    perf-2.6.35.14-107.1.36.amzn1.x86_64  
    kernel-devel-2.6.35.14-107.1.36.amzn1.x86_64  
    kernel-debuginfo-common-x86_64-2.6.35.14-107.1.36.amzn1.x86_64  
    kernel-headers-2.6.35.14-107.1.36.amzn1.x86_64  
    kernel-2.6.35.14-107.1.36.amzn1.x86_64  
    kernel-debuginfo-2.6.35.14-107.1.36.amzn1.x86_64  

Additional References

Red Hat: CVE-2011-4086

Mitre: CVE-2011-4086