A race condition leading to a NULL pointer dereference is discovered in the Linux kernel. It occurs during parallel invocation of install_user_keyrings & lookup_user_key routines. An unprivileged user could use this flaw to crash the system, resulting in DoS.
Statement: This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5. This issue affects the version of Linux kernel as shipped with Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG 2. Future kernel updates for Red Hat Enterprise MRG 2 may address this issue.
Acknowledgements: This issue was discovered by Mateusz Guzik of Red Hat EMEA GSS SEG Team.
Upstream fix: -> https://lkml.org/lkml/2013/3/6/535
Created kernel tracking bugs for this issue Affects: fedora-all [bug 919021]
kernel-3.8.2-206.fc18 has been pushed to the Fedora 18 stable repository. If problems still persist, please make note of it in this bug report.
kernel-3.8.3-103.fc17 has been pushed to the Fedora 17 stable repository. If problems still persist, please make note of it in this bug report.
This issue has been addressed in following products: Red Hat Enterprise Linux 6 Via RHSA-2013:0744 https://rhn.redhat.com/errata/RHSA-2013-0744.html
This issue has been addressed in following products: MRG for RHEL-6 v.2 Via RHSA-2013:0829 https://rhn.redhat.com/errata/RHSA-2013-0829.html
(In reply to Prasad J Pandit from comment #6) > Upstream fix: > -> https://lkml.org/lkml/2013/3/6/535 She the above correct, it's empty? Do we have a sha1 yet from Linus' tree?
Okay, I did some detective work and found out that this is meant. 0da9dfdd2cd9889201bc6f6f43580c99165cd087 https://patchwork.kernel.org/patch/2228431/