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kernel: denial of service
| Package(s): | kernel |
CVE #(s): | CVE-2012-2934
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| Created: | June 12, 2012 |
Updated: | November 13, 2012 |
| Description: |
From the Red Hat advisory:
It was found that guests could trigger a bug in earlier AMD CPUs, leading
to a CPU hard lockup, when running on the Xen hypervisor implementation. An
unprivileged user in a 64-bit para-virtualized guest could use this flaw to
crash the host. Warning: After installing this update, hosts that are using
an affected AMD CPU (refer to Red Hat Bugzilla bug #824966 for a list) will
fail to boot. In order to boot such hosts, the new kernel parameter,
allow_unsafe, can be used ("allow_unsafe=on"). This option should only be
used with hosts that are running trusted guests, as setting it to "on"
reintroduces the flaw (allowing guests to crash the host). |
| Alerts: |
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