CVE-2012-1179
First published: Thu Mar 15 2012(Updated: )
In some cases it may happen that pmd_none_or_clear_bad() is called with the mmap_sem hold in read mode. In those cases the huge page faults can allocate hugepmds under pmd_none_or_clear_bad() and that can trigger a false positive from pmd_bad() that will not like to see a pmd materializing as trans huge. A privileged user in the KVM guest can use this flaw to crash the host. An unprivileged local user could use this flaw to crash the system. Proposed upstream patch: <a href="http://comments.gmane.org/gmane.linux.kernel.mm/75413">http://comments.gmane.org/gmane.linux.kernel.mm/75413</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux-2.6 | ||
| Linux kernel | <=3.3 |
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Reference Links
- http://lists.fedoraproject.org/pipermail/package-announce/2012-March/075781.html
- http://lists.opensuse.org/opensuse-security-announce/2012-04/msg00021.html
- http://marc.info/?l=bugtraq&m=139447903326211&w=2
- http://rhn.redhat.com/errata/RHSA-2012-0743.html
- http://secunia.com/advisories/48404
- http://secunia.com/advisories/48898
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.3.1
- http://www.openwall.com/lists/oss-security/2012/03/15/7
- http://www.securitytracker.com/id?1027084
- https://bugzilla.redhat.com/show_bug.cgi?id=803793
- https://github.com/torvalds/linux/commit/4a1d704194a441bf83c636004a479e01360ec850
- http://marc.info/?l=bugtraq&m=139447903326211&w=2
- https://launchpad.net/bugs/cve/CVE-2012-1179
- http://comments.gmane.org/gmane.linux.kernel.mm/75413
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=803809
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=1a5a9906d4e8d1976b701f889d8f35d54b928f25
- https://rhn.redhat.com/errata/RHSA-2012-0743.html
- https://rhn.redhat.com/errata/RHSA-2012-1042.html
- https://security-tracker.debian.org/tracker/CVE-2012-1179
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-1179
- https://nvd.nist.gov/vuln/detail/CVE-2012-1179
- https://ubuntu.com/security/CVE-2012-1179
Frequently Asked Questions
What is the severity of CVE-2012-1179?
CVE-2012-1179 has a severity rating that indicates it can potentially lead to denial of service conditions under specific circumstances.
How do I fix CVE-2012-1179?
To fix CVE-2012-1179, it is recommended to update to a patched version of the Linux kernel that is above 3.3.
What versions of Linux kernel are affected by CVE-2012-1179?
CVE-2012-1179 affects Linux kernel versions up to and including 3.3.
What impact does CVE-2012-1179 have on system stability?
CVE-2012-1179 may cause system instability leading to potential hangs or crashes during memory allocation.
Can CVE-2012-1179 be exploited remotely?
CVE-2012-1179 is not typically exploitable remotely; it generally requires local access to the system.
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