CVE-2014-5045: Use After Free
First published: Sun Jul 20 2014(Updated: )
A flaw was found in the way reference counting was handled in the Linux kernel's VFS subsystem when unmount on symlink was performed. On Red Hat Enterprise Linux 6 an unprivileged local user could use this flaw to cause OOM conditions leading to denial of service or, potentially, trigger use-after-free error. On Red Hat Enterprise Linux 7 a privileged local user with CAP_SYS_ADMIN capability (also in a container) could use this flaw to cause OOM conditions leading to denial of service or, potentially, trigger use-after-free error. Acknowledgements: Red Hat would like to thank Vasily Averin of Parallels for reporting this issue.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <0:2.6.32-504.el6 | 0:2.6.32-504.el6 |
| redhat/kernel | <0:2.6.32-431.46.2.el6 | 0:2.6.32-431.46.2.el6 |
| redhat/kernel | <0:3.10.0-123.13.1.el7 | 0:3.10.0-123.13.1.el7 |
| Linux Kernel | <3.15.8 | |
| Red Hat Enterprise Linux Server EUS | =6.5 | |
| Red Hat Enterprise Linux Server | =6.5 | |
| Red Hat Enterprise Linux Server | =6.5 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.133-1 6.12.22-1 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2014-5045 https://nvd.nist.gov/vuln/detail/CVE-2014-5045
- https://bugzilla.redhat.com/show_bug.cgi?id=1122472
- https://access.redhat.com/errata/RHSA-2014:1392
- https://access.redhat.com/errata/RHSA-2015:0062
- https://access.redhat.com/errata/RHSA-2014:1971
- https://access.redhat.com/security/cve/CVE-2014-5045
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=295dc39d941dc2ae53d5c170365af4c9d5c16212
- http://rhn.redhat.com/errata/RHSA-2015-0062.html
- http://secunia.com/advisories/60353
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.15.8
- http://www.openwall.com/lists/oss-security/2014/07/24/2
- http://www.securityfocus.com/bid/68862
- https://github.com/torvalds/linux/commit/295dc39d941dc2ae53d5c170365af4c9d5c16212
- https://launchpad.net/bugs/cve/CVE-2014-5045
- https://lkml.org/lkml/2014/7/21/98
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1122482
- https://rhn.redhat.com/errata/RHSA-2014-1392.html
- https://rhn.redhat.com/errata/RHSA-2014-1971.html
- https://rhn.redhat.com/errata/RHSA-2015-0062.html
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=295dc39d941dc2ae53d5c170365af4c9d5c16212
- https://security-tracker.debian.org/tracker/CVE-2014-5045
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-5045
- https://nvd.nist.gov/vuln/detail/CVE-2014-5045
- https://ubuntu.com/security/CVE-2014-5045
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the severity of CVE-2014-5045?
CVE-2014-5045 has a severity rating that indicates it could lead to Out of Memory (OOM) conditions and a potential denial of service.
How do I fix CVE-2014-5045?
To fix CVE-2014-5045, upgrade your kernel to the fixed versions provided by Red Hat or Debian as noted in the vulnerability details.
Who is affected by CVE-2014-5045?
CVE-2014-5045 affects unprivileged local users on Red Hat Enterprise Linux 6 who can exploit the flaw in the kernel's VFS subsystem.
What versions are vulnerable to CVE-2014-5045?
Vulnerable versions of the Linux kernel include versions prior to 2.6.32-504.el6 and specific Debian kernel versions listed in the vulnerability details.
Is there a patch available for CVE-2014-5045?
Yes, patches for CVE-2014-5045 are available as kernel updates from Red Hat and Debian.
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