CVE-2014-7843
First published: Thu Nov 13 2014(Updated: )
It was found that a read of n*PAGE_SIZE+1 from /dev/zero will cause the kernel to panic due to an unhandled exception since it's not handling the single byte case with a fixup (anything larger than a single byte will properly fault.) A local, unprivileged user could use this flaw to crash the system. Upstream patch proposal: <a href="https://lkml.org/lkml/2014/11/12/584">https://lkml.org/lkml/2014/11/12/584</a> Acknowledgements: This issue was discovered by Miloš Prchlík of Red Hat.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <=3.17.3 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.123-1 6.1.128-1 6.12.17-1 |
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Reference Links
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=97fc15436b36ee3956efad83e22a557991f7d19d
- http://secunia.com/advisories/62305
- http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.17.4
- http://www.openwall.com/lists/oss-security/2014/11/13/5
- http://www.securityfocus.com/bid/71082
- https://bugzilla.redhat.com/show_bug.cgi?id=1163744
- https://github.com/torvalds/linux/commit/97fc15436b36ee3956efad83e22a557991f7d19d
- https://launchpad.net/bugs/cve/CVE-2014-7843
- https://lkml.org/lkml/2014/11/12/584
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1163745
- https://security-tracker.debian.org/tracker/CVE-2014-7843
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-7843
- https://nvd.nist.gov/vuln/detail/CVE-2014-7843
- https://ubuntu.com/security/CVE-2014-7843
Frequently Asked Questions
What is the severity of CVE-2014-7843?
The severity of CVE-2014-7843 is considered high due to its potential to cause a kernel panic.
How do I fix CVE-2014-7843?
To fix CVE-2014-7843, update the Linux kernel to one of the patched versions such as 5.10.223-1 or later.
Which versions of Linux are affected by CVE-2014-7843?
CVE-2014-7843 affects Linux kernel versions up to and including 3.17.3.
Can CVE-2014-7843 be exploited by unprivileged users?
Yes, CVE-2014-7843 can be exploited by local, unprivileged users to crash the system.
What component of the system is impacted by CVE-2014-7843?
CVE-2014-7843 impacts the kernel's handling of reads from /dev/zero.
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