CVE-2017-12193: Null Pointer Dereference
First published: Thu Oct 12 2017(Updated: )
A flaw was found in the Linux kernels implementation of associative arrays introduced in 3.13. The Red Hat Enterprise Linux 7 kernel had back ported this functionality to the 3.10 kernels and was affected by this flaw. The flaw involved a null pointer dereference in assoc_array_apply_edit() due to incorrect node-splitting in assoc_array implementation. This did not affect all callers of of the associative array code, only those that would try todereference the assigned value, a kernel panic will occur. Upstream patch: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ea6789980fdaa610d7eb63602c746bf6ec70cd2b">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ea6789980fdaa610d7eb63602c746bf6ec70cd2b</a> Oss-security: <a href="http://seclists.org/oss-sec/2017/q4/181">http://seclists.org/oss-sec/2017/q4/181</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <4.13.11 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.133-1 6.12.21-1 6.12.22-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ea6789980fdaa610d7eb63602c746bf6ec70cd2b
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.11
- http://www.securityfocus.com/bid/101678
- https://access.redhat.com/errata/RHSA-2018:0151
- https://bugzilla.redhat.com/show_bug.cgi?id=1501215
- https://github.com/torvalds/linux/commit/ea6789980fdaa610d7eb63602c746bf6ec70cd2b
- https://usn.ubuntu.com/3698-1/
- https://usn.ubuntu.com/3698-2/
- https://launchpad.net/bugs/cve/CVE-2017-12193
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ea6789980fdaa610d7eb63602c746bf6ec70cd2b
- http://seclists.org/oss-sec/2017/q4/181
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1337630&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=1337630&action=edit
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1508717
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-12193
- https://nvd.nist.gov/vuln/detail/CVE-2017-12193
- https://security-tracker.debian.org/tracker/CVE-2017-12193
- https://ubuntu.com/security/CVE-2017-12193
- https://git.kernel.org/linus/ea6789980fdaa610d7eb63602c746bf6ec70cd2b
- https://git.kernel.org/linus/3cb989501c2688cacbb7dc4b0d353faf838f53a1
Frequently Asked Questions
What is the severity of CVE-2017-12193?
The severity of CVE-2017-12193 is considered moderate due to the potential for a null pointer dereference.
How do I fix CVE-2017-12193?
To fix CVE-2017-12193, you should upgrade to a patched version of the Linux kernel beyond 4.13.11.
Which Linux kernel versions are affected by CVE-2017-12193?
CVE-2017-12193 affects Linux kernel versions prior to 4.13.11, including backported versions in Red Hat Enterprise Linux 7.
What is the impact of CVE-2017-12193?
The impact of CVE-2017-12193 is a potential system crash due to a null pointer dereference in the associative arrays implementation.
Is CVE-2017-12193 specific to any Linux distributions?
CVE-2017-12193 is particularly noted in the Red Hat Enterprise Linux 7 kernel but may affect other distributions using the vulnerable kernel versions.
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