CVE-2017-2636: Race Condition
First published: Thu Mar 02 2017(Updated: )
A race condition flaw was found in the N_HLDC Linux kernel driver when accessing n_hdlc.tbuf that can lead to double free. A local, unprivileged user able to set the HDLC line discipline on the tty device could use this flaw to increase their privileges on the system.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=2.6.31<3.2.87 | |
| Linux Kernel | >=3.3<3.10.106 | |
| Linux Kernel | >=3.11<3.12.72 | |
| Linux Kernel | >=3.13<3.16.42 | |
| Linux Kernel | >=3.17<3.18.49 | |
| Linux Kernel | >=3.19<4.1.49 | |
| Linux Kernel | >=4.2<4.4.54 | |
| Linux Kernel | >=4.5<4.9.15 | |
| Linux Kernel | >=4.10<4.10.3 | |
| Debian Linux | =8.0 |
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Reference Links
- http://www.debian.org/security/2017/dsa-3804
- http://www.openwall.com/lists/oss-security/2017/03/07/6
- http://www.securityfocus.com/bid/96732
- http://www.securitytracker.com/id/1037963
- https://a13xp0p0v.github.io/2017/03/24/CVE-2017-2636.html
- https://access.redhat.com/errata/RHSA-2017:0892
- https://access.redhat.com/errata/RHSA-2017:0931
- https://access.redhat.com/errata/RHSA-2017:0932
- https://access.redhat.com/errata/RHSA-2017:0933
- https://access.redhat.com/errata/RHSA-2017:0986
- https://access.redhat.com/errata/RHSA-2017:1125
- https://access.redhat.com/errata/RHSA-2017:1126
- https://access.redhat.com/errata/RHSA-2017:1232
- https://access.redhat.com/errata/RHSA-2017:1233
- https://access.redhat.com/errata/RHSA-2017:1488
- https://bugzilla.redhat.com/show_bug.cgi?id=1428319
Frequently Asked Questions
What is the severity of CVE-2017-2636?
CVE-2017-2636 is classified as a high severity vulnerability due to its potential to allow privilege escalation.
Who is affected by CVE-2017-2636?
Local, unprivileged users on affected versions of the Linux kernel can exploit CVE-2017-2636.
How does CVE-2017-2636 exploit a vulnerability?
CVE-2017-2636 exploits a race condition in the N_HLDC Linux kernel driver leading to a double free condition.
How do I fix CVE-2017-2636?
To fix CVE-2017-2636, it is recommended to update to a patched version of the Linux kernel that resolves this issue.
What versions of the Linux kernel are affected by CVE-2017-2636?
CVE-2017-2636 affects various versions of the Linux kernel, specifically those between 2.6.31 and 4.10.3.
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