CVE-2017-18595: Use After Free
First published: Wed Sep 04 2019(Updated: )
A flaw was found in the allocate_trace_buffer in kernel/trace/trace.c in the debug subsystem, when failure to allocate a dynamic percpu area, a resource cleanup is called. The pointer (buf->buffer) still holds the address and is not set to NULL, which can cause a use-after-free problem, leading to a dangling pointer issue.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:3.10.0-1127.8.2.rt56.1103.el7 | 0:3.10.0-1127.8.2.rt56.1103.el7 |
| redhat/kernel | <0:3.10.0-1127.8.2.el7 | 0:3.10.0-1127.8.2.el7 |
| redhat/kernel-alt | <0:4.14.0-115.21.2.el7a | 0:4.14.0-115.21.2.el7a |
| redhat/kernel | <0:3.10.0-327.88.1.el7 | 0:3.10.0-327.88.1.el7 |
| redhat/kernel | <0:3.10.0-514.76.1.el7 | 0:3.10.0-514.76.1.el7 |
| redhat/kernel | <0:3.10.0-693.67.1.el7 | 0:3.10.0-693.67.1.el7 |
| redhat/kernel | <0:3.10.0-957.54.1.el7 | 0:3.10.0-957.54.1.el7 |
| redhat/kernel | <0:3.10.0-1062.26.1.el7 | 0:3.10.0-1062.26.1.el7 |
| redhat/kernel-rt | <1:3.10.0-693.67.1.rt56.665.el6 | 1:3.10.0-693.67.1.rt56.665.el6 |
| Linux Kernel | <4.14.11 | |
| SUSE Linux | =15.0 | |
| SUSE Linux | =15.1 | |
| Linux Kernel | >=3.10<3.16.55 | |
| Linux Kernel | >=3.17<3.18.91 | |
| Linux Kernel | >=3.19<4.1.50 | |
| Linux Kernel | >=4.2<4.4.109 | |
| Linux Kernel | >=4.5<4.9.74 | |
| Linux Kernel | >=4.10<4.14.11 |
Remedy
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.
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Reference Links
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00036.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00037.html
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.11
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4397f04575c44e1440ec2e49b6302785c95fd2f8
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1759138
- https://access.redhat.com/errata/RHSA-2020:2104
- https://access.redhat.com/security/cve/cve-2017-18595
- https://access.redhat.com/errata/RHSA-2020:2082
- https://access.redhat.com/errata/RHSA-2020:2085
- https://access.redhat.com/errata/RHSA-2020:2214
- https://access.redhat.com/errata/RHSA-2020:2242
- https://access.redhat.com/errata/RHSA-2020:2285
- https://access.redhat.com/errata/RHSA-2020:2277
- https://access.redhat.com/errata/RHSA-2020:2289
- https://access.redhat.com/errata/RHSA-2020:2522
- https://bugzilla.redhat.com/show_bug.cgi?id=1758671
- https://www.cve.org/CVERecord?id=CVE-2017-18595 https://nvd.nist.gov/vuln/detail/CVE-2017-18595
Parent vulnerabilities
(Appears in the following advisories)
Frequently Asked Questions
What is the severity of CVE-2017-18595?
CVE-2017-18595 is classified as a high severity vulnerability due to the potential for a use-after-free condition that could lead to arbitrary code execution.
How do I fix CVE-2017-18595?
To fix CVE-2017-18595, update to the appropriate remedied kernel versions specified in the vulnerability details, such as 0:3.10.0-1127.8.2.rt56.1103.el7 or equivalent.
Which kernel versions are affected by CVE-2017-18595?
CVE-2017-18595 affects various kernel versions, including several 3.10.x series and some 4.x series kernels up to 4.14.11.
What systems are primarily at risk from CVE-2017-18595?
CVE-2017-18595 primarily affects Linux-based systems running vulnerable kernel versions of Red Hat and openSUSE.
What are the potential impacts of CVE-2017-18595?
The potential impacts of CVE-2017-18595 include system crashes, arbitrary code execution, and unauthorized access to sensitive data.
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