Execution with Unnecessary Privileges Affecting kernel-rt-trace package, versions <0:3.10.0-693.21.1.rt56.639.el7
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RHEL7-KERNELRTTRACE-4815491
- published26 Jul 2021
- disclosed22 Jun 2017
Introduced: 22 Jun 2017
CVE-2017-7518 (opens in a new tab)How to fix?
Upgrade RHEL:7 kernel-rt-trace to version 0:3.10.0-693.21.1.rt56.639.el7 or higher.
This issue was patched in RHSA-2018:0412.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-trace package and not the kernel-rt-trace package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
A flaw was found in the Linux kernel before version 4.12 in the way the KVM module processed the trap flag(TF) bit in EFLAGS during emulation of the syscall instruction, which leads to a debug exception(#DB) being raised in the guest stack. A user/process inside a guest could use this flaw to potentially escalate their privileges inside the guest. Linux guests are not affected by this.
References
- http://www.securityfocus.com/bid/99263
- https://access.redhat.com/articles/3290921
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-7518
- https://access.redhat.com/security/cve/CVE-2017-7518
- https://www.debian.org/security/2017/dsa-3981
- https://www.spinics.net/lists/kvm/msg151817.html
- http://www.openwall.com/lists/oss-security/2017/06/23/5
- https://access.redhat.com/errata/RHSA-2018:0412
- http://www.securitytracker.com/id/1038782
- https://usn.ubuntu.com/3619-1/
- https://usn.ubuntu.com/3619-2/
- https://usn.ubuntu.com/3754-1/