high
8.1
CWE
362 416
Advisory Published
CVE Published
Updated

CVE-2019-6974: Race Condition

First published: Sat Feb 02 2019(Updated: )

A use after free issue was found in the way Linux kernel's KVM hypervisor implements its device control API. While creating a device via kvm_ioctl_create_device(), device holds a reference to a VM object, latter this reference is transferred to caller's file descriptor table. If such file descriptor was to be closed, reference count to the VM object could become zero, potentially leading to use-after-free issue latter. A user/process could use this flaw to crash the guest VM resulting in DoS issue OR potentially gain privileged access to a system. Upstream patch: --------------- -&gt; <a href="https://git.kernel.org/linus/cfa39381173d5f969daf43582c95ad679189cbc9">https://git.kernel.org/linus/cfa39381173d5f969daf43582c95ad679189cbc9</a> Reference: ---------- -&gt; <a href="https://www.openwall.com/lists/oss-security/2019/02/18/2">https://www.openwall.com/lists/oss-security/2019/02/18/2</a>

Credit: cve@mitre.org cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
Linux Kernel>=3.10<3.16.64
Linux Kernel>=3.17<3.18.136
Linux Kernel>=3.19<4.4.176
Linux Kernel>=4.5<4.9.156
Linux Kernel>=4.10<4.14.99
Linux Kernel>=4.15<4.19.21
Linux Kernel>=4.20<4.20.8
Debian Linux=8.0
Ubuntu=12.04
Ubuntu=14.04
Ubuntu=16.04
Ubuntu=18.04
Ubuntu=18.10
F5 Access Policy Manager>=13.0.0<=13.1.1
F5 Access Policy Manager>=14.0.0<=14.1.0
F5 Access Policy Manager>=15.0.0<15.1.0
F5 BIG-IP Advanced Firewall Manager>=13.0.0<=13.1.1
F5 BIG-IP Advanced Firewall Manager>=14.0.0<=14.1.0
F5 BIG-IP Advanced Firewall Manager>=15.0.0<15.1.0
F5 BIG-IP Analytics>=13.0.0<=13.1.1
F5 BIG-IP Analytics>=14.0.0<=14.1.0
F5 BIG-IP Analytics>=15.0.0<15.1.0
F5 BIG-IP Application Acceleration Manager>=13.0.0<=13.1.1
F5 BIG-IP Application Acceleration Manager>=14.0.0<=14.1.0
F5 BIG-IP Application Acceleration Manager>=15.0.0<15.1.0
F5 Application Security Manager>=13.0.0<=13.1.1
F5 Application Security Manager>=14.0.0<=14.1.0
F5 Application Security Manager>=15.0.0<15.1.0
F5 BIG-IP Edge Gateway>=13.0.0<=13.1.1
F5 BIG-IP Edge Gateway>=14.0.0<=14.1.0
F5 BIG-IP Edge Gateway>=15.0.0<15.1.0
F5 BIG-IP Fraud Protection Service>=13.0.0<=13.1.1
F5 BIG-IP Fraud Protection Service>=14.0.0<=14.1.0
F5 BIG-IP Fraud Protection Service>=15.0.0<15.1.0
Riverbed SteelApp Traffic Manager>=13.0.0<=13.1.1
Riverbed SteelApp Traffic Manager>=14.0.0<=14.1.0
Riverbed SteelApp Traffic Manager>=15.0.0<15.1.0
F5 BIG-IP Link Controller>=13.0.0<=13.1.1
F5 BIG-IP Link Controller>=14.0.0<=14.1.0
F5 BIG-IP Link Controller>=15.0.0<15.1.0
Riverbed SteelApp Traffic Manager>=13.0.0<=13.1.1
Riverbed SteelApp Traffic Manager>=14.0.0<=14.1.0
Riverbed SteelApp Traffic Manager>=15.0.0<15.1.0
F5 BIG-IP Policy Enforcement Manager>=13.0.0<=13.1.1
F5 BIG-IP Policy Enforcement Manager>=14.0.0<=14.1.0
F5 BIG-IP Policy Enforcement Manager>=15.0.0<15.1.0
F5 BIG-IP WebAccelerator>=13.0.0<=13.1.1
F5 BIG-IP WebAccelerator>=14.0.0<=14.1.0
F5 BIG-IP WebAccelerator>=15.0.0<15.1.0
Red Hat OpenShift Container Platform=3.11
Red Hat Enterprise Linux=7.0
Red Hat Enterprise Linux Desktop=7.0
Red Hat Enterprise Linux Server EUS=7.5
Red Hat Enterprise Linux Server=7.0
Red Hat Enterprise Linux Server=7.4
Red Hat Enterprise Linux Server=7.6
Red Hat Enterprise Linux Server=7.6
Red Hat Enterprise Linux Server=7.4
Red Hat Enterprise Linux Server=7.6
Red Hat Enterprise Linux Workstation=7.0
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

Remedy

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cfa39381173d5f969daf43582c95ad679189cbc9

Remedy

https://bugs.chromium.org/p/project-zero/issues/detail?id=1765

Remedy

https://github.com/torvalds/linux/commit/cfa39381173d5f969daf43582c95ad679189cbc9

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Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2019-6974?

    CVE-2019-6974 is classified as a high severity vulnerability due to its potential impact on the Linux kernel's KVM hypervisor.

  • How do I fix CVE-2019-6974?

    To address CVE-2019-6974, upgrade the Linux kernel to a version that includes the patch, such as those mentioned in the vulnerability details.

  • Which software versions are affected by CVE-2019-6974?

    CVE-2019-6974 affects various versions of the Linux kernel, specifically those between versions 3.10 to 5.x before the remedied versions.

  • What type of vulnerability is CVE-2019-6974?

    CVE-2019-6974 is categorized as a use after free vulnerability, which occurs when memory is accessed after it has been freed.

  • Can CVE-2019-6974 lead to unauthorized access?

    Yes, CVE-2019-6974 could potentially allow an attacker to gain unauthorized access or execute arbitrary code through exploitation.

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