Race Condition Affecting kernel package, versions <0:4.14.101-91.76.amzn2
Threat Intelligence
EPSS
3.67% (92nd
percentile)
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Test your applications- Snyk ID SNYK-AMZN2-KERNEL-1668949
- published 27 Sep 2021
- disclosed 15 Feb 2019
How to fix?
Upgrade Amazon-Linux:2 kernel to version 0:4.14.101-91.76.amzn2 or higher.
This issue was patched in ALAS2-2019-1165.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2 relevant fixed versions and status.
In the Linux kernel before 4.20.8, kvm_ioctl_create_device in virt/kvm/kvm_main.c mishandles reference counting because of a race condition, leading to a use-after-free.
References
- http://www.securityfocus.com/bid/107127
- https://support.f5.com/csp/article/K11186236
- https://support.f5.com/csp/article/K11186236?utm_source=f5support&utm_medium=RSS
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6974
- https://www.exploit-db.com/exploits/46388/
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cfa39381173d5f969daf43582c95ad679189cbc9
- https://bugs.chromium.org/p/project-zero/issues/detail?id=1765
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.99
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.21
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20.8
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.156
- https://github.com/torvalds/linux/commit/cfa39381173d5f969daf43582c95ad679189cbc9
- https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
- https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
- https://lists.debian.org/debian-lts-announce/2019/05/msg00002.html
- https://access.redhat.com/errata/RHBA-2019:0959
- https://access.redhat.com/errata/RHSA-2019:0818
- https://access.redhat.com/errata/RHSA-2019:0833
- https://access.redhat.com/errata/RHSA-2019:2809
- https://access.redhat.com/errata/RHSA-2019:3967
- https://access.redhat.com/errata/RHSA-2020:0103
- https://usn.ubuntu.com/3930-1/
- https://usn.ubuntu.com/3930-2/
- https://usn.ubuntu.com/3931-1/
- https://usn.ubuntu.com/3931-2/
- https://usn.ubuntu.com/3932-1/
- https://usn.ubuntu.com/3932-2/
- https://usn.ubuntu.com/3933-1/
- https://usn.ubuntu.com/3933-2/
- https://support.f5.com/csp/article/K11186236?utm_source=f5support&%3Butm_medium=RSS
CVSS Scores
version 3.1