Use After Free Affecting kernel-cross-headers package, versions <0:4.18.0-193.el8
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Test your applications- Snyk ID SNYK-RHEL8-KERNELCROSSHEADERS-3732672
- published 26 Jul 2021
- disclosed 25 Nov 2019
Introduced: 25 Nov 2019
CVE-2020-10690 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-cross-headers to version 0:4.18.0-193.el8 or higher.
This issue was patched in RHSA-2020:1769.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-cross-headers package and not the kernel-cross-headers package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
There is a use-after-free in kernel versions before 5.5 due to a race condition between the release of ptp_clock and cdev while resource deallocation. When a (high privileged) process allocates a ptp device file (like /dev/ptpX) and voluntarily goes to sleep. During this time if the underlying device is removed, it can cause an exploitable condition as the process wakes up to terminate and clean all attached files. The system crashes due to the cdev structure being invalid (as already freed) which is pointed to by the inode.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2020-10690
- https://security.netapp.com/advisory/ntap-20200608-0001/
- https://access.redhat.com/security/cve/CVE-2020-10690
- https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
- https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
- https://access.redhat.com/errata/RHSA-2020:1769
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
- https://usn.ubuntu.com/4419-1/