Use After Free Affecting perf package, versions <0:4.18.0-305.el8
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Test your applications- Snyk ID SNYK-RHEL8-PERF-4010200
- published 26 Jul 2021
- disclosed 2 Dec 2020
Introduced: 2 Dec 2020
CVE-2020-27786 Open this link in a new tabHow to fix?
Upgrade RHEL:8 perf to version 0:4.18.0-305.el8 or higher.
This issue was patched in RHSA-2021:1578.
NVD Description
Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
A flaw was found in the Linux kernel’s implementation of MIDI, where an attacker with a local account and the permissions to issue ioctl commands to midi devices could trigger a use-after-free issue. A write to this specific memory while freed and before use causes the flow of execution to change and possibly allow for memory corruption or privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
References
- https://security.netapp.com/advisory/ntap-20210122-0002/
- https://access.redhat.com/security/cve/CVE-2020-27786
- https://bugzilla.redhat.com/show_bug.cgi?id=1900933
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c1f6e3c818dd734c30f6a7eeebf232ba2cf3181d
- http://www.openwall.com/lists/oss-security/2020/12/03/1
- https://access.redhat.com/errata/RHSA-2021:1578