Use After Free Affecting kernel-tools package, versions <0:4.18.0-305.3.1.el8_4
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Test your applications- Snyk ID SNYK-RHEL8-KERNELTOOLS-4049868
- published 26 Jul 2021
- disclosed 29 Apr 2021
How to fix?
Upgrade RHEL:8 kernel-tools to version 0:4.18.0-305.3.1.el8_4 or higher.
This issue was patched in RHSA-2021:2168.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-tools package and not the kernel-tools package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
A flaw null pointer dereference in the Nitro Enclaves kernel driver was found in the way that Enclaves VMs forces closures on the enclave file descriptor. A local user of a host machine could use this flaw to crash the system or escalate their privileges on the system.
References
- https://access.redhat.com/security/cve/CVE-2021-3543
- https://bugzilla.redhat.com/show_bug.cgi?id=1953022
- https://lore.kernel.org/lkml/20210429165941.27020-1-andraprs@amazon.com/
- https://access.redhat.com/errata/RHSA-2021:2168
- https://lore.kernel.org/lkml/20210429165941.27020-2-andraprs@amazon.com/
- https://lore.kernel.org/lkml/20210429165941.27020-2-andraprs%40amazon.com/