Use After Free Affecting kernel-debug-modules package, versions <0:4.18.0-240.el8
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Test your applications- Snyk ID SNYK-RHEL8-KERNELDEBUGMODULES-3821300
- published 7 Sep 2021
- disclosed 7 Sep 2021
Introduced: 7 Sep 2021
CVE-2021-3715 Open this link in a new tabHow to fix?
Upgrade RHEL:8 kernel-debug-modules to version 0:4.18.0-240.el8 or higher.
This issue was patched in RHSA-2020:4431.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debug-modules package and not the kernel-debug-modules package as distributed by RHEL.
See How to fix? for RHEL:8 relevant fixed versions and status.
A flaw was found in the "Routing decision" classifier in the Linux kernel's Traffic Control networking subsystem in the way it handled changing of classification filters, leading to a use-after-free condition. This flaw allows unprivileged local users to escalate their privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.
References
- https://access.redhat.com/security/cve/CVE-2021-3715
- https://access.redhat.com/errata/RHSA-2020:4431
- https://bugzilla.redhat.com/show_bug.cgi?id=1993988
- https://www.openwall.com/lists/oss-security/2021/09/07/1
- https://github.com/torvalds/linux/commit/ef299cc3fa1a9e1288665a9fdc8bff55629fd359
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef299cc3fa1a9e1288665a9fdc8bff55629fd359