Use After Free Affecting perf package, versions <0:4.18.0-305.40.1.el8_4
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Test your applications- Snyk ID SNYK-RHEL8-PERF-4160440
- published 30 Nov 2021
- disclosed 4 Oct 2021
Introduced: 4 Oct 2021
CVE-2021-4028 Open this link in a new tabHow to fix?
Upgrade RHEL:8 perf to version 0:4.18.0-305.40.1.el8_4 or higher.
This issue was patched in RHSA-2022:0777.
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 in the Linux kernel's implementation of RDMA communications manager listener code allowed an attacker with local access to setup a socket to listen on a high port allowing for a list element to be used after free. Given the ability to execute code, a local attacker could leverage this use-after-free to crash the system or possibly escalate privileges on the system.
References
- https://access.redhat.com/security/cve/CVE-2021-4028
- https://bugzilla.redhat.com/show_bug.cgi?id=2027201
- https://bugzilla.suse.com/show_bug.cgi?id=1193167#c0
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=bc0bdc5afaa74
- https://lkml.org/lkml/2021/10/4/697
- https://security.netapp.com/advisory/ntap-20221228-0002/