Incomplete Cleanup Affecting kernel-rt-kvm package, versions <0:4.18.0-372.9.1.rt7.166.el8
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Test your applications- Snyk ID SNYK-CENTOS8-KERNELRTKVM-1971865
- published 27 Nov 2021
- disclosed 25 Nov 2021
Introduced: 25 Nov 2021
CVE-2021-4002 Open this link in a new tabHow to fix?
Upgrade Centos:8 kernel-rt-kvm to version 0:4.18.0-372.9.1.rt7.166.el8 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by Centos.
See How to fix? for Centos:8 relevant fixed versions and status.
A memory leak flaw in the Linux kernel's hugetlbfs memory usage was found in the way the user maps some regions of memory twice using shmget() which are aligned to PUD alignment with the fault of some of the memory pages. A local user could use this flaw to get unauthorized access to some data.
References
- https://access.redhat.com/security/cve/CVE-2021-4002
- https://access.redhat.com/errata/RHSA-2022:1975
- https://bugzilla.redhat.com/show_bug.cgi?id=2025726
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=13e4ad2ce8df6e058ef482a31fdd81c725b0f7ea
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4a118f2eead1d6c49e00765de89878288d4b890
- https://lists.debian.org/debian-lts-announce/2022/03/msg00011.html
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
- https://www.debian.org/security/2022/dsa-5096
- https://www.openwall.com/lists/oss-security/2021/11/25/1
- https://www.oracle.com/security-alerts/cpujul2022.html