Out-of-bounds Write Affecting kernel-rt-debug-devel package, versions <0:4.18.0-477.10.1.rt7.274.el8_8
Threat Intelligence
EPSS
0.08% (35th
percentile)
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Test your applications- Snyk ID SNYK-CENTOS8-KERNELRTDEBUGDEVEL-2957680
- published 21 Jul 2022
- disclosed 5 Jan 2021
Introduced: 5 Jan 2021
CVE-2021-33656 Open this link in a new tabHow to fix?
Upgrade Centos:8 kernel-rt-debug-devel to version 0:4.18.0-477.10.1.rt7.274.el8_8 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-devel package and not the kernel-rt-debug-devel package as distributed by Centos.
See How to fix? for Centos:8 relevant fixed versions and status.
When setting font with malicous data by ioctl cmd PIO_FONT,kernel will write memory out of bounds.
References
- https://access.redhat.com/security/cve/CVE-2021-33656
- http://www.openwall.com/lists/oss-security/2022/07/19/3
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
- https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel
CVSS Scores
version 3.1