CVE-2021-33656
First published: Tue Jan 05 2021(Updated: )
A flaw in the Linux Kernel console driver found. When setting font with malicious data by ioctl PIO_FONT, kernel will write memory out of bounds. To trigger the vulnerability user need to have access to console driver like if text mode being used through a generic VGA standard display. Reference: <a href="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://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git/tree/releases/5.10.127/vt-drop-old-font-ioctls.patch</a>
Credit: securities@openeuler.org securities@openeuler.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-477.10.1.rt7.274.el8_8 | 0:4.18.0-477.10.1.rt7.274.el8_8 |
| redhat/kernel | <0:4.18.0-477.10.1.el8_8 | 0:4.18.0-477.10.1.el8_8 |
| redhat/kernel | <0:4.18.0-372.70.1.el8_6 | 0:4.18.0-372.70.1.el8_6 |
| redhat/Kernel | <5.12 | 5.12 |
| Huawei Openeuler | =20.03 | |
| Huawei Openeuler | =20.03-sp1 | |
| Huawei Openeuler | =20.03-sp3 | |
| Linux Linux kernel | <5.10.127 | |
| Debian Debian Linux | =10.0 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
Remedy
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-33656 https://nvd.nist.gov/vuln/detail/CVE-2021-33656 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://bugzilla.redhat.com/show_bug.cgi?id=2108696
- https://access.redhat.com/errata/RHSA-2023:2736
- https://access.redhat.com/errata/RHSA-2023:2951
- https://access.redhat.com/errata/RHSA-2023:4789
- https://access.redhat.com/security/cve/cve-2021-33656
- 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://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel
- http://www.openwall.com/lists/oss-security/2022/07/19/3
- https://lists.debian.org/debian-lts-announce/2022/10/msg00000.html
- https://launchpad.net/bugs/cve/CVE-2021-33656
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2109148
- https://www.openeuler.org/en/security/cve/detail.html?id=CVE-2021-33656&packageName=kernel
- https://git.kernel.org/linus/ff2047fb755d4415ec3c70ac799889371151796d
- https://security-tracker.debian.org/tracker/CVE-2021-33656
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33656
- https://nvd.nist.gov/vuln/detail/CVE-2021-33656
- https://ubuntu.com/security/CVE-2021-33656
Parent vulnerabilities
(Appears in the following advisories)
- collector/redhat-cve
- agent/type
- collector/launchpad-cve
- source/Launchpad
- agent/author
- agent/first-publish-date
- agent/severity
- agent/remedy
- agent/weakness
- agent/description
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2021-33656
- agent/software-canonical-lookup
- collector/nvd-index
- agent/software-canonical-lookup-request
- collector/nvd-cve
- source/NVD
- agent/references
- collector/mitre-cve
- source/MITRE
- agent/last-modified-date
- agent/event
- agent/tags
- collector/security-tracker-debian
- source/Debian
- agent/softwarecombine
- collector/usn-cve
- source/Ubuntu
- package-manager/redhat
- vendor/huawei
- canonical/huawei openeuler
- version/huawei openeuler/20.03
- version/huawei openeuler/20.03-sp1
- version/huawei openeuler/20.03-sp3
- vendor/linux
- canonical/linux linux kernel
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/10.0
- package-manager/debian