CVE-2021-20317
First published: Fri Sep 17 2021(Updated: )
A flaw was found in the Linux kernel. A corrupted timer tree caused the task wakeup to be missing in the timerqueue_add function in lib/timerqueue.c. This flaw allows a local attacker with special user privileges to cause a denial of service, slowing and eventually stopping the system while running OSP.
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <0:4.18.0-348.2.1.rt7.132.el8_5 | 0:4.18.0-348.2.1.rt7.132.el8_5 |
| redhat/kernel | <0:4.18.0-348.2.1.el8_5 | 0:4.18.0-348.2.1.el8_5 |
| redhat/kernel-rt | <0:4.18.0-193.70.1.rt13.120.el8_2 | 0:4.18.0-193.70.1.rt13.120.el8_2 |
| redhat/kernel | <0:4.18.0-193.70.1.el8_2 | 0:4.18.0-193.70.1.el8_2 |
| redhat/kernel-rt | <0:4.18.0-305.28.1.rt7.100.el8_4 | 0:4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel | <0:4.18.0-305.28.1.el8_4 | 0:4.18.0-305.28.1.el8_4 |
| Linux Linux kernel | <5.4 | |
| Linux Linux kernel | =5.4 | |
| Debian Debian Linux | =9.0 | |
| Debian Debian Linux | =10.0 | |
| redhat/Linux Kernel | <5.4 | 5.4 |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
Remedy
In order to mitigate this issue, it is possible to prevent the affected code by loading the kvm module with "pi_inject_timer=0" parameter. ~~~ rmmod kvm_intel kvm modprobe kvm pi_inject_timer=0 modprobe kvm_intel ~~~
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-20317 https://nvd.nist.gov/vuln/detail/CVE-2021-20317 https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=511885d7061eda3eb1faf3f57dcc936ff75863f1
- https://bugzilla.redhat.com/show_bug.cgi?id=2005258
- https://access.redhat.com/errata/RHSA-2021:4646
- https://access.redhat.com/errata/RHSA-2021:4647
- https://access.redhat.com/errata/RHSA-2021:4875
- https://access.redhat.com/errata/RHSA-2021:4871
- https://access.redhat.com/errata/RHSA-2021:4648
- https://access.redhat.com/errata/RHSA-2021:4650
- https://access.redhat.com/security/cve/cve-2021-20317
- https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
- https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?id=511885d7061eda3eb1faf3f57dcc936ff75863f1
- https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
- https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
- https://www.debian.org/security/2022/dsa-5096
- https://launchpad.net/bugs/cve/CVE-2021-20317
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2005258#c10
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2005258#c11
- https://git.kernel.org/linus/511885d7061eda3eb1faf3f57dcc936ff75863f1
- https://security-tracker.debian.org/tracker/CVE-2021-20317
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-20317
- https://nvd.nist.gov/vuln/detail/CVE-2021-20317
- https://ubuntu.com/security/CVE-2021-20317
Parent vulnerabilities
(Appears in the following advisories)
- collector/redhat-cve
- collector/nvd-index
- agent/type
- agent/first-publish-date
- collector/launchpad-cve
- source/Launchpad
- agent/author
- agent/weakness
- agent/severity
- agent/remedy
- agent/description
- collector/nvd-cve
- source/NVD
- agent/software-canonical-lookup
- collector/redhat-bugzilla
- source/Red Hat
- alias/CVE-2021-20317
- 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/linux
- canonical/linux linux kernel
- version/linux linux kernel/5.4
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- version/debian debian linux/10.0
- package-manager/debian