CVE-2021-22543: Improper memory handling in Linux KVM
First published: Tue May 18 2021(Updated: )
A flaw was found in the Linux kernel’s KVM implementation, where improper handing of the VM_IO|VM_PFNMAP VMAs in KVM bypasses RO checks and leads to pages being freed while still accessible by the VMM and guest. This flaw allows users who can start and control a VM to read/write random pages of memory, resulting in local privilege escalation. The highest threat from this vulnerability is to confidentiality, integrity, and system availability.
Credit: cve-coordination@google.com cve-coordination@google.com cve-coordination@google.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <0:2.6.32-754.48.1.el6 | 0:2.6.32-754.48.1.el6 |
| redhat/kernel-rt | <0:3.10.0-1160.45.1.rt56.1185.el7 | 0:3.10.0-1160.45.1.rt56.1185.el7 |
| redhat/kernel | <0:3.10.0-1160.45.1.el7 | 0:3.10.0-1160.45.1.el7 |
| redhat/kernel | <0:3.10.0-327.101.1.el7 | 0:3.10.0-327.101.1.el7 |
| redhat/kernel | <0:3.10.0-514.93.1.el7 | 0:3.10.0-514.93.1.el7 |
| redhat/kernel | <0:3.10.0-693.94.1.el7 | 0:3.10.0-693.94.1.el7 |
| redhat/kernel | <0:3.10.0-957.84.1.el7 | 0:3.10.0-957.84.1.el7 |
| redhat/kernel | <0:3.10.0-1062.59.1.el7 | 0:3.10.0-1062.59.1.el7 |
| redhat/kernel-rt | <0:4.18.0-305.12.1.rt7.84.el8_4 | 0:4.18.0-305.12.1.rt7.84.el8_4 |
| redhat/kernel | <0:4.18.0-305.12.1.el8_4 | 0:4.18.0-305.12.1.el8_4 |
| redhat/kernel | <0:4.18.0-147.52.1.el8_1 | 0:4.18.0-147.52.1.el8_1 |
| redhat/kernel-rt | <0:4.18.0-193.64.1.rt13.115.el8_2 | 0:4.18.0-193.64.1.rt13.115.el8_2 |
| redhat/kernel | <0:4.18.0-193.64.1.el8_2 | 0:4.18.0-193.64.1.el8_2 |
| redhat/redhat-virtualization-host | <0:4.3.19-20211013.0.el7_9 | 0:4.3.19-20211013.0.el7_9 |
| redhat/redhat-virtualization-host | <0:4.4.7-20210804.0.el8_4 | 0:4.4.7-20210804.0.el8_4 |
| Linux Linux kernel | =2021-05-18 | |
| Fedoraproject Fedora | =33 | |
| Fedoraproject Fedora | =34 | |
| Debian Debian Linux | =9.0 | |
| Netapp Baseboard Management Controller H410c Firmware | ||
| Netapp Baseboard Management Controller H410c | ||
| Netapp Baseboard Management Controller H300s Firmware | ||
| Netapp Baseboard Management Controller H300s | ||
| Netapp Baseboard Management Controller H500s Firmware | ||
| Netapp Baseboard Management Controller H500s | ||
| Netapp Baseboard Management Controller H700s Firmware | ||
| Netapp Baseboard Management Controller H700s | ||
| Netapp Baseboard Management Controller H300e Firmware | ||
| Netapp Baseboard Management Controller H300e | ||
| Netapp Baseboard Management Controller H500e Firmware | ||
| Netapp Baseboard Management Controller H500e | ||
| Netapp Baseboard Management Controller H700e Firmware | ||
| Netapp Baseboard Management Controller H700e | ||
| Netapp Baseboard Management Controller H410s Firmware | ||
| Netapp Baseboard Management Controller H410s | ||
| Netapp Cloud Backup | ||
| Netapp Solidfire Baseboard Management Controller Firmware | ||
| redhat/kernel | <5.13 | 5.13 |
| All of | ||
| Netapp H410c Firmware | ||
| Netapp H410c | ||
| All of | ||
| Netapp H300s Firmware | ||
| Netapp H300s | ||
| All of | ||
| Netapp H500s Firmware | ||
| Netapp H500s | ||
| All of | ||
| Netapp H700s Firmware | ||
| Netapp H700s | ||
| All of | ||
| Netapp H300e Firmware | ||
| Netapp H300e | ||
| All of | ||
| Netapp H500e Firmware | ||
| Netapp H500e | ||
| All of | ||
| Netapp H700e Firmware | ||
| Netapp H700e | ||
| All of | ||
| Netapp H410s Firmware | ||
| Netapp H410s | ||
| IBM Cloud Pak for Security (CP4S) | <=1.7.2.0 | |
| IBM Cloud Pak for Security (CP4S) | <=1.7.1.0 | |
| IBM Cloud Pak for Security (CP4S) | <=1.7.0.0 | |
| 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
Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update as soon as possible.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2021-22543 https://nvd.nist.gov/vuln/detail/CVE-2021-22543 https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584
- https://bugzilla.redhat.com/show_bug.cgi?id=1965461
- https://access.redhat.com/errata/RHSA-2022:5640
- https://access.redhat.com/errata/RHSA-2021:3802
- https://access.redhat.com/errata/RHSA-2021:3768
- https://access.redhat.com/errata/RHSA-2021:3801
- https://access.redhat.com/errata/RHSA-2021:3767
- https://access.redhat.com/errata/RHSA-2021:3766
- https://access.redhat.com/errata/RHSA-2021:3725
- https://access.redhat.com/errata/RHSA-2021:3812
- https://access.redhat.com/errata/RHSA-2021:3814
- https://access.redhat.com/errata/RHSA-2021:3987
- https://access.redhat.com/errata/RHSA-2021:4000
- https://access.redhat.com/errata/RHSA-2021:3088
- https://access.redhat.com/errata/RHSA-2021:3044
- https://access.redhat.com/errata/RHSA-2021:3057
- https://access.redhat.com/errata/RHSA-2021:3173
- https://access.redhat.com/errata/RHSA-2021:3181
- https://access.redhat.com/errata/RHSA-2021:3375
- https://access.redhat.com/errata/RHSA-2021:3363
- https://access.redhat.com/errata/RHSA-2021:3380
- https://access.redhat.com/errata/RHSA-2021:3943
- https://access.redhat.com/errata/RHSA-2021:3235
- https://access.redhat.com/security/cve/cve-2021-22543
- http://www.openwall.com/lists/oss-security/2021/06/26/1
- https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584
- https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
- https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4G5YBUVEPHZYXMKNGBZ3S6INFCTEEL4E/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ROQIXQB7ZAWI3KSGSHR6H5RDUWZI775S/
- https://security.netapp.com/advisory/ntap-20210708-0002/
- http://www.openwall.com/lists/oss-security/2021/05/26/3
- http://www.openwall.com/lists/oss-security/2021/05/26/4
- http://www.openwall.com/lists/oss-security/2021/05/26/5
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1965462
- https://github.com/torvalds/linux/commit/bd2fae8d
- https://github.com/torvalds/linux/commit/a9545779
- https://seclists.org/oss-sec/2021/q2/169
- https://github.com/torvalds/linux/commit/f8be156be163a052a067306417cd0ff679068c97
- https://access.redhat.com/errata/RHSA-2021:81932
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4G5YBUVEPHZYXMKNGBZ3S6INFCTEEL4E/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ROQIXQB7ZAWI3KSGSHR6H5RDUWZI775S/
- https://launchpad.net/bugs/cve/CVE-2021-22543
- https://exchange.xforce.ibmcloud.com/vulnerabilities/202561
- https://www.ibm.com/support/pages/node/6493729 (Advisory)
- https://www.openwall.com/lists/oss-security/2021/05/26/3
- https://git.kernel.org/linus/f8be156be163a052a067306417cd0ff679068c97
- https://security-tracker.debian.org/tracker/CVE-2021-22543
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22543
- https://nvd.nist.gov/vuln/detail/CVE-2021-22543
- https://ubuntu.com/security/CVE-2021-22543
Parent vulnerabilities
(Appears in the following advisories)
- RHSA-2022:5640
- RHSA-2021:3802
- RHSA-2021:3768
- RHSA-2021:3801
- RHSA-2021:3767
- RHSA-2021:3766
- RHSA-2021:3725
- RHSA-2021:3812
- RHSA-2021:3814
- RHSA-2021:3987
- RHSA-2021:4000
- RHSA-2021:3088
- RHSA-2021:3044
- RHSA-2021:3057
- RHSA-2021:3173
- RHSA-2021:3181
- RHSA-2021:3375
- RHSA-2021:3363
- RHSA-2021:3380
- RHSA-2021:3943
- RHSA-2021:3235
- IBM-6493729
- collector/redhat-cve
- collector/nvd-index
- agent/type
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- version/fedoraproject fedora/34
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- vendor/netapp
- canonical/netapp baseboard management controller h410c firmware
- canonical/netapp baseboard management controller h410c
- canonical/netapp baseboard management controller h300s firmware
- canonical/netapp baseboard management controller h300s
- canonical/netapp baseboard management controller h500s firmware
- canonical/netapp baseboard management controller h500s
- canonical/netapp baseboard management controller h700s firmware
- canonical/netapp baseboard management controller h700s
- canonical/netapp baseboard management controller h300e firmware
- canonical/netapp baseboard management controller h300e
- canonical/netapp baseboard management controller h500e firmware
- canonical/netapp baseboard management controller h500e
- canonical/netapp baseboard management controller h700e firmware
- canonical/netapp baseboard management controller h700e
- canonical/netapp baseboard management controller h410s firmware
- canonical/netapp baseboard management controller h410s
- canonical/netapp cloud backup
- canonical/netapp solidfire baseboard management controller firmware
- canonical/netapp h410c firmware
- canonical/netapp h410c
- canonical/netapp h300s firmware
- canonical/netapp h300s
- canonical/netapp h500s firmware
- canonical/netapp h500s
- canonical/netapp h700s firmware
- canonical/netapp h700s
- canonical/netapp h300e firmware
- canonical/netapp h300e
- canonical/netapp h500e firmware
- canonical/netapp h500e
- canonical/netapp h700e firmware
- canonical/netapp h700e
- canonical/netapp h410s firmware
- canonical/netapp h410s
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