CVE-2021-22543
Improper memory handling in Linux KVM
02 Description
Improper memory handling in Linux KVM
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.66% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 51.0% of scored records. A rank, not a probability.
- NVD base score
- 8.7 (CVSS v4.0), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-05-26 10:30Z5 YR AGO
- Last updated
- 2024-09-16 23:26Z2 YR AGO
- Reserved
- 2021-01-05
- Assigning CNA
- Record state
- PUBLISHED
- Severity
- High (CVSS 8.7)
- CNA CVSS vector
- CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
- Weaknesses
- Data version
- 5.1
- Document digest
- 5d810815b560fa9beccfa3407215b3ebae7d0914fd79f2f8147d45bf7d9f836f
05 Affected products
06 References
- github.comhttps://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584
- www.openwall.com[oss-security] 20210626 Re: CVE-2021-22543 - /dev/kvm LPEhttp://www.openwall.com/lists/oss-security/2021/06/26/1
- lists.fedoraproject.orgFEDORA-2021-fe826f202ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4G5YBUVEPHZYXMKNGBZ3S6INFCTEEL4E/
- lists.fedoraproject.orgFEDORA-2021-95f2f1cfc7https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ROQIXQB7ZAWI3KSGSHR6H5RDUWZI775S/
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20210708-0002/
- lists.debian.org[debian-lts-announce] 20211015 [SECURITY] [DLA 2785-1] linux-4.19 security updatehttps://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
- lists.debian.org[debian-lts-announce] 20211216 [SECURITY] [DLA 2843-1] linux security updatehttps://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
07 Fixed in
AlmaLinux 8
- kernel-tools-libs-devel Fixed in 4.18.0-305.12.1.el8_4
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Arch Linux
- linux Fixed in 5.12.14.arch1-1
- linux-hardened Fixed in 5.12.14.hardened1-1
- linux-lts Fixed in 5.10.47-1
- linux-zen Fixed in 5.12.14.zen1-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
CloudLinux 8
- kernel-tools-libs-devel Fixed in 4.18.0-305.12.1.el8_4
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- linux Fixed in 5.10.46-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- linux Fixed in 5.10.46-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- linux Fixed in 5.10.46-2
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- linux-hwe-edge No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- linux Fixed in 4.15.0-159.167
- linux-aws Fixed in 4.15.0-1112.119
- linux-aws-5.0 No fix yet
- linux-aws-5.3 No fix yet
- linux-aws-5.4 Fixed in 5.4.0-1056.59~18.04.1
- linux-azure No fix yet
- linux-azure-4.15 Fixed in 4.15.0-1124.137
- linux-azure-5.3 No fix yet
- linux-azure-5.4 Fixed in 5.4.0-1058.60~18.04.1
- linux-azure-edge No fix yet
- linux-dell300x Fixed in 4.15.0-1028.33
- linux-gcp No fix yet
- linux-gcp-4.15 Fixed in 4.15.0-1109.123
- linux-gcp-5.3 No fix yet
- linux-gcp-5.4 Fixed in 5.4.0-1052.56~18.04.1
- linux-gcp-edge No fix yet
- linux-gke-4.15 No fix yet
- linux-gke-5.4 Fixed in 5.4.0-1052.55~18.04.1
- linux-gkeop-5.4 Fixed in 5.4.0-1023.24~18.04.1
- linux-hwe No fix yet
- linux-hwe-5.4 Fixed in 5.4.0-84.94~18.04.1
- linux-hwe-edge No fix yet
- linux-kvm Fixed in 4.15.0-1100.102
- linux-oem No fix yet
- linux-oracle Fixed in 4.15.0-1081.89
- linux-oracle-5.0 No fix yet
- linux-oracle-5.3 No fix yet
- linux-oracle-5.4 Fixed in 5.4.0-1054.58~18.04.1
- linux-raspi-5.4 Fixed in 5.4.0-1043.47~18.04.1
- linux-raspi2 Fixed in 4.15.0-1096.102
- linux-snapdragon Fixed in 4.15.0-1113.122
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- linux Fixed in 5.4.0-84.94
- linux-aws Fixed in 5.4.0-1056.59
- linux-aws-5.11 Fixed in 5.11.0-1017.18~20.04.1
- linux-aws-5.8 No fix yet
- linux-azure Fixed in 5.4.0-1058.60
- linux-azure-5.11 Fixed in 5.11.0-1015.16~20.04.1
- linux-azure-5.8 Fixed in 5.8.0-1043.46~20.04.1
- linux-bluefield Fixed in 5.4.0-1019.22
- linux-gcp Fixed in 5.4.0-1052.56
- linux-gcp-5.11 Fixed in 5.11.0-1018.20~20.04.2
- linux-gcp-5.8 No fix yet
- linux-gke Fixed in 5.4.0-1052.55
- linux-gkeop Fixed in 5.4.0-1023.24
- linux-hwe-5.11 Fixed in 5.11.0-34.36~20.04.1
- linux-hwe-5.8 No fix yet
- linux-kvm Fixed in 5.4.0-1046.48
- linux-oem-5.10 Fixed in 5.10.0-1049.51
- linux-oem-5.6 No fix yet
- linux-oracle Fixed in 5.4.0-1054.58
- linux-oracle-5.11 Fixed in 5.11.0-1017.18~20.04.1
- linux-oracle-5.8 No fix yet
- linux-raspi Fixed in 5.4.0-1043.47
- linux-raspi2 No fix yet
- linux-riscv No fix yet
- linux-riscv-5.11 Fixed in 5.11.0-1018.19~20.04.2
- linux-riscv-5.8 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- linux-azure-fde-5.19 No fix yet
- linux-intel-iot-realtime No fix yet
- linux-realtime No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- linux-raspi-realtime No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- linux-azure Fixed in 4.15.0-1124.137~14.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- linux-aws-hwe Fixed in 4.15.0-1112.119~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure Fixed in 4.15.0-1124.137~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-gcp Fixed in 4.15.0-1109.123~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-hwe Fixed in 4.15.0-159.167~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-oracle Fixed in 4.15.0-1081.89~16.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-updates 18.04 LTS
- linux-aws-fips Fixed in 4.15.0-2054.56Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 4.15.0-2036.40Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 4.15.0-1070.79Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 4.15.0-2019.21Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS-updates 20.04 LTS
- linux-aws-fips Fixed in 5.4.0-1069.73+fips2Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 5.4.0-1073.76+fips1Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 5.4.0-1033.38Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-gcp-fips Fixed in 5.4.0-1067.71~20.04.1Available with Ubuntu Pro: https://ubuntu.com/pro
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS 18.04 LTS
- linux-aws-fips No fix yet
- linux-azure-fips No fix yet
- linux-fips No fix yet
- linux-gcp-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro FIPS 20.04 LTS
- linux-aws-fips No fix yet
- linux-azure-fips No fix yet
- linux-fips No fix yet
- linux-gcp-fips No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.