CVE-2021-22543

Description

An issue was discovered in Linux: KVM through Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks and can lead to pages being freed while still accessible by the VMM and guest. This allows users with the ability to start and control a VM to read/write random pages of memory and can result in local privilege escalation.

CVSS Metrics

• v4.0•HIGH•Score: 8.7CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
• v4.0•HIGH•Score: 8.7CVSS: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
• v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
• v3.1•HIGH•Score: 7CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
• v2.0•MEDIUM•Score: 4.6AV:L/AC:L/Au:N/C:P/I:P/A:P

EPSS Trends

Current EPSS score: 0.66%• Percentile: 50%

Techniques & Countermeasures

• CWE-119•Improper Restriction of Operations within the Bounds of a Memory Buffer

  The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.

Affected Systems

• debian•linux

  < 5.10.46-2 | < 5.10.46-2 | < 5.10.46-2 | < 5.10.46-2

• ubuntu•linux

  < 4.15.0-159.167 | < 5.4.0-84.94

• ubuntu•linux-aws

  < 4.15.0-1112.119 | < 5.4.0-1056.59

• ubuntu•linux-aws-5.0

  all

• ubuntu•linux-aws-5.11

  < 5.11.0-1017.18~20.04.1

• ubuntu•linux-aws-5.3

  all

• ubuntu•linux-aws-5.4

  < 5.4.0-1056.59~18.04.1

• ubuntu•linux-aws-5.8

  all

• ubuntu•linux-aws-fips

  < 4.15.0-2054.56 | all | < 5.4.0-1069.73+fips2

• ubuntu•linux-aws-hwe

  < 4.15.0-1112.119~16.04.1

• ubuntu•linux-azure

  < 4.15.0-1124.137~14.04.1 | < 4.15.0-1124.137~16.04.1 | all | < 5.4.0-1058.60

• ubuntu•linux-azure-4.15

  < 4.15.0-1124.137

• ubuntu•linux-azure-5.11

  < 5.11.0-1015.16~20.04.1

• ubuntu•linux-azure-5.3

  all

• ubuntu•linux-azure-5.4

  < 5.4.0-1058.60~18.04.1

• ubuntu•linux-azure-5.8

  < 5.8.0-1043.46~20.04.1

• ubuntu•linux-azure-edge

  all

• ubuntu•linux-azure-fde-5.19

  all

• ubuntu•linux-azure-fips

  < 4.15.0-2036.40 | all | < 5.4.0-1073.76+fips1

• ubuntu•linux-bluefield

  all | < 5.4.0-1019.22

• ubuntu•linux-dell300x

  < 4.15.0-1028.33

• ubuntu•linux-fips

  < 4.15.0-1070.79 | all | < 5.4.0-1033.38

• ubuntu•linux-gcp

  < 4.15.0-1109.123~16.04.1 | all | < 5.4.0-1052.56

• ubuntu•linux-gcp-4.15

  < 4.15.0-1109.123

• ubuntu•linux-gcp-5.11

  < 5.11.0-1018.20~20.04.2

• ubuntu•linux-gcp-5.3

  all

• ubuntu•linux-gcp-5.4

  < 5.4.0-1052.56~18.04.1

• ubuntu•linux-gcp-5.8

  all

• ubuntu•linux-gcp-edge

  all

• ubuntu•linux-gcp-fips

  < 4.15.0-2019.21 | all | < 5.4.0-1067.71~20.04.1

• ubuntu•linux-gke

  < 5.4.0-1052.55

• ubuntu•linux-gke-4.15

  all

• ubuntu•linux-gke-5.4

  < 5.4.0-1052.55~18.04.1

• ubuntu•linux-gkeop

  < 5.4.0-1023.24

• ubuntu•linux-gkeop-5.4

  < 5.4.0-1023.24~18.04.1

• ubuntu•linux-hwe

  < 4.15.0-159.167~16.04.1 | all

• ubuntu•linux-hwe-5.11

  < 5.11.0-34.36~20.04.1

• ubuntu•linux-hwe-5.4

  < 5.4.0-84.94~18.04.1

• ubuntu•linux-hwe-5.8

  all

• ubuntu•linux-hwe-edge

  all | all

• ubuntu•linux-intel-iot-realtime

  all

• ubuntu•linux-kvm

  < 4.15.0-1100.102 | < 5.4.0-1046.48

• ubuntu•linux-oem

  all

• ubuntu•linux-oem-5.10

  < 5.10.0-1049.51

• ubuntu•linux-oem-5.6

  all

• ubuntu•linux-oracle

  < 4.15.0-1081.89~16.04.1 | < 4.15.0-1081.89 | < 5.4.0-1054.58

• ubuntu•linux-oracle-5.0

  all

• ubuntu•linux-oracle-5.11

  < 5.11.0-1017.18~20.04.1

• ubuntu•linux-oracle-5.3

  all

• ubuntu•linux-oracle-5.4

  < 5.4.0-1054.58~18.04.1

Showing first 50 affected entries in server-rendered view.

References (32)

• https://github.com/google/security-research/security/advisories/GHSA-7wq5-phmq-m584
• http://www.openwall.com/lists/oss-security/2021/06/26/1
• 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://security.netapp.com/advisory/ntap-20210708-0002/
• https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
• https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
• https://access.redhat.com/errata/RHSA-2021:3943
• https://access.redhat.com/security/updates/classification/#moderate
• https://bugzilla.redhat.com/show_bug.cgi?id=1965461
• https://bugzilla.redhat.com/show_bug.cgi?id=2010171
• https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_3943.json
• https://access.redhat.com/security/cve/CVE-2021-22543
• https://www.cve.org/CVERecord?id=CVE-2021-22543
• https://nvd.nist.gov/vuln/detail/CVE-2021-22543
• https://access.redhat.com/errata/RHSA-2022:5640
• https://access.redhat.com/security/updates/classification/#important
• https://security.access.redhat.com/data/csaf/v2/advisories/2022/rhsa-2022_5640.json
• https://ubuntu.com/security/CVE-2021-22543
• https://www.openwall.com/lists/oss-security/2021/05/26/3
• https://www.openwall.com/lists/oss-security/2021/05/26/4
• https://www.openwall.com/lists/oss-security/2021/05/26/5
• https://github.com/torvalds/linux/commit/f8be156be163a052a067306417cd0ff679068c97
• https://ubuntu.com/security/notices/USN-5070-1
• https://ubuntu.com/security/notices/USN-5071-1
• https://ubuntu.com/security/notices/USN-5071-2
• https://ubuntu.com/security/notices/USN-5071-3
• https://ubuntu.com/security/notices/USN-5094-1
• https://ubuntu.com/security/notices/USN-5094-2
• https://ubuntu.com/security/notices/USN-5106-1
• https://ubuntu.com/security/notices/USN-5120-1
• https://security-tracker.debian.org/tracker/CVE-2021-22543