CVE-2020-4788
IBM Power9 (AIX 7.1, 7.2, and VIOS 3.1) processors could allow a local user to obtain sensitive information from the data in the L1 cache under extenuating circumstances. IBM X-Force ID: 189296.
02 Description
IBM Power9 (AIX 7.1, 7.2, and VIOS 3.1) processors could allow a local user to obtain sensitive information from the data in the L1 cache under extenuating circumstances. IBM X-Force ID: 189296.
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
- 0.39% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 33.0% of scored records. A rank, not a probability.
- NVD base score
- 4.7 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. 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
- 2020-11-20 03:45Z5 YR AGO
- Last updated
- 2024-09-16 19:05Z2 YR AGO
- Reserved
- 2019-12-30
- Assigning CNA
- ibm
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.1)
- CNA CVSS vector
- CVSS:3.0/PR:N/C:H/AV:L/AC:H/S:U/A:N/I:N/UI:N/E:U/RC:C/RL:O
- Weaknesses
- CWE-200Exposure of Sensitive Information to an Unauthorized ActorClass
- Data version
- 5.1
- Document digest
- 9e99307eaa978a7bb7503328a57b2eb0449b2c1175ed2ee0b582f645966e9e79
05 Affected products
06 References
- www.ibm.comhttps://www.ibm.com/support/pages/node/6370729
- exchange.xforce.ibmcloud.comibm-i-cve20204788-info-disc (189296)https://exchange.xforce.ibmcloud.com/vulnerabilities/189296
- www.openwall.com[oss-security] 20201120 CVE-2020-4788: Speculation on incompletely validated data on IBM Power9http://www.openwall.com/lists/oss-security/2020/11/20/3
- www.openwall.com[oss-security] 20201123 Re: CVE-2020-4788: Speculation on incompletely validated data on IBM Power9http://www.openwall.com/lists/oss-security/2020/11/23/1
- lists.fedoraproject.orgFEDORA-2020-4700a73bd5https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZF4OGZPKTAJJXWHPIFP3LHEWWEMR5LPT/
- lists.fedoraproject.orgFEDORA-2020-8c15928d23https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TITJQPYDWZ4NB2ONJWUXW75KSQIPF35T/
- www.oracle.comhttps://www.oracle.com/security-alerts/cpujul2022.html
07 Fixed in
AlmaLinux 8
- bpftool Fixed in 4.18.0-372.9.1.el8
- kernel Fixed in 4.18.0-372.9.1.el8
- kernel-abi-stablelists Fixed in 4.18.0-372.9.1.el8
- kernel-core Fixed in 4.18.0-372.9.1.el8
- kernel-cross-headers Fixed in 4.18.0-372.9.1.el8
- kernel-debug Fixed in 4.18.0-372.9.1.el8
- kernel-debug-core Fixed in 4.18.0-372.9.1.el8
- kernel-debug-devel Fixed in 4.18.0-372.9.1.el8
- kernel-debug-modules Fixed in 4.18.0-372.9.1.el8
- kernel-debug-modules-extra Fixed in 4.18.0-372.9.1.el8
- kernel-devel Fixed in 4.18.0-372.9.1.el8
- kernel-doc Fixed in 4.18.0-372.9.1.el8
- kernel-headers Fixed in 4.18.0-372.9.1.el8
- kernel-modules Fixed in 4.18.0-372.9.1.el8
- kernel-modules-extra Fixed in 4.18.0-372.9.1.el8
- kernel-tools Fixed in 4.18.0-372.9.1.el8
- kernel-tools-libs Fixed in 4.18.0-372.9.1.el8
- kernel-tools-libs-devel Fixed in 4.18.0-372.9.1.el8
- perf Fixed in 4.18.0-372.9.1.el8
- python3-perf Fixed in 4.18.0-372.9.1.el8
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- bpftool Fixed in 4.18.0-372.9.1.el8
- kernel Fixed in 4.18.0-372.9.1.el8
- kernel-abi-stablelists Fixed in 4.18.0-372.9.1.el8
- kernel-core Fixed in 4.18.0-372.9.1.el8
- kernel-cross-headers Fixed in 4.18.0-372.9.1.el8
- kernel-debug Fixed in 4.18.0-372.9.1.el8
- kernel-debug-core Fixed in 4.18.0-372.9.1.el8
- kernel-debug-devel Fixed in 4.18.0-372.9.1.el8
- kernel-debug-modules Fixed in 4.18.0-372.9.1.el8
- kernel-debug-modules-extra Fixed in 4.18.0-372.9.1.el8
- kernel-devel Fixed in 4.18.0-372.9.1.el8
- kernel-doc Fixed in 4.18.0-372.9.1.el8
- kernel-headers Fixed in 4.18.0-372.9.1.el8
- kernel-modules Fixed in 4.18.0-372.9.1.el8
- kernel-modules-extra Fixed in 4.18.0-372.9.1.el8
- kernel-tools Fixed in 4.18.0-372.9.1.el8
- kernel-tools-libs Fixed in 4.18.0-372.9.1.el8
- kernel-tools-libs-devel Fixed in 4.18.0-372.9.1.el8
- perf Fixed in 4.18.0-372.9.1.el8
- python3-perf Fixed in 4.18.0-372.9.1.el8
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 5.9.11-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- linux Fixed in 5.9.11-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- linux Fixed in 5.9.11-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- linux Fixed in 4.4.0-197.229
- linux-aws Fixed in 4.4.0-1119.133
- linux-hwe Fixed in 4.15.0-126.129~16.04.1
- linux-hwe-edge No fix yet
- linux-kvm Fixed in 4.4.0-1085.94
- linux-raspi2 Fixed in 4.4.0-1143.153
- linux-snapdragon Fixed in 4.4.0-1147.157
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 4.15.0-126.129
- linux-aws-5.0 No fix yet
- linux-aws-5.3 No fix yet
- linux-aws-5.4 Fixed in 5.4.0-1032.33~18.04.1
- linux-azure No fix yet
- linux-azure-5.3 No fix yet
- linux-azure-5.4 Fixed in 5.4.0-1034.35~18.04.1
- linux-azure-edge No fix yet
- linux-dell300x Fixed in 4.15.0-1009.13
- linux-gcp No fix yet
- linux-gcp-5.3 No fix yet
- linux-gcp-5.4 Fixed in 5.4.0-1032.34~18.04.1
- linux-gcp-edge No fix yet
- linux-gke-5.4 Fixed in 5.4.0-1032.34~18.04.1
- linux-gkeop-5.4 Fixed in 5.4.0-1007.8~18.04.1
- linux-hwe-5.4 Fixed in 5.4.0-56.62~18.04.1
- linux-hwe-edge No fix yet
- linux-oracle-5.0 No fix yet
- linux-oracle-5.3 No fix yet
- linux-oracle-5.4 Fixed in 5.4.0-1033.35
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 5.4.0-56.62
- linux-aws Fixed in 5.4.0-1032.33
- linux-azure Fixed in 5.4.0-1034.35
- linux-azure-fde No fix yet
- linux-gcp Fixed in 5.4.0-1032.34
- linux-gke No fix yet
- linux-hwe-5.8 Fixed in 5.8.0-31.33~20.04.1
- linux-kvm Fixed in 5.4.0-1028.29
- linux-oracle Fixed in 5.4.0-1032.34
- linux-raspi2 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-intel-iot-realtime No fix yet
- linux-realtime No fix yet
- linux-riscv 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 No fix yet
- linux-aws Fixed in 4.4.0-1083.87Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-azure Fixed in 4.15.0-1102.113~14.04.1Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro
- linux-lts-xenial Fixed in 4.4.0-197.229~14.04.1Available 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 20.04 LTS
- linux-azure-fde-5.15 Fixed in 5.15.0-1114.123~20.04.1Available 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 16.04 LTS
- linux-fips Fixed in 4.4.0-1051.57Available 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 18.04 LTS
- linux-aws-fips Fixed in 4.15.0-2033.34Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-azure-fips Fixed in 4.15.0-2015.17Available with Ubuntu Pro: https://ubuntu.com/pro
- linux-fips Fixed in 4.15.0-1048.55Available 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-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 16.04 LTS
- linux-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 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-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.