CVE-2020-28974: debian debian_linux Out-of-bounds Read

Modified

AliasesUBUNTU-CVE-2020-28974USN-4683-1DEBIAN-CVE-2020-28974

Published 20-11-2020Last modified 04-08-2024

Vulnerability summary

CVE-2020-28974 is a medium (CVSS 6.1) Out-of-bounds Read vulnerability in debian debian_linux. EPSS estimates a 0.52% chance of exploitation in the next 30 days, higher than 44% of scored vulnerabilities. 1 public exploit is recorded.

Priority

Routine

Not severe (CVSS 5, physical access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

6.1/10

010

Medium · v2.0 (NVD)

EPSS score

0.52%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits1reference

Timeline

20-11-2020
PublishedVulnerability first disclosed.
04-08-2024
Last modifiedVulnerability information updated.

Description

A slab-out-of-bounds read in fbcon in the Linux kernel before 5.9.7 could be used by local attackers to read privileged information or potentially crash the kernel, aka CID-3c4e0dff2095. This occurs because KD_FONT_OP_COPY in drivers/tty/vt/vt.c can be used for manipulations such as font height.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.15.0v2.06.1

EPSS trend

Probability

0.52%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.52% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

1 found

referenceUnverified
Exploit Reference (seclists.org)
Maturity: unknown

Weaknesses

CWE · root cause

CWE-125Out-of-bounds ReadThe product reads data past the end, or before the beginning, of the intended buffer.

Affected systems

Version check

Known conditions: physical access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu46 products

linuxAll versions (No fix recorded) | < 4.4.0-198.230 | < 4.15.0-129.132 | < 5.4.0-59.65
linux-aws< 4.4.0-1083.87 | < 4.4.0-1119.133 | < 4.15.0-1091.96 | < 5.4.0-1034.35
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1034.35~18.04.1

linux-aws-fips< 4.15.0-2034.35 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1091.96~16.04.1
linux-azure< 4.15.0-1103.114~14.04.1 | < 4.15.0-1103.114~16.04.1 | All versions (No fix recorded) | < 5.4.0-1035.36
linux-azure-4.15< 4.15.0-1103.114
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1035.36~18.04.1
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fde-5.15< 5.15.0-1114.123~20.04.1
linux-azure-fips< 4.15.0-2016.18 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-dell300x< 4.15.0-1010.14
linux-fips< 4.4.0-1052.58 | All versions (No fix recorded) | < 4.15.0-1049.56
linux-gcp< 4.15.0-1091.104~16.04.1 | All versions (No fix recorded) | < 5.4.0-1033.35
linux-gcp-4.15< 4.15.0-1091.104
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1033.35~18.04.1
linux-gcp-edgeAll versions (No fix recorded)
linux-gcp-fipsAll versions (No fix recorded) | < 5.4.0-1067.71~20.04.1
linux-gke-4.15< 4.15.0-1077.82
linux-gke-5.4< 5.4.0-1033.35~18.04.1
linux-gkeop-5.4< 5.4.0-1008.9~18.04.1
linux-hwe< 4.15.0-129.132~16.04.1 | All versions (No fix recorded)
linux-hwe-5.4< 5.4.0-59.65~18.04.1
linux-hwe-5.8< 5.8.0-44.50~20.04.1
linux-hwe-edgeAll versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 4.4.0-1085.94 | < 4.15.0-1082.84 | < 5.4.0-1031.32
linux-lts-xenial< 4.4.0-198.230~14.04.1
linux-oemAll versions (No fix recorded)
linux-oem-5.6< 5.6.0-1039.43
linux-oracle< 4.15.0-1062.68~16.04.1 | < 4.15.0-1062.68 | < 5.4.0-1034.36
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1034.36~18.04.1
linux-raspi< 5.4.0-1026.29
linux-raspi-5.4< 5.4.0-1026.29~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.4.0-1143.153 | < 4.15.0-1077.82 | All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscv< 5.4.0-40.45
linux-riscv-5.8< 5.8.0-17.19~20.04.1
linux-snapdragon< 4.4.0-1147.157 | < 4.15.0-1094.103