CVE-2020-27820: fedoraproject fedora Use After Free

Modified

AliasesUBUNTU-CVE-2020-27820DEBIAN-CVE-2020-27820

Published 02-11-2021Last modified 04-08-2024

Vulnerability summary

CVE-2020-27820 is a medium (CVSS 4.7) Use After Free vulnerability in fedoraproject fedora. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 43% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 4.7, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

4.7/10

010

Medium · v3.1 (NVD)

EPSS score

0.50%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

02-11-2021
PublishedVulnerability first disclosed.
04-08-2024
Last modifiedVulnerability information updated.

Description

A vulnerability was found in Linux kernel, where a use-after-frees in nouveau's postclose() handler could happen if removing device (that is not common to remove video card physically without power-off, but same happens if "unbind" the driver).

CVSS metrics

4 scores · 3 sources · 2 versions

v3.14.7v2.04.7

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.50% 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

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu69 products

linuxAll versions (No fix recorded) | < 4.4.0-224.257 | < 5.4.0-110.124
linux-aws< 4.4.0-1104.109 | < 4.4.0-1140.154 | All versions (No fix recorded) | < 5.4.0-1073.78
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11< 5.11.0-1028.31~20.04.1
linux-aws-5.13< 5.13.0-1012.13~20.04.1

linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1075.80~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-fipsAll versions (No fix recorded) | < 5.4.0-1073.78+fips1
linux-aws-hweAll versions (No fix recorded)
linux-azureAll versions (No fix recorded) | < 5.4.0-1078.81
linux-azure-4.15All versions (No fix recorded)
linux-azure-5.11< 5.11.0-1028.31~20.04.2
linux-azure-5.13< 5.13.0-1013.15~20.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1078.81~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fde-5.15< 5.15.0-1114.123~20.04.1
linux-azure-fipsAll versions (No fix recorded) | < 5.4.0-1078.81+fips1
linux-bluefield< 5.4.0-1040.44
linux-fips< 4.4.0-1074.80 | All versions (No fix recorded) | < 5.4.0-1049.55
linux-gcpAll versions (No fix recorded) | < 5.4.0-1073.78
linux-gcp-4.15All versions (No fix recorded)
linux-gcp-5.11< 5.11.0-1029.33~20.04.3
linux-gcp-5.13< 5.13.0-1013.16~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1073.78~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-edgeAll versions (No fix recorded)
linux-gcp-fipsAll versions (No fix recorded) | < 5.4.0-1073.78+fips1
linux-gke< 5.4.0-1071.76
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1071.76~18.04.3
linux-gkeop< 5.4.0-1040.41
linux-gkeop-5.4< 5.4.0-1040.41~18.04.1
linux-hweAll versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13< 5.13.0-28.31~20.04.1
linux-hwe-5.4< 5.4.0-110.124~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1021.23
linux-ibm-5.4< 5.4.0-1021.23~18.04.1
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-iot< 5.4.0-1004.6
linux-kvm< 4.4.0-1105.114 | All versions (No fix recorded) | < 5.4.0-1063.66
linux-lts-xenial< 4.4.0-224.257~14.04.1
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1053.55
linux-oem-5.13< 5.13.0-1029.36
linux-oem-5.14< 5.14.0-1022.24
linux-oem-5.6All versions (No fix recorded)
linux-oracleAll versions (No fix recorded) | < 5.4.0-1071.77
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11< 5.11.0-1028.31~20.04.1
linux-oracle-5.13< 5.13.0-1016.20~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1071.77~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1060.68
linux-raspi-5.4< 5.4.0-1060.68~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.8All versions (No fix recorded)

Show all 69

Oracle3 products

Debian1 product

linux< 5.15.5-1

Fedoraproject1 product

fedoraEOL33

Linux1 product

linux_kernel> 2.6.12, < 5.4.162 | > 5.5, < 5.10.82 | > 5.11, < 5.15.5 | 2.6.12 | 2.6.12:rc2 | 2.6.12:rc3 | 2.6.12:rc4 | 2.6.12:rc5 | 2.6.12:rc6

5 vendors · 75 products

References

13 links

bugzilla.redhat.com/show_bug.cgi?id=1901726X Refsource MISCIssue TrackingPatchThird Party Advisory
lore.kernel.org/dri-devel/20201103194912.184413-2-jcline%40redhat.com/X Refsource MISCMailing ListVendor Advisory
lore.kernel.org/dri-devel/20201103194912.184413-3-jcline%40redhat.com/X Refsource MISCMailing ListVendor Advisory
lore.kernel.org/dri-devel/20201103194912.184413-4-jcline%40redhat.com/X Refsource MISCMailing ListVendor Advisory
www.oracle.com/security-alerts/cpujul2022.htmlX Refsource MISCThird Party Advisory
ubuntu.com/security/CVE-2020-27820REPORT
lore.kernel.org/dri-devel/20201125202648.5220-1-jcline@redhat.com/REPORT
ubuntu.com/security/notices/USN-5265-1Advisory
ubuntu.com/security/notices/USN-5278-1Advisory
ubuntu.com/security/notices/USN-5413-1Advisory

Show all 13 references

ubuntu.com/security/notices/USN-5415-1Advisory
www.cve.org/CVERecord?id=CVE-2020-27820REPORT
security-tracker.debian.org/tracker/CVE-2020-27820Advisory