CVE-2020-25670: debian debian_linux Use After Free

Modified

AliasesUBUNTU-CVE-2020-25670DEBIAN-CVE-2020-25670

Published 26-05-2021Last modified 04-08-2024

Vulnerability summary

CVE-2020-25670 is a high (CVSS 7.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 0.59% chance of exploitation in the next 30 days, higher than 48.1% of scored vulnerabilities. 3 public exploits are recorded.

Priority

Prioritisepublic exploit

Public exploit (reference, Date unknown)

Source freshness unavailable

How is this decided?

CVSS score

7.8/10

010

High · v3.1 (NVD)

EPSS score

0.59%

0%100%

Low · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits3reference

Timeline

26-05-2021
PublishedVulnerability first disclosed.
04-08-2024
Last modifiedVulnerability information updated.

Description

A vulnerability was found in Linux Kernel where refcount leak in llcp_sock_bind() causing use-after-free which might lead to privilege escalations.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.17.8v2.07.2

EPSS trend

Probability

0.59%

Chance of exploitation in the next 30 days

Percentile

48%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.59% 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

3 found

referenceUnverified
Exploit Reference (openwall.com)
Maturity: unknown
referenceUnverified
Exploit Reference (openwall.com)
Maturity: unknown
referenceUnverified
Exploit Reference (openwall.com)
Maturity: unknown

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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.

Ubuntu53 products

linuxAll versions (No fix recorded) | < 4.4.0-222.255 | < 4.15.0-144.148 | < 5.4.0-74.83
linux-aws< 4.4.0-1102.107 | < 4.4.0-1138.152 | < 4.15.0-1103.110 | < 5.4.0-1049.51
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1049.51~18.04.1

linux-aws-5.8< 5.8.0-1038.40~20.04.1
linux-aws-fips< 4.15.0-2045.47 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1103.110~16.04.1
linux-azure< 4.15.0-1115.128~14.04.1 | < 4.15.0-1115.128~16.04.1 | All versions (No fix recorded) | < 5.4.0-1048.50
linux-azure-4.15< 4.15.0-1115.128
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1048.50~18.04.1
linux-azure-5.8< 5.8.0-1036.38~20.04.1
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fips< 4.15.0-2027.30 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-bluefield< 5.4.0-1012.15
linux-dell300x< 4.15.0-1022.26
linux-fips< 4.4.0-1072.78 | All versions (No fix recorded) | < 4.15.0-1060.68
linux-gcp< 4.15.0-1100.113~16.04.1 | All versions (No fix recorded) | < 5.4.0-1044.47
linux-gcp-4.15< 4.15.0-1100.113
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1044.47~18.04.2
linux-gcp-5.8< 5.8.0-1035.37~20.04.1
linux-gcp-edgeAll versions (No fix recorded)
linux-gcp-fipsAll versions (No fix recorded) | < 5.4.0-1067.71~20.04.1
linux-gke< 5.4.0-1044.46
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1044.46~18.04.1
linux-gkeop< 5.4.0-1016.17
linux-gkeop-5.4< 5.4.0-1016.17~18.04.1
linux-hwe< 4.15.0-144.148~16.04.1 | All versions (No fix recorded)
linux-hwe-5.4< 5.4.0-74.83~18.04.1
linux-hwe-5.8< 5.8.0-59.66~20.04.1
linux-hwe-edgeAll versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 4.4.0-1103.112 | < 4.15.0-1092.94 | < 5.4.0-1040.41
linux-lts-xenial< 4.4.0-222.255~14.04.1
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1025.26
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1072.80~16.04.1 | < 4.15.0-1072.80 | < 5.4.0-1046.50
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1046.50~18.04.2
linux-oracle-5.8< 5.8.0-1033.34~20.04.1
linux-raspi< 5.4.0-1036.39
linux-raspi-5.4< 5.4.0-1036.39~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.15.0-1086.91 | All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscvAll versions (No fix recorded)
linux-riscv-5.8< 5.8.0-29.31~20.04.1
linux-snapdragon< 4.15.0-1103.112

Show all 53

Netapp11 products

Show all 11

Debian2 products

linux< 5.10.38-1
debian_linuxEOL9.0

Fedoraproject1 product

fedoraEOL32 | 33 | 34

Linux1 product

linux_kernel≥ 3.6, < 4.4.267 | ≥ 4.5, < 4.9.267 | ≥ 4.10, < 4.14.231 | ≥ 4.15, < 4.19.187 | ≥ 4.20, < 5.4.112 | ≥ 5.5, < 5.10.30 | ≥ 5.11, < 5.11.14

5 vendors · 68 products

References

18 links

www.openwall.com/lists/oss-security/2020/11/01/1Mailing ListX Refsource MLISTExploitPatchThird Party Advisory
lists.fedoraproject.org/archives/…Vendor AdvisoryX Refsource FEDORA
lists.fedoraproject.org/archives/…Vendor AdvisoryX Refsource FEDORA
lists.fedoraproject.org/archives/…Vendor AdvisoryX Refsource FEDORA
www.openwall.com/lists/oss-security/2021/05/11/4Mailing ListX Refsource MLISTExploitPatchThird Party Advisory
www.openwall.com/lists/oss-security/2020/11/01/1X Refsource MISCREPORTExploitMailing ListPatchThird Party Advisory
lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlMailing ListX Refsource MLISTThird Party Advisory
lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlMailing ListX Refsource MLISTThird Party Advisory
security.netapp.com/advisory/ntap-20210702-0008/X Refsource CONFIRMThird Party Advisory
ubuntu.com/security/CVE-2020-25670REPORT

Show all 18 references

ubuntu.com/security/notices/USN-4948-1Advisory
ubuntu.com/security/notices/USN-4977-1Advisory
ubuntu.com/security/notices/USN-4979-1Advisory
ubuntu.com/security/notices/USN-4982-1Advisory
ubuntu.com/security/notices/USN-4999-1Advisory
ubuntu.com/security/notices/USN-5343-1Advisory
www.cve.org/CVERecord?id=CVE-2020-25670REPORT
security-tracker.debian.org/tracker/CVE-2020-25670Advisory