CVE-2022-20421: debian debian_linux Use After Free

Modified

AliasesUBUNTU-CVE-2022-20421DEBIAN-CVE-2022-20421

Published 11-10-2022Last modified 14-10-2026

Vulnerability summary

CVE-2022-20421 is a high (CVSS 7.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 50% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

7.8/10

010

High · v3.1 (NVD)

EPSS score

0.63%

0%100%

Low · -0.06 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 12 · Related 8

DLA-3173-1 DSA-5257-1 MGASA-2022-0379 MGASA-2022-0380 USN-5790-1 USN-5791-1+6 more

Timeline

11-10-2022
PublishedVulnerability first disclosed.
14-10-2026
Last modifiedVulnerability information updated.

Description

In binder_inc_ref_for_node of binder.c, there is a possible way to corrupt memory due to a use after free. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-239630375References: Upstream kernel

CVSS metrics

4 scores · 3 sources · 2 versions

v4.07.3v3.17.8

EPSS trend

Probability

0.63%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

Decrease -0.06 pp

From 0.69% 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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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.

Ubuntu83 products

linux< 4.15.0-201.212 | < 5.4.0-136.153 | < 5.15.0-57.63
linux-aws< 4.15.0-1147.159 | < 5.4.0-1093.101 | < 5.15.0-1027.31
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11All versions (No fix recorded)
linux-aws-5.13All versions (No fix recorded)

linux-aws-5.15< 5.15.0-1027.31~20.04.1
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1093.102~18.04.2
linux-aws-5.8All versions (No fix recorded)
linux-aws-fips< 4.15.0-2087.93 | All versions (No fix recorded) | < 5.4.0-1093.101+fips1
linux-aws-hwe< 4.15.0-1147.159~16.04.1
linux-azure< 4.15.0-1158.173~14.04.1 | < 4.15.0-1159.174~16.04.1 | All versions (No fix recorded) | < 5.4.0-1100.106 | < 5.15.0-1030.37
linux-azure-4.15< 4.15.0-1158.173
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13All versions (No fix recorded)
linux-azure-5.15< 5.15.0-1030.37~20.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1100.106~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fde< 5.15.0-1030.37.1
linux-azure-fips< 4.15.0-2067.73 | All versions (No fix recorded) | < 5.4.0-1100.106+fips1
linux-bluefield< 5.4.0-1054.60
linux-dell300x< 4.15.0-1058.63
linux-fips< 4.15.0-1104.115 | All versions (No fix recorded) | < 5.4.0-1069.78
linux-gcp< 4.15.0-1142.158~16.04.1 | All versions (No fix recorded) | < 5.4.0-1097.106 | < 5.15.0-1026.33
linux-gcp-4.15< 4.15.0-1142.158
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13All versions (No fix recorded)
linux-gcp-5.15< 5.15.0-1027.34~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1097.106~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-fips< 4.15.0-2052.57 | All versions (No fix recorded) | < 5.4.0-1097.106+fips1
linux-gke< 5.4.0-1091.98 | < 5.15.0-1024.29
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.15< 5.15.0-1027.32~20.04.1
linux-gke-5.4All versions (No fix recorded)
linux-gkeop< 5.4.0-1061.65 | < 5.15.0-1012.16
linux-gkeop-5.15< 5.15.0-1012.16~20.04.1
linux-gkeop-5.4All versions (No fix recorded)
linux-hwe< 4.15.0-201.212~16.04.1 | All versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13All versions (No fix recorded)
linux-hwe-5.15< 5.15.0-57.63~20.04.1
linux-hwe-5.4< 5.4.0-136.153~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1041.46 | < 5.15.0-1022.25
linux-ibm-5.4< 5.4.0-1041.46~18.04.1
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-intel-iotg< 5.15.0-1023.28
linux-intel-iotg-5.15< 5.15.0-1023.28~20.04.1
linux-iot< 5.4.0-1010.12
linux-kvm< 4.15.0-1133.138 | < 5.4.0-1083.89 | < 5.15.0-1025.30
linux-lowlatency< 5.15.0-57.63
linux-lowlatency-hwe-5.15< 5.15.0-58.64~20.04.1
linux-nvidia< 5.15.0-1015.15
linux-oemAll versions (No fix recorded)
linux-oem-5.10All versions (No fix recorded)
linux-oem-5.13All versions (No fix recorded)
linux-oem-5.14All versions (No fix recorded)
linux-oem-5.17All versions (No fix recorded)
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1112.123~16.04.1 | < 4.15.0-1112.123 | < 5.4.0-1091.100 | < 5.15.0-1026.32
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11All versions (No fix recorded)
linux-oracle-5.13All versions (No fix recorded)
linux-oracle-5.15< 5.15.0-1027.33~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1091.100~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1078.89 | < 5.15.0-1022.24
linux-raspi-5.4< 5.4.0-1078.89~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.15.0-1125.133 | All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded) | < 5.15.0-1029.32
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.15< 5.15.0-1027.31~20.04.1
linux-riscv-5.8All versions (No fix recorded)
linux-snapdragon< 4.15.0-1143.153

Show all 83

Debian2 products

linux< 5.19.11-1
debian_linuxEOL10.0 | 11.0

Google1 product

androidna

3 vendors · 86 products

References

23 links

source.android.com/security/bulletin/2022-10-01PatchVendor Advisory
www.debian.org/security/2022/dsa-5257Vendor AdvisoryThird Party Advisory
lists.debian.org/debian-lts-announce/2022/11/msg00001.htmlMailing ListThird Party Advisory
ubuntu.com/security/CVE-2022-20421REPORT
source.android.com/docs/security/bulletin/2022-10-01REPORT
git.kernel.org/linus/a0e44c64b6061dda7e00b7c458e4523e2331b739REPORT
ubuntu.com/security/notices/USN-5790-1Advisory
ubuntu.com/security/notices/USN-5791-1Advisory
ubuntu.com/security/notices/USN-5792-1Advisory
ubuntu.com/security/notices/USN-5793-1Advisory

Show all 23 references