CVE-2021-4159: debian debian_linux

Modified

AliasesUBUNTU-CVE-2021-4159DEBIAN-CVE-2021-4159

Published 24-08-2022Last modified 02-11-2026

Vulnerability summary

CVE-2021-4159 is a medium (CVSS 4.4) vulnerability in debian debian_linux. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 16.2% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 4.4, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

4.4/10

010

Medium · v3.1 (NVD)

EPSS score

0.25%

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

Advisory lineage

Upstream 0 · Downstream 9 · Related 8

DLA-3131-1 OPENSUSE-SU-2022:0363-1 SUSE-SU-2022:0363-1 SUSE-SU-2025:01983-1 USN-5668-1 USN-5677-1+3 more

Timeline

24-08-2022
PublishedVulnerability first disclosed.
02-11-2026
Last modifiedVulnerability information updated.

Description

A vulnerability was found in the Linux kernel's EBPF verifier when handling internal data structures. Internal memory locations could be returned to userspace. A local attacker with the permissions to insert eBPF code to the kernel can use this to leak internal kernel memory details defeating some of the exploit mitigations in place for the kernel.

CVSS metrics

4 scores · 3 sources · 2 versions

v4.08.5v3.14.4

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.25% 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-202Exposure of Sensitive Information Through Data QueriesWhen trying to keep information confidential, an attacker can often infer some of the information by using statistics.

Affected systems

Version check

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

Ubuntu57 products

linux< 4.15.0-201.212 | < 5.4.0-128.144
linux-aws< 4.15.0-1147.159 | < 5.4.0-1086.93
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1086.93~18.04.1

linux-aws-5.8All versions (No fix recorded)
linux-aws-fips< 4.15.0-2087.93 | All versions (No fix recorded) | < 5.4.0-1086.93+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) | < 5.4.0-1094.100
linux-azure-4.15< 4.15.0-1158.173
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1094.100~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fips< 4.15.0-2067.73 | All versions (No fix recorded) | < 5.4.0-1094.100+fips1
linux-bluefield< 5.4.0-1047.52
linux-dell300x< 4.15.0-1058.63
linux-fips< 4.15.0-1104.115 | All versions (No fix recorded) | < 5.4.0-1062.70
linux-gcp< 4.15.0-1142.158~16.04.1 | All versions (No fix recorded) | < 5.4.0-1090.98
linux-gcp-4.15< 4.15.0-1142.158
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1092.101~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-fips< 4.15.0-2052.57 | All versions (No fix recorded) | < 5.4.0-1092.101+fips1
linux-gke< 5.4.0-1084.90
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4All versions (No fix recorded)
linux-gkeop< 5.4.0-1054.57
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-5.4< 5.4.0-128.144~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1034.38
linux-ibm-5.4< 5.4.0-1034.38~18.04.1
linux-intel-5.13All versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-iot< 5.4.0-1005.7
linux-kvm< 4.15.0-1133.138 | < 5.4.0-1076.81
linux-oemAll versions (No fix recorded)
linux-oem-5.10All versions (No fix recorded)
linux-oem-5.13All versions (No fix recorded)
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1112.123~16.04.1 | < 4.15.0-1112.123 | < 5.4.0-1084.92
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1084.92~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1071.81
linux-raspi-5.4< 5.4.0-1071.81~18.04.1
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)
linux-riscvAll versions (No fix recorded)
linux-riscv-5.8All versions (No fix recorded)
linux-snapdragon< 4.15.0-1143.153