CVE-2021-31829: debian debian_linux Incorrect Authorization

Modified

AliasesUBUNTU-CVE-2021-31829DEBIAN-CVE-2021-31829

Published 06-05-2021Last modified 03-08-2024

Vulnerability summary

CVE-2021-31829 is a medium (CVSS 5.5) Incorrect Authorization vulnerability in debian debian_linux. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 24.2% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

5.5/10

010

Medium · v3.1 (NVD)

EPSS score

0.31%

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 10 · Related 5

DLA-2690-1 MGASA-2021-0214 MGASA-2021-0215 RHSA-2021:4140 RHSA-2021:4356 USN-4983-1+4 more

Timeline

06-05-2021
PublishedVulnerability first disclosed.
03-08-2024
Last modifiedVulnerability information updated.

Description

kernel/bpf/verifier.c in the Linux kernel through 5.12.1 performs undesirable speculative loads, leading to disclosure of stack content via side-channel attacks, aka CID-801c6058d14a. The specific concern is not protecting the BPF stack area against speculative loads. Also, the BPF stack can contain uninitialized data that might represent sensitive information previously operated on by the kernel.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.15.5v2.02.1

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

24%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.31% 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-863Incorrect AuthorizationThe product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Affected systems

Version check

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

Ubuntu54 products

linuxAll versions (No fix recorded) | < 4.15.0-151.157 | < 5.4.0-77.86
linux-awsAll versions (No fix recorded) | < 4.15.0-1109.116 | < 5.4.0-1051.53
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1051.53~18.04.1

linux-aws-5.8< 5.8.0-1038.40~20.04.1
linux-aws-fips< 4.15.0-2051.53 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1109.116~16.04.1
linux-azure< 4.15.0-1121.134~14.04.1 | < 4.15.0-1121.134~16.04.1 | All versions (No fix recorded) | < 5.4.0-1051.53
linux-azure-4.15< 4.15.0-1121.134
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1051.53~18.04.1
linux-azure-5.8< 5.8.0-1036.38~20.04.1
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fde-5.15< 5.15.0-1114.123~20.04.1
linux-azure-fips< 4.15.0-2033.37 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-bluefield< 5.4.0-1013.16
linux-dell300x< 4.15.0-1027.32
linux-fipsAll versions (No fix recorded) | < 4.15.0-1066.75 | < 5.4.0-1028.32
linux-gcp< 4.15.0-1106.120~16.04.1 | All versions (No fix recorded) | < 5.4.0-1046.49
linux-gcp-4.15< 4.15.0-1106.120
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1046.49~18.04.1
linux-gcp-5.8< 5.8.0-1035.37~20.04.1
linux-gcp-edgeAll versions (No fix recorded)
linux-gcp-fips< 4.15.0-2016.18 | All versions (No fix recorded) | < 5.4.0-1067.71~20.04.1
linux-gke< 5.4.0-1046.48
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1046.48~18.04.1
linux-gkeop< 5.4.0-1018.19
linux-gkeop-5.4< 5.4.0-1018.19~18.04.1
linux-hwe< 4.15.0-151.157~16.04.1 | All versions (No fix recorded)
linux-hwe-5.4< 5.4.0-77.86~18.04.1
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-kvmAll versions (No fix recorded) | < 4.15.0-1097.99 | < 5.4.0-1041.42
linux-lts-xenialAll versions (No fix recorded)
linux-oemAll versions (No fix recorded)
linux-oem-5.10< 5.10.0-1029.30
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1078.86~16.04.1 | < 4.15.0-1078.86 | < 5.4.0-1048.52
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1048.52~18.04.1
linux-oracle-5.8< 5.8.0-1033.34~20.04.1
linux-raspi< 5.4.0-1038.41
linux-raspi-5.4< 5.4.0-1038.41~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.15.0-1092.98 | 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< 4.15.0-1109.118