CVE-2021-28964: debian debian_linux

Modified

AliasesUBUNTU-CVE-2021-28964DEBIAN-CVE-2021-28964

Published 22-03-2021Last modified 03-08-2024

Vulnerability summary

CVE-2021-28964 is a medium (CVSS 4.7) vulnerability in debian debian_linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 18.8% 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

0.27%

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

22-03-2021
PublishedVulnerability first disclosed.
03-08-2024
Last modifiedVulnerability information updated.

Description

A race condition was discovered in get_old_root in fs/btrfs/ctree.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (BUG) because of a lack of locking on an extent buffer before a cloning operation, aka CID-dbcc7d57bffc.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.14.7v2.01.9

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.27% 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-362Concurrent Execution using Shared Resource with Improper SynchronizationThe product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

Affected systems

Version check

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

Ubuntu49 products

linuxAll versions (No fix recorded) | < 4.4.0-223.256 | < 4.15.0-144.148 | < 5.4.0-74.83
linux-aws< 4.4.0-1103.108 | < 4.4.0-1139.153 | < 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-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-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< 4.4.0-1073.79 | 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-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< 5.8.0-55.62~20.04.1
linux-hwe-edgeAll versions (No fix recorded)
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 4.4.0-1104.113 | < 4.15.0-1092.94 | < 5.4.0-1040.41
linux-lts-xenial< 4.4.0-223.256~14.04.1
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-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< 5.8.0-26.28~20.04.1
linux-snapdragon< 4.15.0-1103.112