CVE-2021-4155: linux linux_kernel Incorrect Calculation of Buffer Size

Modified

AliasesRHSA-2022:0335RHSA-2022:0344RHSA-2022:0530+2 more

Published 24-08-2022Last modified 03-08-2024

Vulnerability summary

CVE-2021-4155 is a medium (CVSS 5.5) Incorrect Calculation of Buffer Size vulnerability in linux linux_kernel. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 23% 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

0.30%

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

24-08-2022
PublishedVulnerability first disclosed.
03-08-2024
Last modifiedVulnerability information updated.

Description

A data leak flaw was found in the way XFS_IOC_ALLOCSP IOCTL in the XFS filesystem allowed for size increase of files with unaligned size. A local attacker could use this flaw to leak data on the XFS filesystem otherwise not accessible to them.

CVSS metrics

5 scores · 4 sources · 2 versions

v4.06.8v3.15.5

EPSS trend

Probability

0.30%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.30% 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-131Incorrect Calculation of Buffer SizeThe product does not correctly calculate the size to be used when allocating a buffer.

Affected systems

Version check

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

Ubuntu68 products

linuxAll versions (No fix recorded) | < 4.4.0-237.271 | < 4.15.0-169.177 | < 5.4.0-100.113
linux-aws< 4.4.0-1116.122 | < 4.4.0-1154.169 | < 4.15.0-1121.129 | < 5.4.0-1066.69
linux-aws-5.0All versions (No fix recorded)
linux-aws-5.11All versions (No fix recorded)
linux-aws-5.13< 5.13.0-1014.15~20.04.1

linux-aws-5.3All versions (No fix recorded)
linux-aws-5.4< 5.4.0-1066.69~18.04.1
linux-aws-5.8All versions (No fix recorded)
linux-aws-fips< 4.15.0-2061.63 | All versions (No fix recorded) | < 5.4.0-1069.73+fips2
linux-aws-hwe< 4.15.0-1120.128~16.04.1
linux-azure< 4.15.0-1131.144~14.04.1 | < 4.15.0-1131.144~16.04.1 | All versions (No fix recorded) | < 5.4.0-1070.73
linux-azure-4.15< 4.15.0-1131.144
linux-azure-5.11All versions (No fix recorded)
linux-azure-5.13< 5.13.0-1014.16~20.04.1
linux-azure-5.3All versions (No fix recorded)
linux-azure-5.4< 5.4.0-1070.73~18.04.1
linux-azure-5.8All versions (No fix recorded)
linux-azure-edgeAll versions (No fix recorded)
linux-azure-fips< 4.15.0-2043.47 | All versions (No fix recorded) | < 5.4.0-1073.76+fips1
linux-bluefield< 5.4.0-1028.31
linux-dell300x< 4.15.0-1035.40
linux-fips< 4.4.0-1086.93 | All versions (No fix recorded) | < 4.15.0-1078.87 | < 5.4.0-1043.49
linux-gcp< 4.15.0-1116.130~16.04.1 | All versions (No fix recorded) | < 5.4.0-1065.69
linux-gcp-4.15< 4.15.0-1116.130
linux-gcp-5.11All versions (No fix recorded)
linux-gcp-5.13< 5.13.0-1015.18~20.04.1
linux-gcp-5.3All versions (No fix recorded)
linux-gcp-5.4< 5.4.0-1065.69~18.04.1
linux-gcp-5.8All versions (No fix recorded)
linux-gcp-fips< 4.15.0-2026.28 | All versions (No fix recorded) | < 5.4.0-1067.71~20.04.1
linux-gke< 5.4.0-1063.66
linux-gke-4.15All versions (No fix recorded)
linux-gke-5.4< 5.4.0-1063.66~18.04.1
linux-gkeop< 5.4.0-1034.35
linux-gkeop-5.4< 5.4.0-1034.35~18.04.1
linux-hwe< 4.15.0-169.177~16.04.1 | All versions (No fix recorded)
linux-hwe-5.11All versions (No fix recorded)
linux-hwe-5.13< 5.13.0-30.33~20.04.1
linux-hwe-5.4< 5.4.0-100.113~18.04.1
linux-hwe-5.8All versions (No fix recorded)
linux-hwe-edgeAll versions (No fix recorded)
linux-ibm< 5.4.0-1015.16
linux-ibm-5.4< 5.4.0-1015.16~18.04.1
linux-intel-5.13< 5.13.0-1010.10
linux-intel-iot-realtimeAll versions (No fix recorded)
linux-kvm< 4.4.0-1117.127 | < 4.15.0-1107.109 | < 5.4.0-1056.58
linux-lts-xenial< 4.4.0-237.271~14.04.1
linux-oemAll versions (No fix recorded)
linux-oem-5.10All versions (No fix recorded)
linux-oem-5.13All versions (No fix recorded)
linux-oem-5.14< 5.14.0-1022.24
linux-oem-5.6All versions (No fix recorded)
linux-oracle< 4.15.0-1087.95~16.04.1 | < 4.15.0-1087.95 | < 5.4.0-1064.68
linux-oracle-5.0All versions (No fix recorded)
linux-oracle-5.11All versions (No fix recorded)
linux-oracle-5.13< 5.13.0-1018.22~20.04.1
linux-oracle-5.3All versions (No fix recorded)
linux-oracle-5.4< 5.4.0-1064.68~18.04.1
linux-oracle-5.8All versions (No fix recorded)
linux-raspi< 5.4.0-1053.60
linux-raspi-5.4< 5.4.0-1053.60~18.04.1
linux-raspi-realtimeAll versions (No fix recorded)
linux-raspi2< 4.15.0-1103.110 | All versions (No fix recorded)
linux-realtimeAll versions (No fix recorded)
linux-riscvAll versions (No fix recorded)
linux-riscv-5.11All versions (No fix recorded)
linux-riscv-5.8All versions (No fix recorded)
linux-snapdragon< 4.15.0-1120.129

Show all 68

Redhat55 products

bpftool< 0:4.18.0-147.59.1.el8_1
bpftool-debuginfo< 0:4.18.0-147.59.1.el8_1
kernel< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
kernel-abi-whitelists< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
kernel-core< 0:4.18.0-147.59.1.el8_1

kernel-debug< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
kernel-debug-core< 0:4.18.0-147.59.1.el8_1
kernel-debug-debuginfo< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
kernel-debug-devel< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
kernel-debug-modules< 0:4.18.0-147.59.1.el8_1
kernel-debug-modules-extra< 0:4.18.0-147.59.1.el8_1
kernel-debuginfo< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
kernel-debuginfo-common-ppc64le< 0:4.18.0-147.59.1.el8_1
kernel-debuginfo-common-x86_64< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
kernel-devel< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
kernel-doc< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
kernel-modules< 0:4.18.0-147.59.1.el8_1
kernel-modules-extra< 0:4.18.0-147.59.1.el8_1
kernel-tools< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
kernel-tools-debuginfo< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
kernel-tools-libs< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
kernel-tools-libs-devel< 0:3.10.0-693.96.1.el7
kpatch-patch-4_18_0-147_43_1< 0:1-10.el8_1
kpatch-patch-4_18_0-147_43_1-debuginfo< 0:1-10.el8_1
kpatch-patch-4_18_0-147_43_1-debugsource< 0:1-10.el8_1
kpatch-patch-4_18_0-147_44_1< 0:1-9.el8_1
kpatch-patch-4_18_0-147_44_1-debuginfo< 0:1-9.el8_1
kpatch-patch-4_18_0-147_44_1-debugsource< 0:1-9.el8_1
kpatch-patch-4_18_0-147_48_1< 0:1-6.el8_1
kpatch-patch-4_18_0-147_48_1-debuginfo< 0:1-6.el8_1
kpatch-patch-4_18_0-147_48_1-debugsource< 0:1-6.el8_1
kpatch-patch-4_18_0-147_51_1< 0:1-5.el8_1
kpatch-patch-4_18_0-147_51_1-debuginfo< 0:1-5.el8_1
kpatch-patch-4_18_0-147_51_1-debugsource< 0:1-5.el8_1
kpatch-patch-4_18_0-147_51_2< 0:1-4.el8_1
kpatch-patch-4_18_0-147_51_2-debuginfo< 0:1-4.el8_1
kpatch-patch-4_18_0-147_51_2-debugsource< 0:1-4.el8_1
kpatch-patch-4_18_0-147_52_1< 0:1-3.el8_1
kpatch-patch-4_18_0-147_52_1-debuginfo< 0:1-3.el8_1
kpatch-patch-4_18_0-147_52_1-debugsource< 0:1-3.el8_1
kpatch-patch-4_18_0-147_54_2< 0:1-2.el8_1
kpatch-patch-4_18_0-147_54_2-debuginfo< 0:1-2.el8_1
kpatch-patch-4_18_0-147_54_2-debugsource< 0:1-2.el8_1
kpatch-patch-4_18_0-147_56_1< 0:1-2.el8_1
kpatch-patch-4_18_0-147_56_1-debuginfo< 0:1-2.el8_1
kpatch-patch-4_18_0-147_56_1-debugsource< 0:1-2.el8_1
kpatch-patch-4_18_0-147_57_1< 0:1-1.el8_1
kpatch-patch-4_18_0-147_57_1-debuginfo< 0:1-1.el8_1
kpatch-patch-4_18_0-147_57_1-debugsource< 0:1-1.el8_1
perf< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
perf-debuginfo< 0:4.18.0-147.59.1.el8_1 | < 0:3.10.0-693.96.1.el7
python-perf< 0:3.10.0-693.96.1.el7
python-perf-debuginfo< 0:3.10.0-693.96.1.el7
python3-perf< 0:4.18.0-147.59.1.el8_1
python3-perf-debuginfo< 0:4.18.0-147.59.1.el8_1