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Fencer Vulns
medium 5.5

CVE-2021-33631 json

Kernel crash in EXT4 filesystem

published 2024-01-18 2 y ago modified 2026-06-17 4 mo ago also EUVD-2021-20308

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits
0
none known

Summary

Integer Overflow or Wraparound vulnerability in openEuler kernel on Linux (filesystem modules) allows Forced Integer Overflow.This issue affects openEuler kernel: from 4.19.90 before 4.19.90-2401.3, from 5.10.0-60.18.0 before 5.10.0-183.0.0.

Patch / fix

  • openatom openeuler 4.19.90-2401.3, 5.10.0-183.0.0
  • linux Debian 14, Debian 13, Debian 12 6.1.4-1

debian advisories DEBIAN-CVE-2021-33631

  • linux Ubuntu 20.04 LTS 5.4.0-156.173
  • linux Ubuntu 22.04 LTS 5.15.0-69.76
  • linux-aws Ubuntu 20.04 LTS 5.4.0-1107.115
  • linux-aws Ubuntu 22.04 LTS 5.15.0-1033.37
  • linux-gcp Ubuntu 20.04 LTS 5.4.0-1110.119
  • linux-gcp Ubuntu 22.04 LTS 5.15.0-1031.38
  • linux-gke Ubuntu 22.04 LTS 5.15.0-1030.35
  • linux-ibm Ubuntu 20.04 LTS 5.4.0-1054.59

ubuntu advisories UBUNTU-CVE-2021-33631

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • kernel RHEL 9 5.14.0-284.11.1.el9_2
  • perf RHEL 9 5.14.0-284.11.1.el9_2
  • rtla RHEL 9 5.14.0-284.11.1.el9_2
  • bpftool RHEL 9 7.0.0-284.11.1.el9_2
  • kernel-64k RHEL 9 5.14.0-284.11.1.el9_2
  • kernel-core RHEL 9 5.14.0-284.11.1.el9_2
  • kernel-tools RHEL 9 5.14.0-284.11.1.el9_2
  • python3-perf RHEL 9 5.14.0-284.11.1.el9_2

red hat advisories RHSA-2023:2458RHSA-2023:2148RHSA-2024:2621RHSA-2024:1836RHSA-2024:1840RHSA-2024:1653

  • dtb-aarch64 openSUSE Leap 15.5 5.14.21-150500.55.49.1
  • kernel-64kb SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.49.1
  • kernel-syms SLE Module for Development Tools 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.49.1
  • kernel-obs-qa openSUSE Leap 15.5 5.14.21-150500.55.49.1
  • kernel-source SLE Module for Development Tools 15 SP5, SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.49.1
  • kernel-default SLE Workstation Extension 15 SP5, SLE Module for Legacy 15 SP5, SLE Module for Basesystem 15 SP5 +4 more 5.14.21-150500.55.49.1
  • kernel-kvmsmall openSUSE Leap 15.5 5.14.21-150500.55.49.1
  • kernel-zfcpdump SLE Module for Basesystem 15 SP5, openSUSE Leap 15.5 5.14.21-150500.55.49.1

suse advisories SUSE-SU-2024:0516-1SUSE-SU-2024:0515-1SUSE-SU-2024:0514-1SUSE-SU-2024:0484-1SUSE-SU-2024:0483-1SUSE-SU-2024:0478-1

  • kernel AlmaLinux 8 4.18.0-513.24.1.el8_9
  • perf AlmaLinux 8 4.18.0-513.24.1.el8_9
  • bpftool AlmaLinux 8 4.18.0-513.24.1.el8_9
  • kernel-core AlmaLinux 8 4.18.0-513.24.1.el8_9
  • kernel-tools AlmaLinux 8 4.18.0-513.24.1.el8_9
  • python3-perf AlmaLinux 8 4.18.0-513.24.1.el8_9
  • kernel-modules AlmaLinux 8 4.18.0-513.24.1.el8_9
  • kernel-zfcpdump AlmaLinux 8 4.18.0-513.24.1.el8_9

almalinux advisories ALSA-2024:1607

  • kernel Rocky Linux 8 4.18.0-513.24.1.el8_9.cloud.0.1
  • kernel-rt Rocky Linux 8 4.18.0-513.24.1.rt7.326.el8_9
  • kernel Rocky Linux 8 4.18.0-513.24.1.el8_9

rocky linux advisories RXSA-2024:1607RLSA-2024:1614RLSA-2024:1607

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-33631 updated cvss 6.7

kernel: ext4: kernel bug in ext4_write_inline_data_end()

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-513.24.1.el8_9, kernel-debuginfo-common-aarch64 4.18.0-513.24.1.el8_9, kernel-debuginfo-common-ppc64le 4.18.0-513.24.1.el8_9
    fixed: vendor fix RHSA-2024:1607
  • Red Hat CodeReady Linux Builder EUS (v.8.6) kernel-debuginfo-common-x86_64 4.18.0-372.98.1.el8_6, kernel-debuginfo-common-aarch64 4.18.0-372.98.1.el8_6, kernel-debuginfo-common-ppc64le 4.18.0-372.98.1.el8_6
    fixed: vendor fix RHSA-2024:1653
  • Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-debuginfo-common-x86_64 4.18.0-477.55.1.el8_8, kernel-debuginfo-common-aarch64 4.18.0-477.55.1.el8_8, kernel-debuginfo-common-ppc64le 4.18.0-477.55.1.el8_8
    fixed: vendor fix RHSA-2024:2621
  • Red Hat CodeReady Linux Builder EUS (v.9.0) kernel-debuginfo-common-s390x 5.14.0-70.97.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.97.1.el9_0, kernel-debuginfo-common-aarch64 5.14.0-70.97.1.el9_0, kernel-debuginfo-common-ppc64le 5.14.0-70.97.1.el9_0
    fixed: vendor fix RHSA-2024:1836
  • Red Hat Enterprise Linux AppStream (v. 9) perf 5.14.0-284.11.1.el9_2, rtla 5.14.0-284.11.1.el9_2, kernel-devel-matched 5.14.0-284.11.1.el9_2, kernel-64k-devel-matched 5.14.0-284.11.1.el9_2, kernel-debug-devel-matched 5.14.0-284.11.1.el9_2, kernel-debuginfo-common-s390x 5.14.0-284.11.1.el9_2, +5 more
    fixed: vendor fix RHSA-2023:2458
  • Red Hat Enterprise Linux AppStream EUS (v.9.0) perf 5.14.0-70.97.1.el9_0, kernel-devel-matched 5.14.0-70.97.1.el9_0, kernel-debug-devel-matched 5.14.0-70.97.1.el9_0, kernel-debuginfo-common-s390x 5.14.0-70.97.1.el9_0, kernel-zfcpdump-devel-matched 5.14.0-70.97.1.el9_0, kernel-debuginfo-common-x86_64 5.14.0-70.97.1.el9_0, +2 more
    fixed: vendor fix RHSA-2024:1836
  • Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-513.24.1.el8_9, kernel 4.18.0-513.24.1.el8_9, bpftool 4.18.0-513.24.1.el8_9, kernel-core 4.18.0-513.24.1.el8_9, kernel-tools 4.18.0-513.24.1.el8_9, python3-perf 4.18.0-513.24.1.el8_9, +15 more
    fixed: vendor fix RHSA-2024:1607
show 13 more
  • Red Hat Enterprise Linux BaseOS (v. 9) bpftool 7.0.0-284.11.1.el9_2, kernel 5.14.0-284.11.1.el9_2, kernel-64k 5.14.0-284.11.1.el9_2, kernel-core 5.14.0-284.11.1.el9_2, kernel-tools 5.14.0-284.11.1.el9_2, python3-perf 5.14.0-284.11.1.el9_2, +28 more
    fixed: vendor fix RHSA-2023:2458
  • Red Hat Enterprise Linux BaseOS EUS (v.8.6) perf 4.18.0-372.98.1.el8_6, kernel 4.18.0-372.98.1.el8_6, bpftool 4.18.0-372.98.1.el8_6, kernel-core 4.18.0-372.98.1.el8_6, kernel-tools 4.18.0-372.98.1.el8_6, python3-perf 4.18.0-372.98.1.el8_6, +15 more
    fixed: vendor fix RHSA-2024:1653
  • Red Hat Enterprise Linux BaseOS EUS (v.8.8) perf 4.18.0-477.55.1.el8_8, kernel 4.18.0-477.55.1.el8_8, bpftool 4.18.0-477.55.1.el8_8, kernel-core 4.18.0-477.55.1.el8_8, kernel-tools 4.18.0-477.55.1.el8_8, python3-perf 4.18.0-477.55.1.el8_8, +15 more
    fixed: vendor fix RHSA-2024:2621
  • Red Hat Enterprise Linux BaseOS EUS (v.9.0) kernel 5.14.0-70.97.1.el9_0, bpftool 5.14.0-70.97.1.el9_0, kernel-core 5.14.0-70.97.1.el9_0, kernel-tools 5.14.0-70.97.1.el9_0, python3-perf 5.14.0-70.97.1.el9_0, kernel-modules 5.14.0-70.97.1.el9_0, +14 more
    fixed: vendor fix RHSA-2024:1836
  • Red Hat Enterprise Linux CRB (v. 9) kernel-debuginfo-common-s390x 5.14.0-284.11.1.el9_2, kernel-debuginfo-common-x86_64 5.14.0-284.11.1.el9_2, kernel-debuginfo-common-aarch64 5.14.0-284.11.1.el9_2, kernel-debuginfo-common-ppc64le 5.14.0-284.11.1.el9_2
    fixed: vendor fix RHSA-2023:2458
  • Red Hat Enterprise Linux for Real Time (v. 8) kernel-rt 4.18.0-513.24.1.rt7.326.el8_9, kernel-rt-core 4.18.0-513.24.1.rt7.326.el8_9, kernel-rt-modules 4.18.0-513.24.1.rt7.326.el8_9, kernel-rt-debug-core 4.18.0-513.24.1.rt7.326.el8_9, kernel-rt-debug-modules 4.18.0-513.24.1.rt7.326.el8_9, kernel-rt-modules-extra 4.18.0-513.24.1.rt7.326.el8_9, +2 more
    fixed: vendor fix RHSA-2024:1614
  • Red Hat Enterprise Linux NFV (v. 9) kernel-rt 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-kvm 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-core 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-modules 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-debug-kvm 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-debug-core 5.14.0-284.11.1.rt14.296.el9_2, +6 more
    fixed: vendor fix RHSA-2023:2148
  • Red Hat Enterprise Linux Real Time EUS (v.9.0) kernel-rt 5.14.0-70.97.1.rt21.169.el9_0, kernel-rt-core 5.14.0-70.97.1.rt21.169.el9_0, kernel-rt-modules 5.14.0-70.97.1.rt21.169.el9_0, kernel-rt-debug-core 5.14.0-70.97.1.rt21.169.el9_0, kernel-rt-debug-modules 5.14.0-70.97.1.rt21.169.el9_0, kernel-rt-modules-extra 5.14.0-70.97.1.rt21.169.el9_0, +2 more
    fixed: vendor fix RHSA-2024:1840
  • Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-513.24.1.rt7.326.el8_9, kernel-rt-kvm 4.18.0-513.24.1.rt7.326.el8_9, kernel-rt-core 4.18.0-513.24.1.rt7.326.el8_9, kernel-rt-modules 4.18.0-513.24.1.rt7.326.el8_9, kernel-rt-debug-kvm 4.18.0-513.24.1.rt7.326.el8_9, kernel-rt-debug-core 4.18.0-513.24.1.rt7.326.el8_9, +4 more
    fixed: vendor fix RHSA-2024:1614
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.0) kernel-rt 5.14.0-70.97.1.rt21.169.el9_0, kernel-rt-kvm 5.14.0-70.97.1.rt21.169.el9_0, kernel-rt-core 5.14.0-70.97.1.rt21.169.el9_0, kernel-rt-modules 5.14.0-70.97.1.rt21.169.el9_0, kernel-rt-debug-kvm 5.14.0-70.97.1.rt21.169.el9_0, kernel-rt-debug-core 5.14.0-70.97.1.rt21.169.el9_0, +4 more
    fixed: vendor fix RHSA-2024:1840
  • Red Hat Enterprise Linux RT (v. 9) kernel-rt 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-core 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-modules 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-debug-core 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-modules-core 5.14.0-284.11.1.rt14.296.el9_2, kernel-rt-debug-modules 5.14.0-284.11.1.rt14.296.el9_2, +4 more
    fixed: vendor fix RHSA-2023:2148
  • Red Hat Virtualization 4 Hypervisor for RHEL 8 perf 4.18.0-372.98.1.el8_6, kernel-debuginfo-common-x86_64 4.18.0-372.98.1.el8_6
    fixed: vendor fix RHSA-2024:1653
  • Red Hat RHOL 5.7 for RHEL 8 openshift-logging/vector-rhel8 v0.28.1-57, openshift-logging/kibana6-rhel8 v6.8.1-431, openshift-logging/fluentd-rhel8 v1.14.6-215, openshift-logging/eventrouter-rhel8 v0.4.0-248, openshift-logging/logging-loki-rhel8 v2.9.6-15, openshift-logging/loki-rhel8-operator v5.7.13-12, +12 more
    fixed: vendor fix RHSA-2024:2093

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 y ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • openEuler kernel

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.