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Fencer Vulns
critical 9.1

CVE-2021-4048 json

An out-of-bounds read flaw was found in the CLARRV, DLARRV, SLARRV, and ZLARRV functions in lapack...

published 2021-12-08 4 y ago modified 2026-09-08 2 mo ago also BIT-openblas-2021-4048 , EUVD-2021-33945 , JLSEC-2025-6

cvss
9.1
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.8%
EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

An out-of-bounds read flaw was found in the CLARRV, DLARRV, SLARRV, and ZLARRV functions in lapack through version 3.10.0, as also used in OpenBLAS before version 0.3.18. Specially crafted inputs passed to these functions could cause an application using lapack to crash or possibly disclose portions of its memory.

Patch / fix

  • bitnami openblas 0.3.18
  • julia LAPACK32_jll 3.10.1+0
  • julia LAPACK_jll 3.10.1+0
  • julia MadNLP 0.2.0
  • julia MadNLPHSL 0.4.0
  • julia OpenBLAS32_jll 0.3.20+0
  • julia OpenBLAS_jll 0.3.20+0
  • julia libjulia_jll 1.8.0+1
  • openblas_project openblas 0.3.18
  • lapack Debian 14, Debian 13, Debian 12 3.10.0-2
  • openblas Debian 14, Debian 13, Debian 12 0.3.18+ds-1

debian advisories DEBIAN-CVE-2021-4048

  • openblas RHEL 8 0.3.15-4.el8
  • openblas-Rblas RHEL 8 0.3.15-4.el8
  • openblas-openmp RHEL 8 0.3.15-4.el8
  • openblas-threads RHEL 8 0.3.15-4.el8
  • openblas-openmp64 RHEL 8 0.3.15-4.el8
  • openblas-serial64 RHEL 8 0.3.15-4.el8
  • openblas-openmp64_ RHEL 8 0.3.15-4.el8
  • openblas-serial64_ RHEL 8 0.3.15-4.el8

red hat advisories RHSA-2022:7639

  • lapack SLE Real Time 15 SP2, SLE Module for Development Tools 15 SP3, SLE Module for Basesystem 15 SP3 3.5.0-4.6.1
  • lapack SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 3.5.0-3.9.1

suse advisories SUSE-SU-2022:0915-1SUSE-SU-2022:0913-1

  • lapack openSUSE Leap 15.3 3.5.0-4.6.1
  • lapack-man openSUSE Leap 15.3 3.5.0-4.6.1

opensuse advisories openSUSE-SU-2022:0915-1

  • openblas AlmaLinux 8 0.3.15-4.el8
  • openblas-Rblas AlmaLinux 8 0.3.15-4.el8
  • openblas-openmp AlmaLinux 8 0.3.15-4.el8
  • openblas-threads AlmaLinux 8 0.3.15-4.el8
  • openblas-openmp64 AlmaLinux 8 0.3.15-4.el8
  • openblas-serial64 AlmaLinux 8 0.3.15-4.el8
  • openblas-openmp64_ AlmaLinux 8 0.3.15-4.el8
  • openblas-serial64_ AlmaLinux 8 0.3.15-4.el8

almalinux advisories ALSA-2022:7639

  • openblas Rocky Linux 8 0.3.15-4.el8

rocky linux advisories RLSA-2022:7639

  • lapack CBL-Mariner 2.0 3.10.0-6
  • openblas CBL-Mariner 2.0 0.3.21-1

azure linux advisories AZL-6609AZL-7315

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

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-2021-4048 updated cvss 5.9

lapack: Out-of-bounds read in *larrv

  • Red Hat Ceph Storage 2 ceph, librbd1, librgw2, ceph-mds, ceph-mon, ceph-osd, +12 more Red Hat Ceph Storage 3 ceph, librbd1, librgw2, ceph-mds, ceph-mgr, ceph-mon, +15 more Red Hat Ceph Storage 4 ceph, librbd1, librgw2, rbd-nbd, ceph-mds, ceph-mgr, +27 more
    affected: no fix planned “Will not fix”
  • Red Hat Ceph Storage 5 ceph, cephadm, librbd1, librgw2, rbd-nbd, ceph-mds, +33 more Red Hat Enterprise Linux 6 blas, lapack Red Hat Enterprise Linux 7 blas, blas64, lapack, lapack64
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 blas, blas64, lapack, lapack64 Red Hat Enterprise Linux 9 blas, blas64, lapack, blas64_, lapack64, lapack64_
    affected: no fix planned “Will not fix”
  • Red Hat Openshift Container Storage 4 ocs4/cephcsi-rhel8, ocs4/rook-ceph-rhel8-operator
    affected: no fix available
  • Red Hat CodeReady Linux Builder (v. 8) openblas-Rblas 0.3.15-4.el8, openblas-openmp 0.3.15-4.el8, openblas-openmp64 0.3.15-4.el8, openblas-serial64 0.3.15-4.el8, openblas-openmp64_ 0.3.15-4.el8, openblas-serial64_ 0.3.15-4.el8, +2 more Red Hat Enterprise Linux AppStream (v. 8) openblas 0.3.15-4.el8, openblas-threads 0.3.15-4.el8
    fixed: vendor fix RHSA-2022:7639
  • Red Hat RHODF 4.14 for RHEL 9 odf4/cephcsi-rhel9 v4.14.0-29, odf4/rook-ceph-rhel9-operator v4.14.0-71
    fixed: vendor fix RHSA-2023:6832
  • Red Hat Enterprise Linux 9 openblas, openblas-openmp, openblas-serial, openblas-threads, openblas-openmp64, openblas-serial64, +4 more Red Hat RHODF 4.14 for RHEL 9 odf4/mcg-cli-rhel9 v4.14.0-44, odf4/mcg-core-rhel9 v4.14.0-63, odf4/odf-console-rhel9 v4.14.0-77, odf4/mcg-rhel9-operator v4.14.0-43, odf4/ocs-rhel9-operator v4.14.0-67, odf4/odf-rhel9-operator v4.14.0-18, +18 more
    not affected: vulnerable code not present

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

Exploit prediction

2.76% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 6.4 AV:N/AC:L/Au:N/C:P/I:N/A:P
OSV 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected packages

ecosystem package affected fixed in
bitnami openblas
<0.3.18
0.3.18
julia LAPACK32_jll
<3.10.1+0
3.10.1+0
julia LAPACK_jll
<3.10.1+0
3.10.1+0
julia MadNLP
<0.2.0
0.2.0
julia MadNLPHSL
<0.4.0
0.4.0
julia MadNLPPardiso
all versions
 no fix listed
julia OpenBLAS32_jll
<0.3.20+0
0.3.20+0
julia OpenBLASHighCoreCount_jll
all versions
 no fix listed
julia OpenBLAS_jll
<0.3.20+0
0.3.20+0
julia libjulia_jll
<1.8.0+1
1.8.0+1

Affected products

  • n/a lapack

Classification

Weakness

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.