# CVE-2021-4048: Information disclosure in lapack > An out-of-bounds read in LAPACK functions allows attackers to crash applications or disclose memory contents via crafted inputs. - **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 8 Dec 2021 - **Updated:** 3 Aug 2024 - **Also known as:** ALSA-2022:7639, AZL-6609, AZL-7315, BIT-openblas-2021-4048, CLSA-2026-1784622156, CLSA-2026-1790332295, DEBIAN-CVE-2021-4048, GHSA-wgf2-cvhg-c384, JLSEC-2025-6, MGASA-2021-0586, OESA-2021-1471, OESA-2021-1478, OESA-2022-1947, RHSA-2022:7639, RLSA-2022:7639, SUSE-SU-2022:0913-1, SUSE-SU-2022:0915-1, UBUNTU-CVE-2021-4048, openSUSE-SU-2022:0915-1, openSUSE-SU-2024:11704-1 ## What is CVE-2021-4048? CVE-2021-4048 is a critical vulnerability in Fedoraproject Fedora, published on 8 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description 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. Weakness: CWE-125 (Out-of-bounds Read) ## Which versions are affected by CVE-2021-4048? 1 open source package ship an affected version, including openblas. It affects 8 products. | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `openblas` | Bitnami | All versions | 0.3.18 | | `openblas` | AlmaLinux:8 | All versions | 0.3.15-4.el8 | | `openblas-Rblas` | AlmaLinux:8 | All versions | 0.3.15-4.el8 | | `openblas-devel` | AlmaLinux:8 | All versions | 0.3.15-4.el8 | | `openblas-openmp` | AlmaLinux:8 | All versions | 0.3.15-4.el8 | | `openblas-openmp64` | AlmaLinux:8 | All versions | 0.3.15-4.el8 | | `openblas-openmp64_` | AlmaLinux:8 | All versions | 0.3.15-4.el8 | | `openblas-serial64` | AlmaLinux:8 | All versions | 0.3.15-4.el8 | | `openblas-serial64_` | AlmaLinux:8 | All versions | 0.3.15-4.el8 | | `openblas-static` | AlmaLinux:8 | All versions | 0.3.15-4.el8 | | `openblas-threads` | AlmaLinux:8 | All versions | 0.3.15-4.el8 | | `openblas-threads64` | AlmaLinux:8 | All versions | 0.3.15-4.el8 | | `openblas-threads64_` | AlmaLinux:8 | All versions | 0.3.15-4.el8 | | `openblas` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-Rblas-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-debugsource` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-openmp-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-openmp64-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-openmp64_-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-serial64-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-serial64_-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-threads` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-threads-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-threads64-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-threads64_-debuginfo` | Red Hat:enterprise_linux:8::appstream | All versions | 0:0.3.15-4.el8 | | `openblas-Rblas` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-Rblas-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-debugsource` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-devel` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-openmp` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-openmp-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-openmp64` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-openmp64-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-openmp64_` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-openmp64_-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-serial64` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-serial64-debuginfo` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | | `openblas-serial64_` | Red Hat:enterprise_linux:8::crb | All versions | 0:0.3.15-4.el8 | Products: Fedoraproject Fedora, Julialang Julia, Lapack Project Lapack, Openblas Project Openblas, Redhat Ceph Storage, Redhat Enterprise Linux, Redhat Openshift Container Storage, Redhat Openshift Data Foundation. ## How do I fix CVE-2021-4048? Upgrade openblas to 0.3.18 or later. ## Is CVE-2021-4048 being exploited? There is no known exploitation of CVE-2021-4048 in the wild and no public exploit code. ## Other vulnerabilities in Fedoraproject Fedora - [CVE-2024-4577](https://insights.sbomify.com/CVE-2024-4577/): PHP-CGI OS Command Injection (critical 9.8, exploited in the wild) - [CVE-2021-39226](https://insights.sbomify.com/CVE-2021-39226/): Grafana Authentication Bypass (critical 9.8, exploited in the wild) - [CVE-2019-5544](https://insights.sbomify.com/CVE-2019-5544/): VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow (critical 9.8, exploited in the wild) - [CVE-2024-4947](https://insights.sbomify.com/CVE-2024-4947/): Google Chromium V8 Type Confusion (critical 9.6, exploited in the wild) - [CVE-2024-4671](https://insights.sbomify.com/CVE-2024-4671/): Google Chromium Visuals Use-After-Free (critical 9.6, exploited in the wild) ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2021-4048 and fix it if it is affected. What it is: CVE-2021-4048 is a critical vulnerability in Fedoraproject Fedora, published on 8 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2021-4048 in the wild and no public exploit code. Affected packages and fixed versions: - openblas (Bitnami): affected all versions; fixed in 0.3.18 Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2021-4048/ (Markdown: https://insights.sbomify.com/CVE-2021-4048/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2021-4048 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-4048 - OSV: https://osv.dev/vulnerability/CVE-2021-4048 --- From sbomify Insights: https://insights.sbomify.com/CVE-2021-4048/ Summaries are generated and may contain mistakes; the official description above is the record.