# ALSA-2021:4198: edk2-ovmf security update

ALSA-2021:4198, released November 9, 2021, fixes 2 CVEs in edk2-ovmf (version 20210527gite1999b264f1f-3.el8). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/alsa-2021-4198
- Platform: Linux
- Released: Nov 9, 2021
- Priority: High (Closes CVE-2021-23840, high severity)
- CVEs: 2, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://osv.dev/vulnerability/ALSA-2021:4198

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [edk2-ovmf](https://patchblox.com/security/data/product/linux/edk2-ovmf.md) | almalinux 8 | 20210527gite1999b264f1f-3.el8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-23840](https://patchblox.com/security/data/cve/CVE-2021-23840.md) | High | libssl3t64: Calls to EVP_CipherUpdate, EVP_EncryptUpdate and EVP_DecryptUpdate mayoverflow the output length argument in some cas... | 7.5 | 0.5073 |  |
| [CVE-2021-23841](https://patchblox.com/security/data/cve/CVE-2021-23841.md) | High | edk2-aarch64: EDK (Embedded Development Kit) is a project to enable UEFI support for Virtual Machines | 7.5 | 0.0741 |  |

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Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo