# ELSA-2021-9457: Security update for 9 packages

ELSA-2021-9457, released September 22, 2021, fixes 1 CVE across 9 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/elsa-2021-9457
- Platform: Linux
- Released: Sep 22, 2021
- Priority: High (Closes CVE-2021-3739, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://linux.oracle.com/errata/ELSA-2021-9457.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kernel-uek](https://patchblox.com/security/data/product/linux/kernel-uek.md) | ol 8 | 0:5.4.17-2102.205.7.3.el8uek |
| [kernel-uek-debug](https://patchblox.com/security/data/product/linux/kernel-uek-debug.md) | ol 8 | 0:5.4.17-2102.205.7.3.el8uek |
| [kernel-uek-debug-devel](https://patchblox.com/security/data/product/linux/kernel-uek-debug-devel.md) | ol 8 | 0:5.4.17-2102.205.7.3.el8uek |
| [kernel-uek-devel](https://patchblox.com/security/data/product/linux/kernel-uek-devel.md) | ol 8 | 0:5.4.17-2102.205.7.3.el8uek |
| [kernel-uek-doc](https://patchblox.com/security/data/product/linux/kernel-uek-doc.md) | ol 8 | 0:5.4.17-2102.205.7.3.el8uek |
| [kernel-uek-tools](https://patchblox.com/security/data/product/linux/kernel-uek-tools.md) | ol 8 | 0:5.4.17-2102.205.7.3.el7uek |
| [kernel-uek-tools-libs](https://patchblox.com/security/data/product/linux/kernel-uek-tools-libs.md) | ol 8 | 0:5.4.17-2102.205.7.3.el7uek |
| [perf](https://patchblox.com/security/data/product/linux/perf.md) | ol 8 | 0:5.4.17-2102.205.7.3.el7uek |
| [python-perf](https://patchblox.com/security/data/product/linux/python-perf.md) | ol 8 | 0:5.4.17-2102.205.7.3.el7uek |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-3739](https://patchblox.com/security/data/cve/CVE-2021-3739.md) | High | linux: A NULL pointer dereference flaw was found in the btrfs_rm_device function in fs/btrfs/volumes.c in the Linux Kernel,... | 7.1 | 0.0062 |  |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo