# CVE-2021-3739: kernel-uek: btrfs: fix NULL pointer dereference when deleting device by invalid id (Qu Wenruo) [Orabug: 33281078]

CVE-2021-3739 is fixed in 12 products on 1 platform, first by ELSA-2021-9457, released September 22, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-3739
- Priority: High
- CVSS: 7.1 (IMPORTANT)
- EPSS: 0.0062
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 22, 2021

## Description

btrfs: fix NULL pointer dereference when deleting device by invalid id (Qu Wenruo) [Orabug: 33281078]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | kernel-uek ol 8 | 0:5.4.17-2102.205.7.3.el8uek | [ELSA-2021-9457](https://patchblox.com/security/data/fix/linux/elsa-2021-9457.md) | Sep 22, 2021 |
| Linux | kernel-uek-container ol 8 | 0:5.4.17-2102.205.7.3.el8 | [ELSA-2021-9461](https://patchblox.com/security/data/fix/linux/elsa-2021-9461.md) | Sep 22, 2021 |
| Linux | kernel-uek-container-debug ol 8 | 0:5.4.17-2102.205.7.3.el8 | [ELSA-2021-9461](https://patchblox.com/security/data/fix/linux/elsa-2021-9461.md) | Sep 22, 2021 |
| Linux | kernel-uek-debug ol 8 | 0:5.4.17-2102.205.7.3.el8uek | [ELSA-2021-9457](https://patchblox.com/security/data/fix/linux/elsa-2021-9457.md) | Sep 22, 2021 |
| Linux | kernel-uek-debug-devel ol 8 | 0:5.4.17-2102.205.7.3.el8uek | [ELSA-2021-9457](https://patchblox.com/security/data/fix/linux/elsa-2021-9457.md) | Sep 22, 2021 |
| Linux | kernel-uek-devel ol 8 | 0:5.4.17-2102.205.7.3.el8uek | [ELSA-2021-9457](https://patchblox.com/security/data/fix/linux/elsa-2021-9457.md) | Sep 22, 2021 |
| Linux | kernel-uek-doc ol 8 | 0:5.4.17-2102.205.7.3.el8uek | [ELSA-2021-9457](https://patchblox.com/security/data/fix/linux/elsa-2021-9457.md) | Sep 22, 2021 |
| Linux | kernel-uek-tools ol 8 | 0:5.4.17-2102.205.7.3.el7uek | [ELSA-2021-9457](https://patchblox.com/security/data/fix/linux/elsa-2021-9457.md) | Sep 22, 2021 |
| Linux | kernel-uek-tools-libs ol 8 | 0:5.4.17-2102.205.7.3.el7uek | [ELSA-2021-9457](https://patchblox.com/security/data/fix/linux/elsa-2021-9457.md) | Sep 22, 2021 |
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-3739](https://patchblox.com/security/data/fix/linux/debian-cve-2021-3739.md) | Mar 10, 2022 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-3739](https://patchblox.com/security/data/fix/linux/debian-cve-2021-3739.md) | Mar 10, 2022 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-3739](https://patchblox.com/security/data/fix/linux/debian-cve-2021-3739.md) | Mar 10, 2022 |
| Linux | perf ol 8 | 0:5.4.17-2102.205.7.3.el7uek | [ELSA-2021-9457](https://patchblox.com/security/data/fix/linux/elsa-2021-9457.md) | Sep 22, 2021 |
| Linux | python-perf ol 8 | 0:5.4.17-2102.205.7.3.el7uek | [ELSA-2021-9457](https://patchblox.com/security/data/fix/linux/elsa-2021-9457.md) | Sep 22, 2021 |

---

Data as of 2026-11-11T13:47:35Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.