# CVE-2021-39714: linux: In ion_buffer_kmap_get of ion.c, there is a possible use-after-free due to an integer overflow

CVE-2021-39714 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-39714, released March 16, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-39714
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 16, 2022

## Description

In ion_buffer_kmap_get of ion.c, there is a possible use-after-free due to an integer overflow. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-205573273References: Upstream kernel

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 4.12.6-1 | [DEBIAN-CVE-2021-39714](https://patchblox.com/security/data/fix/linux/debian-cve-2021-39714.md) | Mar 16, 2022 |
| Linux | linux Debian 13.5 (trixie) | 4.12.6-1 | [DEBIAN-CVE-2021-39714](https://patchblox.com/security/data/fix/linux/debian-cve-2021-39714.md) | Mar 16, 2022 |
| Linux | linux Debian 14 | 4.12.6-1 | [DEBIAN-CVE-2021-39714](https://patchblox.com/security/data/fix/linux/debian-cve-2021-39714.md) | Mar 16, 2022 |

---

Data as of 2026-11-08T06:59:42Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo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.