# CVE-2021-4202: linux: A use-after-free flaw was found in nci_request in net/nfc/nci/core.c in NFC Controller Interface (NCI) in the Linux k...

CVE-2021-4202 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-4202, released March 25, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-4202
- Priority: High
- CVSS: 7.0 (high)
- EPSS: 0.0037
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 25, 2022

## Description

A use-after-free flaw was found in nci_request in net/nfc/nci/core.c in NFC Controller Interface (NCI) in the Linux kernel. This flaw could allow a local attacker with user privileges to cause a data race problem while the device is getting removed, leading to a privilege escalation problem.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.5-1 | [DEBIAN-CVE-2021-4202](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4202.md) | Mar 25, 2022 |
| Linux | linux Debian 13.5 (trixie) | 5.15.5-1 | [DEBIAN-CVE-2021-4202](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4202.md) | Mar 25, 2022 |
| Linux | linux Debian 14 | 5.15.5-1 | [DEBIAN-CVE-2021-4202](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4202.md) | Mar 25, 2022 |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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