What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-01 · updated 2026-06-17

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.

Affected products

• Linux kernel: from 5.5 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.168; from 6.2 before 6.6.134; from 6.7 before 6.12.81; from 6.13 before 6.18.22 — fixed in 5.10.253, 5.15.203, 6.1.168, 6.12.81, 6.18.22, 6.19.12

How to fix

Upgrade to a fixed version: Linux kernel 5.10.253, 5.15.203, 6.1.168, 6.12.81. Check the vendor advisory for mitigations.

References

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

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