Bug 2464460 (CVE-2026-43032)

Summary: CVE-2026-43032 kernel: NFC: pn533: bound the UART receive buffer
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Near Field Communication (NFC) pn533 driver. A local attacker could exploit this vulnerability by sending a continuous stream of malformed Universal Asynchronous Receiver-Transmitter (UART) traffic. This improper handling of incoming data leads to an unbounded growth of the receive buffer, which can exhaust system memory and result in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-05-01 15:08:03 UTC 
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.
Comment 1 Keith Grant 2026-05-01 17:33:23 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026050101-CVE-2026-43032-a377@gregkh/T