CVE-2026-43098
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Buffer Overflow in Linux Kernel NFC Subsystem

Publication date: 2026-05-06

Last updated on: 2026-06-01

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: nfc: s3fwrn5: allocate rx skb before consuming bytes s3fwrn82_uart_read() reports the number of accepted bytes to the serdev core. The current code consumes bytes into recv_skb and may already deliver a complete frame before allocating a fresh receive buffer. If that alloc_skb() fails, the callback returns 0 even though it has already consumed bytes, and it leaves recv_skb as NULL for the next receive callback. That breaks the receive_buf() accounting contract and can also lead to a NULL dereference on the next skb_put_u8(). Allocate the receive skb lazily before consuming the next byte instead. If allocation fails, return the number of bytes already accepted.
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Meta Information
Published
2026-05-06
Last Modified
2026-06-01
Generated
2026-06-16
AI Q&A
2026-05-06
EPSS Evaluated
2026-06-15
NVD
CVE-2026-43098
EUVD
EUVD-2026-27607
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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Executive Summary

This vulnerability exists in the Linux kernel's NFC driver for the s3fwrn5 device. The issue arises because the code consumes bytes into a receive buffer (recv_skb) before allocating a new buffer for incoming data. If the allocation of this buffer fails, the function incorrectly returns 0 despite having consumed bytes, leaving the receive buffer pointer as NULL. This breaks the expected behavior of the receive buffer management and can lead to a NULL pointer dereference in subsequent operations.

Impact Analysis

The vulnerability can cause a NULL pointer dereference in the Linux kernel NFC driver, which may lead to a kernel crash or system instability. This can affect the reliability and availability of systems using the affected NFC driver, potentially causing denial of service conditions.

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