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Date: Wed, 17 Oct 2018 12:59:01 +0530 (IST)
From: P J P <>
To: oss security list <>
cc: Arash TC <>
Subject: CVE-2018-18438 Qemu: Integer overflow in ccid_card_vscard_read()
 allows memory corruption


An integer overflow issue was found in the CCID Passthru card device 
emulation, while reading card data in ccid_card_vscard_read() function. The 
ccid_card_vscard_read() function accepts a signed integer 'size' argument, 
which is subsequently used as unsigned size_t value in memcpy(), copying large 
amounts of memory.

A user inside guest could use this flaw to crash the Qemu process resulting in 

Upstream patch:

This issue was reported by Arash Tohidi. CVE requested via ->

Thank you.
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F

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