A flaw was found in the QXL display device emulation in QEMU. An integer overflow in the cursor_alloc() function can lead to the allocation of a small cursor object followed by a subsequent heap-based buffer overflow. This flaw allows a malicious privileged guest user to crash the QEMU process on the host or potentially execute arbitrary code within the context of the QEMU process.
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.
| Link | Tags |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=2036998 | issue tracking third party advisory |
| https://starlabs.sg/advisories/21-4206/ | third party advisory exploit |
| https://www.debian.org/security/2022/dsa-5133 | third party advisory vendor advisory |
| https://security.gentoo.org/glsa/202208-27 | third party advisory vendor advisory |
| https://lists.debian.org/debian-lts-announce/2022/09/msg00008.html | third party advisory mailing list |
| https://security.netapp.com/advisory/ntap-20250321-0010/ |