Security update for qemu

Open Source Vulnerabilities SUSE-SU-2026:21883-1

This update for qemu fixes the following issues - CVE-2025-14876: qemu-kvm: Unbounded allocation in virtio-crypto (bsc#1255400). - CVE-2026-0665: out-of-bounds heap access can lead to a denial of service or potential memory corruption (bsc#1256484). - CVE-2026-2243: incorrect bounds check leads to heap out-of-bounds read and a 12-byte information leak when processing specially crafted VMDK files (bsc#1258509). - CVE-2026-3195: heap buffer overflow when reading input audio in the virtio-snd device input callback due to insufficient checks in `virtio_snd_pcm_in_cb` (bsc#1259080). - CVE-2026-3196: integer overflow in the virtio-snd device via PCM_INFO requests from the guest leads to unbounded memory allocation and host denial-of-service (bsc#1259079). - CVE-2026-3842: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host OOB write (bsc#1262089).