CVE-2019-15890

libslirp versión 4.0.0, como es usado en QEMU versión 4.1.0, presenta un uso de la memoria previamente liberada en la función ip_reass en el archivo ip_input.c.

A use-after-free issue was found in the SLiRP networking implementation of the QEMU emulator. The issue occurs in ip_reass() routine while reassembling incoming packets, if the first fragment is bigger than the m->m_dat[] buffer. A user or process could use this flaw to crash the QEMU process on the host, resulting in a denial of service.

It was discovered that the LSI SCSI adapter emulator implementation in QEMU did not properly validate executed scripts. A local attacker could use this to cause a denial of service. Sergej Schumilo, Cornelius Aschermann and Simon Woerner discovered that the qxl paravirtual graphics driver implementation in QEMU contained a null pointer dereference. A local attacker in a guest could use this to cause a denial of service. Various other issues were also addressed.