The (1) fw_cfg_write and (2) fw_cfg_read functions in hw/nvram/fw_cfg.c in QEMU before 2.4, when built with the Firmware Configuration device emulation support, allow guest OS users with the CAP_SYS_RAWIO privilege to cause a denial of service (out-of-bounds read or write access and process crash) or possibly execute arbitrary code via an invalid current entry value in a firmware configuration.
Exploitability
AV:LAC:HPR:NUI:NScope
S:CImpact
C:HI:HA:H8.1/CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H