Find real vulnerabilities before they ship
An issue was discovered in the Linux kernel through 4.17.2. vbg_misc_device_ioctl() in drivers/virt/vboxguest/vboxguest_linux.c reads the same user data twice with copy_from_user. The header part of the user data is double-fetched, and a malicious user thread can tamper with the critical variables (hdr.size_in and hdr.size_out) in the header between the two fetches because of a race condition, leading to severe kernel errors, such as buffer over-accesses. This bug can cause a local denial of service and information leakage.
Base Score
6.3
| Base Score | 6.3 |
|---|---|
| Vector String | CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H |
| Base Severity | Medium |
| Version | 3.0 |
| Attack Vector (AV) | LOCAL |
