Vulnerability Description
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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | <= 4.17.2 |
Related Weaknesses (CWE)
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7PatchVendor Advisory
- https://bugzilla.kernel.org/show_bug.cgi?id=200131Issue TrackingVendor Advisory
- https://github.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75ebPatchThird Party Advisory
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7PatchVendor Advisory
- https://bugzilla.kernel.org/show_bug.cgi?id=200131Issue TrackingVendor Advisory
- https://github.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75ebPatchThird Party Advisory
FAQ
What is CVE-2018-12633?
CVE-2018-12633 is a vulnerability with a CVSS score of 6.3 (MEDIUM). 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 t...
How severe is CVE-2018-12633?
CVE-2018-12633 has been rated MEDIUM with a CVSS base score of 6.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-12633?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.