Vulnerability Details : CVE-2018-12633
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.
Vulnerability category: Denial of service
Products affected by CVE-2018-12633
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2018-12633
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 6 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2018-12633
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
6.3
|
MEDIUM | AV:L/AC:M/Au:N/C:C/I:N/A:C |
3.4
|
9.2
|
NIST | |
|
6.3
|
MEDIUM | CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H |
1.0
|
5.2
|
NIST |
CWE ids for CVE-2018-12633
-
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.Assigned by: nvd@nist.gov (Primary)
References for CVE-2018-12633
-
https://github.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75eba
virt: vbox: Only copy_from_user the request-header once · torvalds/linux@bd23a72 · GitHubPatch;Third Party Advisory
-
https://bugzilla.kernel.org/show_bug.cgi?id=200131
200131 – Double-Fetch bug in Linux-4.16.8/drivers/virt/vboxguest/vboxguest_linux.c.Issue Tracking;Vendor Advisory
-
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7269834dc7c1f93e83535d16ebc44b75eba
kernel/git/torvalds/linux.git - Linux kernel source treePatch;Vendor Advisory
Jump to