PT-2018-11297 · Linux+1 · Linux Kernel+1

Pengfei Wang · Published 2018-06-22 · Updated 2019-03-14 · CVE-2018-12633

Positive Technologies (AI Summary)

CVSS v3.1

6.3

Medium

Base vector

AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 4.17.2

Description An issue in the Linux kernel allows a malicious user thread to tamper with critical variables due to a race condition, leading to severe kernel errors such as buffer over-accesses. This can cause a local denial of service and information leakage. The issue is related to the vbg misc device ioctl() function in drivers/virt/vboxguest/vboxguest linux.c, which reads user data twice with copy from user, allowing the header part of the user data to be double-fetched.

Recommendations For Linux kernel versions prior to 4.17.2, update to version 4.17.2 or later to resolve the issue. As a temporary workaround, consider restricting access to the vbg misc device ioctl() function to minimize the risk of exploitation.

Fix

DoS

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

ALT-PU-2018-1971

ALT-PU-2018-1976

ALT-PU-2019-1433

CVE-2018-12633

Affected Products

Alt Linux

Linux Kernel

References · 10

• https://github.com/torvalds/linux/commit/bd23a7269834dc7c1f93e83535d16ebc44b75eba · Patch
• https://cve.org/CVERecord?id=CVE-2018-12633 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2018-12633 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2018-12633 · Vendor Advisory
• http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=bd23a7269834dc7c1f93e83535d16ebc44b75eba · Vendor Advisory
• https://ubuntu.com/security/CVE-2018-12633 · Vendor Advisory
• https://bugzilla.kernel.org/show_bug.cgi?id=200131 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2018-12633 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2018-12633 · Security Note
• https://osv.dev/vulnerability/CVE-2018-12633 · Vendor Advisory