CVE-2018-1000200 — MEDIUM (5.5)

Vulnerability Description

The Linux Kernel versions 4.14, 4.15, and 4.16 has a null pointer dereference which can result in an out of memory (OOM) killing of large mlocked processes. The issue arises from an oom killed process's final thread calling exit_mmap(), which calls munlock_vma_pages_all() for mlocked vmas.This can happen synchronously with the oom reaper's unmap_page_range() since the vma's VM_LOCKED bit is cleared before munlocking (to determine if any other vmas share the memory and are mlocked).

CVSS Score

5.5

MEDIUM

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Linux	Linux Kernel	4.14

Related Weaknesses (CWE)

CWE-476

References

http://seclists.org/oss-sec/2018/q2/67Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/104397Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:2948
https://access.redhat.com/security/cve/cve-2018-1000200Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=27MitigationPatchVendor Advisory
https://marc.info/?l=linux-kernel&m=152400522806945Mailing ListThird Party Advisory
https://marc.info/?l=linux-kernel&m=152460926619256Mailing ListThird Party Advisory
https://usn.ubuntu.com/3752-1/
https://usn.ubuntu.com/3752-2/
https://usn.ubuntu.com/3752-3/
http://seclists.org/oss-sec/2018/q2/67Mailing ListThird Party Advisory
http://www.securityfocus.com/bid/104397Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2018:2948
https://access.redhat.com/security/cve/cve-2018-1000200Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=27MitigationPatchVendor Advisory

FAQ

What is CVE-2018-1000200?

CVE-2018-1000200 is a vulnerability with a CVSS score of 5.5 (MEDIUM). The Linux Kernel versions 4.14, 4.15, and 4.16 has a null pointer dereference which can result in an out of memory (OOM) killing of large mlocked processes. The issue arises from an oom killed process...

How severe is CVE-2018-1000200?

CVE-2018-1000200 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2018-1000200?

Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.