Ubuntu.comUB:CVE-2018-1000200CVE-2018-1000200
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.9 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
0.001 Low
EPSS
Percentile
25.6%
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).
Notes
| Author | Note |
|---|---|
| tyhicks | Proposed fix (v2): https://marc.info/?l=linux-kernel&m=152401997210084&w=2 Proposed fix (v3): https://marc.info/?l=linux-kernel&m=152460926619256 |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 18.04 | noarch | linux | < 4.15.0-33.36 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-aws | < 4.15.0-1020.20 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-azure | < 4.15.0-1022.23 | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-azure | < 4.15.0-1022.22~16.04.1 | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-azure-edge | < 4.15.0-1022.23 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-gcp | < 4.15.0-1018.19 | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-gcp | < 4.15.0-1018.19~16.04.2 | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-hwe | < 4.15.0-33.36~16.04.1 | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-hwe-edge | < 4.15.0-33.36~16.04.1 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-kvm | < 4.15.0-1020.20 | UNKNOWN |
References
openwall.com/lists/oss-security/2018/04/24/3
launchpad.net/bugs/cve/CVE-2018-1000200
nvd.nist.gov/vuln/detail/CVE-2018-1000200
security-tracker.debian.org/tracker/CVE-2018-1000200
ubuntu.com/security/notices/USN-3752-1
ubuntu.com/security/notices/USN-3752-2
ubuntu.com/security/notices/USN-3752-3
www.cve.org/CVERecord?id=CVE-2018-1000200
Related
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.9 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:N/I:N/A:C
0.001 Low
EPSS
Percentile
25.6%