What is CVE-2018-18955?

CVE-2018-18955 is a High severity Linux kernel vulnerability with a CVSS score of 7.0 out of 10. CVE-2018-18955 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2018-18955?

CVE-2018-18955 has a CVSS score of 7.0 out of 10, rated High severity. The vector string is CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2018-18955?

No patch is currently available for CVE-2018-18955. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2018-18955 actively exploited?

CVE-2018-18955 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2018-18955

High

In the Linux kernel 4.15.x through 4.19.x before 4.19.2, map_write() in kernel/user_namespace.c allows privilege escalation because it mishandles nested user namespaces with more than 5 UID or GID ranges. A user who has CAP_SYS_ADMIN in an affected user namespace can bypass access controls on resources outside the namespace, as demonstrated by reading /etc/shadow. This occurs because an ID transformation takes place properly for the namespaced-to-kernel direction but not for the kernel-to-namespaced direction.

Package Linux Kernel

Published 2018-11-16

Last modified 2024-11-21

CVSS version 3.0

Patch available

Awaiting data

CVSS 3.0 score

7.0

out of 10

High

Attack Vector

Local

Attack Complexity

High

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-863

CVE-2018-18955 is classified as CWE-863

See CWE-863 on MITRE CWE for full details on this weakness type.

References

The following references provide additional information about CVE-2018-18955 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Securityfocus
http://www.securityfocus.com/bid/105941

Third Party Advisory VDB Entry
Security
https://security.netapp.com/advisory/ntap-20190416-0003/
Support
https://support.f5.com/csp/article/K39103040
Ubuntu Security
https://usn.ubuntu.com/3832-1/

Third Party Advisory
Ubuntu Security
https://usn.ubuntu.com/3833-1/

Third Party Advisory
Ubuntu Security
https://usn.ubuntu.com/3835-1/

Third Party Advisory
Ubuntu Security
https://usn.ubuntu.com/3836-1/

Third Party Advisory
Ubuntu Security
https://usn.ubuntu.com/3836-2/

Third Party Advisory
Exploit-DB
https://www.exploit-db.com/exploits/45915/

Exploit Third Party Advisory VDB Entry
Kernel patch commit
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2f007dbe7e4c9583eea6eb04d60001e85c6f1bd
Patch
Kernel patch commit
https://bugs.chromium.org/p/project-zero/issues/detail?id=1712
Patch
Kernel patch commit
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.19
Patch

6 patch commits total View all on NVD

Details

CVE ID CVE-2018-18955

Severity High

CVSS score 7.0 / 10

CVSS version 3.0

Published 2018-11-16

Modified 2024-11-21

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2018-18955?

CVE-2018-18955 is a High severity Linux kernel vulnerability with a CVSS score of 7.0 out of 10 . CVE-2018-18955 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2018-18955?

CVE-2018-18955 has a CVSS score of 7.0 out of 10, rated High severity (CVSS 3.0). The vector string is CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2018-18955?

No patch is currently available for CVE-2018-18955. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2018-18955 actively exploited?

No — CVE-2018-18955 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.