CVE-2018-16884
What it is
A flaw was found in the Linux kernel's NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel IDs and cause a use-after-free vulnerability. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.
At a glance
- Exploitability
- Can be exploited from the same network segment with a low-privilege account. High risk of data exposure, data tampering, service disruption.
- Exploit odds
- 1.5% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 1.5% in the next 30 days (EPSS).
- Severity: 8.0 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 1.5% · EPSS, next 30 days
- Weakness
- CWE-416 · Use after free
- Record status
- Modified
Affected
- Linux Kernel < 3.16.65
- Linux Kernel < 3.18.133
- Linux Kernel < 4.4.171
- Linux Kernel < 4.9.151
- Linux Kernel < 4.14.94
- Linux Kernel < 4.19.16
- Linux Kernel < 4.20.3
- Redhat Enterprise Linux 7.0
Attack profile CVSS 3.1 · 8.0
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Raw vector
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2018-16884.md and follow it. Check whether this project is affected by CVE-2018-16884. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16884
- https://patchwork.kernel.org/cover/10733767/
- https://patchwork.kernel.org/patch/10733769/
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16884
- https://patchwork.kernel.org/cover/10733767/
- https://patchwork.kernel.org/patch/10733769/
References
- http://www.securityfocus.com/bid/106253
- https://access.redhat.com/errata/RHSA-2019:1873
- https://access.redhat.com/errata/RHSA-2019:1891
- https://access.redhat.com/errata/RHSA-2019:2696
- https://access.redhat.com/errata/RHSA-2019:2730
- https://access.redhat.com/errata/RHSA-2019:3309
- https://access.redhat.com/errata/RHSA-2019:3517
- https://access.redhat.com/errata/RHSA-2020:0204
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16884
- https://lists.debian.org/debian-lts-announce/2019/03/msg00034.html
- https://lists.debian.org/debian-lts-announce/2019/04/msg00004.html
- https://lists.debian.org/debian-lts-announce/2019/05/msg00002.html
- https://patchwork.kernel.org/cover/10733767/
- https://patchwork.kernel.org/patch/10733769/
- https://support.f5.com/csp/article/K21430012
- https://usn.ubuntu.com/3932-1/
- https://usn.ubuntu.com/3932-2/
- https://usn.ubuntu.com/3980-1/
- https://usn.ubuntu.com/3980-2/
- https://usn.ubuntu.com/3981-1/
- https://usn.ubuntu.com/3981-2/
- https://www.oracle.com/security-alerts/cpuApr2021.html
- http://www.securityfocus.com/bid/106253
- https://access.redhat.com/errata/RHSA-2019:1873
- https://access.redhat.com/errata/RHSA-2019:1891