CVE Intelligence
High Privilege escalation exploit reference

CVE-2018-13405 — The inode_init_owner function in fs/inode.c in the Linux kernel through 3.16 allows local users...

The inode_init_owner function in fs/inode.c in the Linux kernel through 3.16 allows local users to create files with an unintended group ownership, in a scenario where a directory is SGID to a certain group and is writable by a user who is not a member of that group. Here, the non-member can trigger creation of a plain file whose group ownership is that group. The intended behavior was that the non-member can trigger creation of a directory (but not a plain file) whose group ownership is that group. The non-member can escalate privileges by making the plain file executable and SGID.

Published Jul 6, 2018 · Updated Oct 14, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: mitre

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

Exploit-DB · 1
How the score was calculated
  • Public exploit/PoC (exploitdb)+8
  • EPSS 1% (30-day exploitation probability)+9
  • Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
1.04%
ahead of 63% of scored CVEs · Oct 14, 2026
Affects
Canonical
Ubuntu Linux and 26 more
CVSS base
7.8
High · 2 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — openwall.com (NIST National Vulnerability Database)
  • Documented patch — git.kernel.org (NIST National Vulnerability Database)
  • Documented patch — github.com (NIST National Vulnerability Database)

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Canonical Ubuntu Linux, Debian Debian Linux, F5 Big-ip Access Policy Manager…).
  2. Apply the fixed version or the patch documented under Remediation.
  3. Search available logs for exploit probes matching the vulnerability class (privilege escalation), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Canonical Ubuntu Linux version 14.04version 16.04version 18.04 Vulnerable NIST National Vulnerability Database
Debian Debian Linux version 8.0version 9.0 Vulnerable NIST National Vulnerability Database
F5 Big-ip Access Policy Manager ≥ 13.0.0 and < 13.1.3.5≥ 14.0.0 and < 14.1.3.1≥ 15.0.0 and < 15.0.1.4version 15.1.0version 16.0.0 Vulnerable NIST National Vulnerability Database
F5 Big-ip Advanced Firewall Manager version 16.0.0version 15.1.0≥ 15.0.0 and < 15.0.1.4≥ 14.0.0 and < 14.1.3.1≥ 13.0.0 and < 13.1.3.5 Vulnerable NIST National Vulnerability Database
F5 Big-ip Analytics version 15.1.0version 16.0.0≥ 13.0.0 and < 13.1.3.5≥ 15.0.0 and < 15.0.1.4≥ 14.0.0 and < 14.1.3.1 Vulnerable NIST National Vulnerability Database
F5 Big-ip Application Acceleration Manager version 16.0.0≥ 13.0.0 and < 13.1.3.5≥ 15.0.0 and < 15.0.1.4version 15.1.0≥ 14.0.0 and < 14.1.3.1 Vulnerable NIST National Vulnerability Database
F5 Big-ip Application Security Manager version 16.0.0version 15.1.0≥ 15.0.0 and < 15.0.1.4≥ 14.0.0 and < 14.1.3.1≥ 13.0.0 and < 13.1.3.5 Vulnerable NIST National Vulnerability Database
F5 Big-ip Domain Name System ≥ 15.0.0 and < 15.0.1.4version 16.0.0version 15.1.0≥ 14.0.0 and < 14.1.3.1≥ 13.0.0 and < 13.1.3.5 Vulnerable NIST National Vulnerability Database
F5 Big-ip Edge Gateway ≥ 14.0.0 and < 14.1.3.1≥ 15.0.0 and < 15.0.1.4version 16.0.0≥ 13.0.0 and < 13.1.3.5version 15.1.0 Vulnerable NIST National Vulnerability Database
F5 Big-ip Fraud Protection Service ≥ 13.0.0 and < 13.1.3.5≥ 14.0.0 and < 14.1.3.1≥ 15.0.0 and < 15.0.1.4version 15.1.0version 16.0.0 Vulnerable NIST National Vulnerability Database
F5 Big-ip Global Traffic Manager ≥ 13.0.0 and < 13.1.3.5≥ 14.0.0 and < 14.1.3.1≥ 15.0.0 and < 15.0.1.4version 15.1.0version 16.0.0 Vulnerable NIST National Vulnerability Database
F5 Big-ip Link Controller ≥ 15.0.0 and < 15.0.1.4version 16.0.0version 15.1.0≥ 14.0.0 and < 14.1.3.1≥ 13.0.0 and < 13.1.3.5 Vulnerable NIST National Vulnerability Database
F5 Big-ip Local Traffic Manager ≥ 14.0.0 and < 14.1.3.1≥ 15.0.0 and < 15.0.1.4version 16.0.0≥ 13.0.0 and < 13.1.3.5version 15.1.0 Vulnerable NIST National Vulnerability Database
F5 Big-ip Policy Enforcement Manager version 16.0.0version 15.1.0≥ 15.0.0 and < 15.0.1.4≥ 14.0.0 and < 14.1.3.1≥ 13.0.0 and < 13.1.3.5 Vulnerable NIST National Vulnerability Database
F5 Big-ip Webaccelerator version 16.0.0version 15.1.0≥ 15.0.0 and < 15.0.1.4≥ 14.0.0 and < 14.1.3.1≥ 13.0.0 and < 13.1.3.5 Vulnerable NIST National Vulnerability Database
Fedoraproject Fedora version 35version 34 Vulnerable NIST National Vulnerability Database
Linux Linux Kernel ≤ 3.16 Vulnerable NIST National Vulnerability Database
Red Hat Enterprise Linux Aus version 7.4 Vulnerable NIST National Vulnerability Database
Red Hat Enterprise Linux Desktop version 6.0version 7.0 Vulnerable NIST National Vulnerability Database
Red Hat Enterprise Linux Eus version 7.5version 7.4 Vulnerable NIST National Vulnerability Database
Red Hat Enterprise Linux For Real Time version 7 Vulnerable NIST National Vulnerability Database
Red Hat Enterprise Linux Server version 7.0version 6.0 Vulnerable NIST National Vulnerability Database
Red Hat Enterprise Linux Server Aus version 7.3version 7.2version 6.6 Vulnerable NIST National Vulnerability Database
Red Hat Enterprise Linux Server Tus version 7.2version 7.4version 7.3 Vulnerable NIST National Vulnerability Database
Red Hat Enterprise Linux Workstation version 7.0version 6.0 Vulnerable NIST National Vulnerability Database
Red Hat Mrg Realtime version 2.0 Vulnerable NIST National Vulnerability Database
Red Hat Virtualization version 4.0 Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
7.8 CVSS 3.1 High 1.8 5.9 nvd@nist.gov via NIST National Vulnerability Database
7.8 CVSS 3.1 High — — GitHub, Inc. via GitHub Security Advisories
4.6 CVSS 2.0 Medium 3.9 6.4 nvd@nist.gov via NIST National Vulnerability Database
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-269 · Improper Privilege Management

Other CVEs with this weakness →

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Exploit-DB

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 1.04%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

  • 2026
  • Record published
    Oct 14, 2026
  • Fix documented
    Oct 14, 2026 · NIST National Vulnerability Database
  • Affected products added · linux/linux kernel, debian/debian linux, canonical/ubuntu linux, fedoraproject/fedora, redhat/mrg realtime, redhat/virtu
    Oct 14, 2026 · NIST National Vulnerability Database
  • CVSS changed · 7.8
    Oct 14, 2026 · NIST National Vulnerability Database
  • Source status changed · → Modified
    Oct 14, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 14, 2026 · Alertas do Telegram
  • 2018
  • CVE published
    Jul 6, 2018 · mitre

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 14, 2026 – Oct 14, 2026
  • 1× Official description updated · Oct 14, 2026 – Oct 14, 2026

References

32 on the record

Elsewhere on this site

Canonical
every CVE for this vendor
Privilege escalation
same class
CWE-269
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-94127 F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability KEV 23d
  • CVE-2026-63020 A vulnerability exists in an undisclosed BIG-IP Configuration utility page that may… Sep 2, 2026
  • CVE-2026-42169 Gimp: gimp apng loader heap-buffer-overflow when fctl width exceeds ihdr width (file-png.c) Aug 4, 2026
  • CVE-2026-12996 A use-after-free in OpenVPN 2.6.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows remote... Jul 30, 2026
  • CVE-2026-14355 ext/openssl: Memory corruption in openssl_encrypt with AES-WRAP-PAD Jul 3, 2026
  • CVE-2026-56968 Use of Uninitialized Resource in Gnu Sasl Jun 23, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No CISA SSVC assessment.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2018-13405 is "The inode_init_owner function in fs/inode.c in the Linux kernel through 3.16 allows local users...", rated High. It affects Ubuntu Linux (Canonical); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.8 describes technical severity. EPSS 1.04% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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