Security readout for executives and security teams
Plain-English summary
CVE-2018-6925 is a FreeBSD kernel denial-of-service issue. A logged-in local user without privileges may be able to crash the system because IPv6 socket state is mishandled on certain error paths. Business impact is service interruption, not data theft, based on the supplied evidence.
Executive priority
Treat as a timely availability fix for affected FreeBSD systems. It is not evidenced as remotely exploitable or actively exploited here, but local-user crash risk can disrupt critical infrastructure.
Technical view
Affected FreeBSD releases before the named patch levels improperly maintain IPv6 protocol control block flags through failure paths. This can lead to a NULL pointer dereference in kernel context and a system crash triggered by an unprivileged authenticated local user.
Likely exposure
Exposure is most relevant for FreeBSD 10.4, 11.1, and 11.2 systems below the fixed patch levels, especially multi-user systems, shared hosting, bastions, or appliances where non-admin local access exists.
Exploitation context
The supplied sources do not show CISA KEV listing or active exploitation. The prerequisite is authenticated local access, which lowers broad internet exposure but still matters where untrusted users can log in.
Researcher notes
No CVSS vector or CWE is provided in the bundle. Analysis is limited to the official FreeBSD advisory references and CVE description. Do not assume confidentiality or integrity impact without additional vendor evidence.
Mitigation direction
- Upgrade FreeBSD 11.2 systems to 11.2-RELEASE-p4 or later.
- Upgrade FreeBSD 11.1 systems to 11.1-RELEASE-p15 or later.
- Upgrade FreeBSD 10.4 systems to 10.4-RELEASE-p13 or later.
- For STABLE branches, use revisions r338986 or r338985 as applicable.
- Prioritize systems with local users who are not fully trusted.
Validation and detection
- Inventory FreeBSD hosts and record release and patch level.
- Compare versions against the fixed releases named in FreeBSD-EN-18:11.listen.
- Identify systems offering shell, SSH, hosting, or other local-user access.
- Confirm patched hosts no longer run affected release levels.
- Review outage logs for unexplained kernel crashes on affected systems.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2018-6925 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://security.freebsd.org/advisories/FreeBSD-EN-18:11.listen.ascCVE reference · x_refsource_CONFIRM
- https://www.flexera.com/company/secunia-research/advisories/SR-2018-21.htmlCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.