Security readout for executives and security teams
Plain-English summary
This issue can let a local application crash an illumos-based system by racing threaded sendmsg activity on one socket. The clearest named exposure is OmniOS Community Edition before r151030y. The business impact is availability: affected hosts may panic or become unavailable until recovered.
Executive priority
Treat this as a targeted availability risk for affected illumos or OmniOS infrastructure. It is not documented as actively exploited in the supplied sources, but systems that host untrusted code or critical services should be remediated promptly.
Technical view
The flaw is in illumos uts/common/inet/ip/ip_attr.c. Concurrent sendmsg calls from multiple threads over a single socket can trigger mishandled conn_ixa dereferences, leading to a kernel crash. Public metadata does not provide CVSS, CWE, remote reachability, privilege requirements, or confirmed exploit activity.
Likely exposure
Organizations running illumos, specifically OmniOS Community Edition before r151030y, are the likely exposed population. Evidence does not identify other distributions or products, so broader illumos exposure should be verified against vendor advisories.
Exploitation context
The source bundle describes a crash condition caused by an application with multiple threads using sendmsg concurrently on one socket. CISA KEV is false, and the provided sources do not claim active exploitation or public weaponization.
Researcher notes
Key gaps are missing CVSS, CWE, precise affected CPEs, and exploitability constraints. The record supports a kernel denial-of-service condition tied to conn_ixa dereference handling, but not broader impact such as privilege escalation or remote exploitation.
Mitigation direction
- Upgrade OmniOS Community Edition systems to r151030y or later where applicable.
- Check illumos and OmniOS guidance for the specific fix status.
- Restrict untrusted local workloads on affected hosts until remediated.
- Prioritize availability-critical systems that run multi-tenant or untrusted applications.
Validation and detection
- Inventory OmniOS CE and illumos hosts and record exact release levels.
- Flag OmniOS CE systems older than r151030y for remediation review.
- Confirm the installed kernel includes the illumos issue 11556 fix.
- Review crash or panic logs for related socket or ip_attr failures.
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-2019-19396 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://omniosce.org/article/030y-028ay-022dw.htmlCVE reference · x_refsource_MISC
- https://www.illumos.org/issues/11556CVE 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.