Security readout for executives and security teams
Plain-English summary
This is a gVisor sandbox flaw that could let an attacker corrupt memory in root-running processes inside the sandbox. The source explicitly says it does not allow escaping the sandbox. Business urgency depends on whether old gVisor builds from before 2018-11-01 are still deployed.
Executive priority
Treat as a targeted cleanup item for legacy gVisor deployments. It is not sourced as a sandbox escape or actively exploited issue, but old sandbox infrastructure running untrusted code should be upgraded promptly.
Technical view
The issue is in pkg/sentry/kernel/shm/shm.go before 2018-11-01. Mishandled reference counting around IPC_RMID shmctl calls could allow overwriting memory locations in processes running as root within gVisor. The cited fix is Google gVisor commit 0e277a39c8b6f905e289b75e8ad0594e6b3562ca.
Likely exposure
Exposure is limited to environments running Google gVisor builds before 2018-11-01, especially workloads using System V shared memory. The provided CVE metadata does not identify packaged product versions or CPEs.
Exploitation context
The bundle provides a public technical write-up and fix commit, but no KEV listing and no cited evidence of active exploitation. The vulnerability affects privilege and memory safety inside the sandbox, not sandbox escape.
Researcher notes
Focus review on SysV shared memory IPC_RMID handling and object lifetime/reference-counting behavior. Avoid assuming broader host compromise: the CVE description explicitly says the issue does not escape the sandbox.
Mitigation direction
- Inventory gVisor use and identify builds dated before 2018-11-01.
- Upgrade to a gVisor release containing commit 0e277a39 or later.
- Prioritize systems running untrusted workloads inside gVisor sandboxes.
- Check current Google gVisor guidance for supported release and backport details.
Validation and detection
- Confirm deployed gVisor build date or commit hash.
- Check whether pkg/sentry/kernel/shm/shm.go includes the referenced reference-counting fix.
- Review container workloads for System V shared memory usage.
- Verify no legacy pre-2018-11-01 gVisor images remain in production.
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-2018-19333 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://justi.cz/security/2018/11/14/gvisor-lpe.htmlCVE reference · x_refsource_MISC
- https://github.com/google/gvisor/commit/0e277a39c8b6f905e289b75e8ad0594e6b3562caCVE 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.