Security readout for executives and security teams
Plain-English summary
CVE-2023-3567 is a Linux kernel memory safety flaw. A local user could trigger a crash or expose internal kernel information. The business risk is highest on shared Linux systems, virtualization hosts, and workloads where untrusted users can obtain shell or process-level access.
Executive priority
Treat this as a high-priority local privilege-adjacent kernel risk. It is less urgent than a remote unauthenticated flaw, but it can materially affect confidentiality and availability on systems where users, tenants, containers, or services may run local code.
Technical view
The flaw is a use-after-free in vcs_read in drivers/tty/vt/vc_screen.c, caused by a race in the Linux kernel virtual console screen path. Red Hat lists affected kernel and kernel-rt packages across RHEL 8, RHEL 9, EUS streams, and Red Hat Virtualization-related builds.
Likely exposure
Exposure is primarily local, not remotely reachable by itself. Systems running the affected Red Hat kernel or kernel-rt package versions are the clearest targets. RHEL 6 is listed as unaffected; RHEL 7 status is unknown in the provided data.
Exploitation context
The source bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates local access, low attack complexity, low privileges, no user interaction, high confidentiality impact, and high availability impact.
Researcher notes
Focus assessment on access paths to the virtual console screen code and package lineage. The public bundle identifies the vulnerable function and race class but does not provide exploit maturity, proof-of-concept status, or complete fixed-version mapping beyond Red Hat advisory references.
Mitigation direction
- Apply the relevant Red Hat security advisory updates for affected kernel or kernel-rt packages.
- Prioritize multi-user servers, virtualization hosts, and systems with untrusted local users.
- Check Red Hat guidance for exact fixed package versions before scheduling changes.
- Reboot into the updated kernel where vendor update procedures require it.
- Document exceptions for systems that cannot be updated promptly.
Validation and detection
- Inventory RHEL kernel and kernel-rt package versions across servers and images.
- Compare installed versions against the affected versions in the Red Hat CVE record.
- Confirm whether each system maps to affected RHEL, EUS, realtime, NFV, or virtualization channels.
- Verify patched systems are running the updated kernel after maintenance.
- Track RHEL 7 separately because the provided status is unknown.
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.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2023-3567 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
- High
- CVSS
- 7.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H1.85.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2024:0412CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:0431CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:0432CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:0439CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:0448CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:0575CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:2394CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:2950CVE reference · vendor-advisory, x_refsource_REDHAT
- RHSA-2024:3138CVE reference · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2023-3567CVE reference · vdb-entry, x_refsource_REDHAT
- RHBZ#2221463CVE reference · issue-tracking, x_refsource_REDHAT
- https://www.spinics.net/lists/stable-commits/msg285184.htmlCVE reference
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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.