Security readout for executives and security teams
Plain-English summary
CVE-2024-0639 is a Linux kernel denial-of-service issue in the SCTP networking subsystem. A local low-privileged user, including a guest user, may trigger a deadlock that can hang or crash the system. The business impact is availability loss, not data theft or privilege escalation based on the supplied sources.
Executive priority
Treat this as a moderate availability risk. It is not described as remotely exploitable, but affected shared Linux systems should be patched through normal kernel maintenance, with faster handling for business-critical or multi-tenant hosts.
Technical view
The flaw is a CWE-833 deadlock in sctp_auto_asconf_init within net/sctp/socket.c involving &net->sctp.addr_wq_lock. Red Hat rates it medium with CVSS 3.1 score 5.5: local attack vector, low complexity, low privileges, no user interaction, and high availability impact.
Likely exposure
Exposure is most relevant to Red Hat Enterprise Linux 9 kernel and kernel-rt systems listed as affected, including version 0:5.14.0-362.8.1.el9_3. RHEL 6, 7, and 8 entries in the bundle are marked unaffected.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires local low-privileged access, so risk is higher on shared, multi-user, virtualized, or workload-hosting systems where untrusted users can run code.
Researcher notes
Evidence points to a kernel SCTP deadlock fixed upstream in the referenced Linux commit. The bundle names Red Hat Enterprise Linux 9 as affected and several older Red Hat releases as unaffected. No exploit availability or weaponized technique is provided.
Mitigation direction
- Check Red Hat advisory RHSA-2023:6583 for applicable kernel updates.
- Apply vendor-provided kernel or kernel-rt fixes where available.
- Prioritize shared RHEL 9 hosts and systems with untrusted local users.
- Limit unnecessary local shell access to affected systems.
- Monitor vendor CVE guidance for status changes.
Validation and detection
- Inventory RHEL 9 kernel and kernel-rt package versions.
- Compare installed versions against the affected Red Hat entries.
- Confirm whether SCTP support is present or used on scoped systems.
- Review system logs for unexplained hangs or crash patterns.
- Track remediation status against RHSA-2023:6583.
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-833: 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-2024-0639 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
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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.
SSVC decision data
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:N/I:N/A:H1.83.6redhatVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- Source timelineredhat
Made public.
- Source timelineredhat
Reported to Red Hat.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2023:6583CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2024-0639CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2258754CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://github.com/torvalds/linux/commit/6feb37b3b06e9049e20dcf7e23998f92c9c5be9aCVE reference, redhat
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.
Deadlock
Deadlock represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.