Security readout for executives and security teams
Plain-English summary
CVE-2024-0443 is a Linux kernel memory leak in blkio cgroup cleanup. A local user could trigger repeated resource cleanup failures until memory is exhausted, causing instability or out-of-memory conditions. This is primarily an availability risk, not a data theft or privilege escalation issue based on the provided sources.
Executive priority
Schedule remediation through normal kernel patch cycles, with faster handling for shared compute, multi-user, or container-hosting systems. Business impact is service instability rather than compromise of confidentiality or integrity based on current evidence.
Technical view
The flaw is in block/blk-cgroup.c. During cgroup destruction, cgroup_rstat_flush() only runs when css_release_work_fn() executes after the blkcg reference count reaches zero. A circular dependency can keep blkcg and some blkgs from being freed after they go offline, producing CWE-402 resource leakage.
Likely exposure
Exposure is most likely on affected Red Hat Enterprise Linux 8 and 9 kernel or kernel-rt systems, including listed RHEL 8 and RHEL 9.2 EUS package versions. RHEL 6 and 7 are listed as unaffected. Non-Red Hat exposure is not established in the provided bundle.
Exploitation context
The CVSS vector is local, low complexity, low privilege, no user interaction, with high availability impact. The bundle does not report active exploitation, and KEV is false. Treat this as a local denial-of-service risk, especially on shared Linux hosts or systems running untrusted local workloads.
Researcher notes
Key evidence comes from Red Hat’s CVE entry, RHSA advisories, Bugzilla reference, and upstream linux-block discussion. The bundle does not define exact upstream kernel version ranges or non-Red Hat distribution status, so avoid broad claims beyond the listed affected products.
Mitigation direction
- Apply the relevant Red Hat kernel updates from the listed RHSA advisories.
- Check Red Hat CVE guidance for exact fixed packages before deployment.
- Reboot systems after kernel updates so the fixed kernel is active.
- Limit untrusted local accounts or workloads until affected systems are patched.
- Monitor affected hosts for memory pressure and out-of-memory events.
Validation and detection
- Inventory RHEL version, kernel package, and kernel-rt usage across Linux hosts.
- Compare installed kernel builds with Red Hat CVE and RHSA advisory data.
- Confirm patched systems booted into the updated kernel after maintenance.
- Review local workload models for untrusted users or container tenants.
- Check system logs and monitoring for repeated OOM or memory exhaustion symptoms.
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-402: 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-2024-0443 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
- RHSA-2023:7077CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- RHSA-2023:7370CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2024-0443CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2257968CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://lore.kernel.org/linux-block/20221215033132.230023-3-longman@redhat.com/CVE 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.
Transmission of Private Resources into a New Sphere ('Resource Leak')
Transmission of Private Resources into a New Sphere ('Resource Leak') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.