Security readout for executives and security teams
Plain-English summary
CVE-2023-52490 is a Linux kernel availability bug. Under page migration and memory hotplug stress, the kernel can read an incorrect page mapping and crash. The documented impact is denial of service, not data theft or code execution.
Executive priority
Treat this as a routine but real availability risk. It is most urgent for multi-user Linux hosts, shared compute, and systems where a local crash has business impact. Patch through normal kernel maintenance unless internal exposure is unusually high.
Technical view
During page migration, the target page used page->mapping to temporarily store anon_vma without PAGE_MAPPING_ANON. Concurrent memory offlining could call page_mapping() and treat that value as a file mapping, triggering a NULL pointer dereference in dump_mapping(). The upstream fix moves this temporary state to page->private.
Likely exposure
Exposure is limited to Linux systems running affected kernel versions where local low-privileged activity can trigger page migration and memory hotplug/offlining paths. Systems without affected kernels or without reachable memory hotplug behavior are less exposed based on the supplied evidence.
Exploitation context
The CVE has CVSS 5.5 with local access, low complexity, low privileges, no user interaction, and high availability impact. The source bundle does not indicate CISA KEV listing or active exploitation. The reported crash was found during stress-ng testing.
Researcher notes
Evidence supports a race-sensitive NULL pointer dereference in Linux memory management, fixed by changing where migration stores temporary anon_vma state. The supplied sources do not prove exploitability beyond local denial of service or provide product-specific vendor backport status.
Mitigation direction
- Identify Linux kernel versions across servers, appliances, and cloud images.
- Apply vendor kernel updates containing the referenced stable fixes.
- Prioritize systems that allow local users or workloads to exercise memory hotplug paths.
- If updates are unavailable, check vendor guidance for supported workarounds.
- Monitor for kernel NULL pointer crashes around page migration or memory offlining.
Validation and detection
- Confirm each system kernel version against vendor advisories and CVE-2023-52490 metadata.
- Check whether relevant stable commits are included in the running kernel build.
- Review crash logs for dentry_name, dump_page, offline_pages, or memory_block_offline traces.
- Verify updated kernels boot and pass normal workload stability testing.
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
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ATT&CK lookup starting points
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CWE-476: Exact CWE lookup
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Open ATT&CK lookupCVE-2023-52490 mapping review
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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.
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:H1.83.6Primary CVE scoreVulnerability 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
Source materials
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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.