Security readout for executives and security teams
Plain-English summary
CVE-2023-53236 is a Linux kernel availability issue in iommufd. A local user with low privileges could trigger page accounting or metadata corruption, potentially crashing or destabilizing affected systems. There is no source-bundle evidence of active exploitation.
Executive priority
Schedule remediation through normal kernel patch cycles, with faster handling for multi-user or virtualization-heavy systems. The business risk is system instability or denial of service, not confirmed data theft or remote compromise from the provided evidence.
Technical view
The bug is an ordering error in iommufd PFN batch carry handling. When batch->end is 0, updating npfns[0] before recalculating pfns can corrupt PFN tracking and lead to page metadata/accounting failures. CVSS is 5.5: local, low complexity, low privileges, no user interaction, high availability impact.
Likely exposure
Exposure is most relevant to Linux systems running affected kernel versions identified in the record, including 6.2, 6.2.11, and 6.3. Distributor backports may change exposure, so validate the exact package version and applied fixes.
Exploitation context
The CVSS vector indicates local access with low privileges is required. The source bundle does not include public exploit evidence, KEV listing, or remote attack claims. Treat this as a local denial-of-service style risk unless vendor advisories state otherwise.
Researcher notes
The record describes a resolved upstream kernel bug with two stable commit references. Evidence supports availability impact through PFN list corruption and page metadata failures. No CWE, exploit status, or distributor-specific fixed package versions are provided in the source bundle.
Mitigation direction
- Upgrade to a Linux kernel build containing the referenced stable fixes.
- Check distribution security advisories for backported fixes before relying on upstream version numbers.
- Prioritize systems where untrusted local users can access affected kernel functionality.
- Apply normal change controls and reboot requirements for kernel updates.
- If patching is delayed, follow vendor guidance for temporary controls.
Validation and detection
- Inventory Linux kernel versions across servers, workstations, and images.
- Compare installed kernels with vendor advisories and the referenced stable commits.
- Confirm whether affected systems expose iommufd-related functionality to local users.
- Review crash logs for page accounting or metadata corruption symptoms.
- Retest after patching to confirm the fixed kernel is active.
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-2023-53236 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:H1.83.6CISA-ADPVulnerability 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.
- 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
- https://git.kernel.org/stable/c/6ed5784526ddc0fb58b1798af36ec0c3139a8dcaCVE reference, Linux
- https://git.kernel.org/stable/c/13a0d1ae7ee6b438f5537711a8c60cba00554943CVE reference, Linux
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.