Security readout for executives and security teams
Plain-English summary
CVE-2023-53244 is a Linux kernel crash risk in the tw68 PCI media driver. A local, low-privileged user may be able to trigger a null pointer dereference, causing system availability impact. No active exploitation is reported in the provided sources.
Executive priority
Treat this as a moderate availability risk, not a data theft issue. Patch through normal kernel maintenance, but accelerate for multi-user systems or endpoints with relevant capture hardware.
Technical view
The tw68 driver could continue after dma_alloc_coherent failed inside tw68_risc_buffer, leaving buf->cpu empty. Later buffer access or free could dereference NULL. The upstream fix checks tw68_risc_buffer return handling and buf->cpu before freeing.
Likely exposure
Exposure is most relevant to Linux systems using the tw68 PCI media driver, especially where local users can interact with video capture devices. Cloud servers without this driver or hardware are unlikely to be exposed.
Exploitation context
The CVSS vector is local, low complexity, low privilege, no user interaction, with high availability impact only. The source says it may be dynamically triggered from user side, but KEV status is false and no public exploitation evidence is provided.
Researcher notes
Evidence is limited to CVE metadata and Linux stable commit references. The issue is CWE-476 null pointer dereference in media/pci/tw68 buffer preparation and cleanup paths after allocation failure.
Mitigation direction
- Update to a vendor kernel containing the referenced stable fixes.
- Check Linux distribution advisories for backported fixes and affected package versions.
- Restrict local access to relevant video devices where operationally feasible.
- Prioritize systems with tw68 hardware, shared local users, or untrusted workloads.
Validation and detection
- Inventory kernels and determine whether the tw68 driver is present or loadable.
- Confirm vendor kernel packages include the referenced stable commits or equivalent backports.
- Review local user and device access paths for video capture devices.
- Track distribution advisories because source metadata may not map cleanly to package versions.
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-476: 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-2023-53244 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/dcf632bca424e6ff8c8eb89c96694e7f05cd29b6CVE reference, Linux
- https://git.kernel.org/stable/c/3c67f49a6643d973e83968ea35806c7b5ae68b56CVE reference, Linux
- https://git.kernel.org/stable/c/3715c5e9a8f96b6ed0dcbea06da443efccac1eccCVE reference, Linux
- https://git.kernel.org/stable/c/1634b7adcc5bef645b3666fdd564e5952a9e24e0CVE 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.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.