Security readout for executives and security teams
Plain-English summary
This is a Linux kernel use-after-free in DRM KUnit test helper cleanup. The documented failure frees a DRM driver before device-managed cleanup still references it, causing a KASAN crash. The source does not show remote exposure or active exploitation.
Executive priority
Treat as high priority for kernel engineering and platform teams, especially where custom kernels are built or tested. For typical production services, urgency depends on whether affected kernel code is present and reachable in your environment.
Technical view
CVE-2023-53235 is CWE-416 in Linux DRM tests, involving __drm_kunit_helper_alloc_drm_device(). KUnit-managed cleanup releases the driver before devres cleanup calls drm_dev_put(), which dereferences the freed driver. CVSS 3.1 is 7.8 with local attack vector and low privileges.
Likely exposure
Most likely exposure is affected Linux kernel versions or builds using the vulnerable DRM KUnit helper. The bundle lists Linux kernel 6.3, 6.5.5, and 6.6 version data, but exact range interpretation is incomplete.
Exploitation context
No KEV listing is reported, and the bundle provides no evidence of active exploitation. The evidence is a KASAN use-after-free during KUnit test cleanup, not a public exploit chain.
Researcher notes
The public description is strong on root cause but limited on exploitability outside test cleanup. Avoid assuming remote impact. Validate against kernel commit ancestry and distro backports rather than raw upstream version numbers alone.
Mitigation direction
- Review the referenced Linux stable commits for the applied fix.
- Update affected Linux kernels through vendor-supported channels.
- Prioritize systems using custom kernels or DRM/KUnit test infrastructure.
- Check distribution advisories for backported fixes and exact package versions.
Validation and detection
- Inventory Linux kernel versions across relevant hosts and build environments.
- Check whether DRM KUnit tests or custom DRM kernel testing is enabled.
- Confirm the stable fix commits are present in your kernel tree.
- Run existing kernel regression tests after updating or backporting.
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-416: 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-2023-53235 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H/I:H/A:H1.85.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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/c9d8be0e533738b744abb669263c4750d4830009CVE reference, Linux
- https://git.kernel.org/stable/c/139a27854bf5ce93ff9805f9f7683b88c13074dcCVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.