Security readout for executives and security teams
Plain-English summary
CVE-2025-21982 is a Linux kernel flaw in the Nuvoton NPCM8xx pin control driver. If a memory allocation fails, missing NULL checks can crash the kernel. The business impact is availability loss on affected systems, not data theft or remote compromise based on available sources.
Executive priority
Treat as a targeted availability risk. Patch through normal kernel maintenance, faster for exposed management hardware or multi-user systems. It does not currently justify emergency response unless affected assets support critical operations.
Technical view
The bug is CWE-476 NULL pointer dereference in npcm8xx_gpio_fw(). devm_kasprintf() may return NULL, but return values were not checked. CVSS 3.1 is 5.5, local attack vector, low complexity, low privileges, no confidentiality or integrity impact, high availability impact.
Likely exposure
Exposure is most likely on Linux systems using affected kernel versions with the Nuvoton NPCM8xx pinctrl/GPIO driver, commonly relevant to specific embedded or BMC-style hardware. The source bundle does not prove broad exposure across all Linux deployments.
Exploitation context
The CVE record does not cite active exploitation, and KEV status is false. The CVSS vector indicates local, low-privilege conditions with no user interaction. Available evidence supports denial-of-service risk through kernel crash, not remote code execution.
Researcher notes
Evidence is limited to the CVE record and Linux stable commit references. The bug class and CVSS support local denial of service. Do not assume exploitability beyond affected driver paths without testing the specific kernel, hardware, and downstream backport state.
Mitigation direction
- Update to a vendor or distribution kernel containing the referenced stable fixes.
- Prioritize affected Nuvoton NPCM8xx-based systems where local users or workloads are untrusted.
- If patch timing is unclear, check Linux vendor advisories for fixed package versions.
- Limit unnecessary local access to affected embedded or management systems until patched.
Validation and detection
- Inventory systems running Linux kernels listed as affected in the CVE source bundle.
- Confirm whether the Nuvoton NPCM8xx pinctrl/GPIO driver is present and in use.
- Verify the installed kernel includes one of the referenced stable commits or downstream backport.
- Review vendor security notes for fixed kernel package versions and reboot requirements.
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-2025-21982 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/a585f6ea42ec259a9a57e3e2580fa527c92187d0CVE reference, Linux
- https://git.kernel.org/stable/c/6a08a86e5aff8e65368ccd463348fdda26100821CVE reference, Linux
- https://git.kernel.org/stable/c/acf40ab42799e4ae1397ee6f5c5941092d66f999CVE 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.