Security readout for executives and security teams
Plain-English summary
CVE-2025-39755 is a Linux kernel availability flaw in a niche staging GPIB PCMCIA driver. A missing driver name initialization can trigger a NULL pointer dereference and kernel Oops. The available evidence points to local denial of service, not data theft or remote compromise.
Executive priority
Handle through normal kernel patch management unless affected systems are shared, safety-sensitive, or depend on PCMCIA/GPIB hardware. Business urgency is moderate because impact is availability-only and local, but kernel crashes can still disrupt operations.
Technical view
The cb7210 PCMCIA GPIB staging driver initialized only the old drv.name field. During pcmcia_register_driver, strcmp can receive a NULL pointer and crash the kernel path. The resolved change initializes the pcmcia_driver name field. CVSS is 5.5 with local attack vector, low privileges, and high availability impact.
Likely exposure
Exposure is most likely on Linux systems running affected kernel builds with the staging gpib cb7210 PCMCIA driver present or loadable. This appears specialized rather than broad enterprise exposure. Confirm against vendor kernels because distributions may backport fixes without changing major version numbers.
Exploitation context
The source bundle does not show CISA KEV listing, active exploitation, or public exploit evidence. The CVSS vector indicates local, low-privilege conditions with no user interaction. Treat this mainly as a local denial-of-service risk where the affected driver path is reachable.
Researcher notes
Evidence is limited to the CVE record and Linux stable references. The affected-version data in the bundle is sparse and should be reconciled with vendor advisories. Do not assume remote reachability or confidentiality impact from the provided sources.
Mitigation direction
- Apply a vendor kernel update containing the referenced stable fixes.
- Track distribution advisories for backported kernel fixes.
- If unused, avoid enabling or loading the cb7210 GPIB PCMCIA staging driver.
- Prioritize remediation on shared, multi-user, or lab systems using PCMCIA/GPIB hardware.
Validation and detection
- Inventory Linux kernel versions and vendor patch status.
- Check whether the cb7210 GPIB PCMCIA staging driver is built or loadable.
- Confirm whether systems use PCMCIA/GPIB hardware or related kernel modules.
- Review kernel crash logs for NULL pointer Oops near pcmcia_register_driver or strcmp.
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
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CWE-476: Exact CWE lookup
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Open ATT&CK lookupCVE-2025-39755 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/7ec50077d7f6647cb6ba3a2a20a6c26f51259c7dCVE reference, Linux
- https://git.kernel.org/stable/c/c82ae06f49e70d1c14ee9c76c392345856d050c9CVE reference, Linux
- https://git.kernel.org/stable/c/c1baf6528bcfd6a86842093ff3f8ff8caf309c12CVE 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.