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CVE Record

CVE-2025-38530: comedi: pcl812: Fix bit shift out of bounds

In the Linux kernel, the following vulnerability has been resolved: comedi: pcl812: Fix bit shift out of bounds When checking for a supported IRQ number, the following test is used: if ((1 << it->options[1]) & board->irq_bits) { However, `it->options[i]` is an unchecked `int` value from userspace, so the shift amount could be negative or out of bounds. Fix the test by requiring `it->options[1]` to be within bounds before proceeding with the original test. Valid `it->options[1]` values that select the IRQ will be in the range [1,15]. The value 0 explicitly disables the use of interrupts.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2025-38530 is a Linux kernel bug in the comedi pcl812 driver. A value supplied from userspace was not bounds-checked before a bit shift. The public record does not state a business impact, CVSS score, or active exploitation. Treat it as a kernel maintenance risk, especially where this driver is present or used.

Executive priority

Schedule remediation through the normal kernel patch process unless local exposure to this driver is confirmed. Escalate priority for systems using comedi pcl812 in operational environments, because kernel bugs can have outsized reliability or security consequences despite incomplete scoring.

Technical view

The vulnerable code checks a supported IRQ using an unchecked userspace-controlled integer as the shift amount. Negative or out-of-range values can trigger an out-of-bounds bit shift. The resolved logic requires option 1 to be within the valid IRQ selection range before applying the original IRQ bitmask test.

Likely exposure

Exposure appears limited to Linux systems with affected kernel versions where the comedi pcl812 driver path is reachable. The source bundle does not identify remote exposure, default exploitability, affected distributions beyond Debian notices, or impacted hardware deployments.

Exploitation context

No active exploitation is supported by the provided sources. The CVE is not marked KEV, and the bundle does not include public exploit claims. The described input comes from userspace, so validation should focus on local kernel attack surface and driver availability.

Researcher notes

The record identifies the root cause and fixed logic but omits CVSS, CWE, exploitability, and concrete impact. Avoid assuming privilege escalation or denial of service without additional evidence. Review the stable commits and downstream advisories for exact backport coverage.

Mitigation direction

  • Apply vendor kernel updates that include the referenced stable fixes.
  • For Debian LTS systems, follow the cited Debian LTS advisories.
  • Prioritize hosts where comedi pcl812 is enabled or operationally required.
  • If patching is delayed, check vendor guidance for supported compensating measures.

Validation and detection

  • Inventory Linux kernel versions against the affected and fixed version information.
  • Confirm whether the comedi pcl812 driver is present, loaded, or required.
  • Check distribution security advisories for backported fixes in installed packages.
  • Document any systems deferred from patching and their business justification.
Prepared
Confidence
medium
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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.

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CVE-2025-38530 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
3Timeline events
1ADP providers
11Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxfcdb427bc7cf5e9e5d7280cf09c08dec49b49432, fcdb427bc7cf5e9e5d7280cf09c08dec49b49432, fcdb427bc7cf5e9e5d7280cf09c08dec49b49432, fcdb427bc7cf5e9e5d7280cf09c08dec49b49432, fcdb427bc7cf5e9e5d7280cf09c08dec49b49432, fcdb427bc7cf5e9e5d7280cf09c08dec49b49432, fcdb427bc7cf5e9e5d7280cf09c08dec49b49432, fcdb427bc7cf5e9e5d7280cf09c08dec49b49432unaffected
LinuxLinux2.6.30, 0, 5.4.297, 5.10.241, 5.15.190, 6.1.147, 6.6.100, 6.12.40, 6.15.8, 6.16affected
Weakness

CWE details

No CWE listed

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