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CVE Record

CVE-2025-21746: Input: synaptics - fix crash when enabling pass-through port

In the Linux kernel, the following vulnerability has been resolved: Input: synaptics - fix crash when enabling pass-through port When enabling a pass-through port an interrupt might come before psmouse driver binds to the pass-through port. However synaptics sub-driver tries to access psmouse instance presumably associated with the pass-through port to figure out if only 1 byte of response or entire protocol packet needs to be forwarded to the pass-through port and may crash if psmouse instance has not been attached to the port yet. Fix the crash by introducing open() and close() methods for the port and check if the port is open before trying to access psmouse instance. Because psmouse calls serio_open() only after attaching psmouse instance to serio port instance this prevents the potential crash.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2025-21746 is a Linux kernel crash bug in the Synaptics touchpad input driver. During pass-through port setup, an interrupt can arrive before the related psmouse object is attached, causing a null or invalid access and a kernel crash. Sources do not report active exploitation or remote attack impact.

Executive priority

Treat as a targeted stability issue, not an emergency breach signal based on current evidence. Prioritize through normal kernel patch cycles, with faster handling for managed Linux laptops where input-driver crashes affect availability.

Technical view

The synaptics sub-driver may access a psmouse instance for a pass-through serio port before psmouse binds to it. The fix adds port open and close methods and checks that the port is open before forwarding responses, preventing access before attachment.

Likely exposure

Exposure is most plausible on Linux systems using Synaptics PS/2 touchpad support and affected kernel builds. Server exposure is likely limited unless such input hardware and drivers are present. The source bundle does not provide CPEs, CVSS, or distribution-specific package ranges.

Exploitation context

The CVE record is not marked KEV, and the supplied sources do not state public exploitation. The described impact is a crash during device initialization or pass-through enablement, not confirmed privilege escalation or data compromise.

Researcher notes

Evidence is limited to the kernel fix description and stable commit references. The root condition is a race during pass-through port enablement before psmouse attachment. No source-provided exploitability rating, CVSS vector, CWE, or distribution package mapping is available.

Mitigation direction

  • Update to a vendor kernel containing the referenced stable fixes.
  • Prioritize laptops and workstations using Synaptics PS/2 touchpad hardware.
  • Check Linux distribution advisories for exact fixed package versions.
  • Apply standard reboot procedures after kernel updates.
  • If patching is delayed, monitor affected endpoints for kernel input-driver crashes.

Validation and detection

  • Inventory Linux kernel versions across laptops and workstations.
  • Identify systems using Synaptics PS/2 touchpad or psmouse support.
  • Confirm vendor kernels include one of the referenced stable commits.
  • Review crash telemetry for synaptics or psmouse-related kernel faults.
  • Track CVE status for any later CVSS, CWE, or exploitation updates.
Prepared
Confidence
medium
Sources
6

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-2025-21746 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
0ADP providers
5Source 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.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux100e16959c3ca8cb7be788ed3e2c5867481f35f6, 100e16959c3ca8cb7be788ed3e2c5867481f35f6, 100e16959c3ca8cb7be788ed3e2c5867481f35f6, 100e16959c3ca8cb7be788ed3e2c5867481f35f6unaffected
LinuxLinux6.5, 0, 6.6.80, 6.12.17, 6.13.3, 6.14affected
Weakness

CWE details

No CWE listed

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