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CVE Record

CVE-2025-21794: HID: hid-thrustmaster: fix stack-out-of-bounds read in usb_check_int_endpoints()

In the Linux kernel, the following vulnerability has been resolved: HID: hid-thrustmaster: fix stack-out-of-bounds read in usb_check_int_endpoints() Syzbot[1] has detected a stack-out-of-bounds read of the ep_addr array from hid-thrustmaster driver. This array is passed to usb_check_int_endpoints function from usb.c core driver, which executes a for loop that iterates over the elements of the passed array. Not finding a null element at the end of the array, it tries to read the next, non-existent element, crashing the kernel. To fix this, a 0 element was added at the end of the array to break the for loop. [1] https://syzkaller.appspot.com/bug?extid=9c9179ac46169c56c1ad

HighCVSS 7.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

CVE-2025-21794 is a Linux kernel bug in the Thrustmaster HID driver that can crash the kernel when malformed endpoint data is processed. The practical business impact is local denial of service and potential exposure of kernel memory. It requires local access, so prioritize systems where untrusted users or USB devices are realistic.

Executive priority

Treat as a high-priority patching item for Linux endpoints with local or USB exposure. It is not evidenced as remotely exploitable or actively exploited from the provided sources, but kernel crashes and confidentiality impact justify timely remediation.

Technical view

The hid-thrustmaster driver passed an ep_addr array to usb_check_int_endpoints() without a terminating zero element. The USB core loop read past the stack array, causing a stack out-of-bounds read and kernel crash. Sources identify CWE-125, CVSS 7.1, and stable kernel fixes adding the missing sentinel.

Likely exposure

Linux systems running kernel builds containing the vulnerable hid-thrustmaster code may be exposed, especially endpoints or workstations where local users can attach or interact with USB HID devices. The bundle does not prove broad remote exposure or identify every affected distribution version.

Exploitation context

The CVSS vector is local, low complexity, low privileges, no user interaction. The bundle says syzbot found the crash. KEV is false, and no cited source here supports active exploitation in the wild.

Researcher notes

Root cause is a missing zero sentinel in ep_addr passed into usb_check_int_endpoints(). The fix adds a terminating 0 to stop iteration. Evidence comes from the CVE record, Linux stable commits, syzkaller reference in the description, and Debian LTS notice.

Mitigation direction

  • Apply Linux kernel vendor updates containing the referenced stable fixes.
  • Check Debian LTS and other distro advisories for backported kernel packages.
  • Prioritize workstations and shared systems with local user or USB device exposure.
  • Limit untrusted USB HID device use until patched.
  • Follow vendor guidance if your kernel is custom or downstream-patched.

Validation and detection

  • Inventory Linux kernel versions across exposed workstations and servers.
  • Confirm installed kernels include a referenced stable commit or distro backport.
  • Review whether hid-thrustmaster is built, loaded, or available as a module.
  • Check kernel logs for unexplained HID or USB-related crashes.
  • Validate updates in staging before broad endpoint rollout.
Prepared
Confidence
high
Sources
8

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.

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 · low confidence lookup

CWE-125: 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 lookup
cve · low confidence lookup

CVE-2025-21794 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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.

1CVSS vectors
3Timeline events
2ADP providers
7Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
7.1CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H1.85.2CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

7.1High
CVSS 3.1 vector shape for CVE-2025-21794Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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

CISA-ADPCISA ADP Vulnrichment
cvssV3_1other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux220883fba32549a34f0734e4859d07f4dcd56992, ae730deded66150204c494282969bfa98dc3ae67, e5bcae4212a6a4b4204f46a1b8bcba08909d2007, 816e84602900f7f951458d743fa12769635ebfd5, 50420d7c79c37a3efe4010ff9b1bb14bc61ebccfunaffected
LinuxLinux6.6.76, 6.12.13, 6.13.2unaffected
Weakness

CWE details

CWE-125

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-125 · source CWE mapping

Out-of-bounds Read

Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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