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CVE Record

CVE-2025-68819: media: dvb-usb: dtv5100: fix out-of-bounds in dtv5100_i2c_msg()

In the Linux kernel, the following vulnerability has been resolved: media: dvb-usb: dtv5100: fix out-of-bounds in dtv5100_i2c_msg() rlen value is a user-controlled value, but dtv5100_i2c_msg() does not check the size of the rlen value. Therefore, if it is set to a value larger than sizeof(st->data), an out-of-bounds vuln occurs for st->data. Therefore, we need to add proper range checking to prevent this vuln.

HighCVSS 7.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A flaw in Linux’s dtv5100 digital-TV USB driver allows a locally authenticated user to supply an oversized read length, causing memory access beyond an internal buffer. Successful exploitation could compromise confidentiality, integrity, or system availability. Exposure depends on the affected driver being present and reachable.

Executive priority

Treat as an expedited kernel remediation for systems exposing the dtv5100 driver to untrusted local users. Prioritize shared endpoints, appliances, and multi-user hosts. Scope first, because the issue is driver-specific and not remotely exploitable according to the supplied CVSS vector.

Technical view

The dtv5100_i2c_msg() function failed to validate the user-controlled rlen value against sizeof(st->data). An oversized value can produce an out-of-bounds access involving st->data. Linux stable fixes add range checking, with separate commits supplied for supported kernel branches.

Likely exposure

Most relevant to Linux systems running an affected kernel where the dvb-usb dtv5100 driver is installed and accessible. The CVSS vector requires local access and low privileges, with no user interaction. Systems without this driver or already carrying the appropriate stable fix are unlikely to be exposed.

Exploitation context

The supplied CVSS score is 7.8 and indicates potentially high confidentiality, integrity, and availability impact. Exploitation requires local, low-privileged access. The bundle reports that this CVE is not in KEV and provides no evidence of active exploitation.

Researcher notes

The source bundle identifies the vulnerable function and missing length check but does not provide a CWE, exploit evidence, or detailed reachability conditions. Its affected-version data mixes release identifiers and commit hashes, so branch-specific status should be confirmed through the listed stable commits and distributor guidance.

Mitigation direction

  • Update to a vendor-supported kernel containing the applicable Linux stable fix.
  • Match the running kernel branch to the appropriate referenced stable commit.
  • Consult the Linux distributor’s advisory for exact fixed package versions.
  • Prioritize shared systems where untrusted users can obtain local access.

Validation and detection

  • Inventory kernel versions across systems that may use DVB-USB hardware.
  • Determine whether the dtv5100 driver is present, loaded, or operationally required.
  • Verify the applicable stable commit or vendor backport is installed.
  • Recheck the distributor’s package changelog after updating.
Prepared
Confidence
medium
Sources
9

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

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CVE-2025-68819 mapping review

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.8 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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
0ADP providers
8Source links

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
7.8CVSS 3.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.8High
CVSS 3.1 vector shape for CVE-2025-68819Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817, 60688d5e6e6e2ae62f29762d1e3b2aec2dbd3817unaffected
LinuxLinux2.6.28, 0, 5.10.248, 5.15.198, 6.1.160, 6.6.120, 6.12.64, 6.18.3, 6.19affected
Weakness

CWE details

No CWE listed

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