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CVE Record

CVE-2024-35924: usb: typec: ucsi: Limit read size on v1.2

In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: Limit read size on v1.2 Between UCSI 1.2 and UCSI 2.0, the size of the MESSAGE_IN region was increased from 16 to 256. In order to avoid overflowing reads for older systems, add a mechanism to use the read UCSI version to truncate read sizes on UCSI v1.2.

HighCVSS 7.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

A Linux USB Type-C driver can read more data than older UCSI 1.2 systems provide because UCSI 2.0 enlarged a message region. This may expose kernel memory or disrupt the system. Exploitation requires local, low-privileged access according to the supplied CVSS assessment.

Executive priority

Treat this as a high-priority local privilege-bound kernel issue, especially on shared or multi-user Linux systems with UCSI 1.2 hardware. Patch through supported distribution channels after normal compatibility testing. Internet-wide emergency action is not supported by the supplied evidence.

Technical view

The Linux UCSI Type-C code did not restrict MESSAGE_IN reads to the 16-byte UCSI 1.2 size after UCSI 2.0 increased it to 256 bytes. On older systems, oversized reads may cross valid boundaries. The kernel fixes use the detected UCSI version to truncate reads appropriately.

Likely exposure

Exposure is limited to Linux systems using the affected UCSI driver with older UCSI 1.2-compatible hardware or firmware. The supplied version metadata names Linux 5.5, 6.6.27, 6.8.6, and 6.9, but does not clearly express complete affected or fixed ranges.

Exploitation context

The CVSS vector describes a local, low-complexity attack requiring low privileges and no user interaction, with possible high confidentiality and availability impact. The source bundle marks this CVE as absent from KEV, and provides no evidence of active exploitation or a public exploit.

Researcher notes

No CWE is assigned in the bundle. The affected-version data is ambiguous and includes duplicated commit identifiers, so exposure should be established through vendor advisories and patch ancestry. The supplied stable commits implement version-aware read truncation; the sources do not establish exploitability beyond the stated CVSS impacts.

Mitigation direction

  • Install a vendor-supported kernel containing the applicable upstream stable fix.
  • Prioritize systems combining affected kernels with UCSI 1.2 hardware or firmware.
  • If immediate updating is unavailable, check distribution or hardware-vendor guidance for supported mitigations.
  • Avoid assuming a listed version is safe without confirming its vendor backport status.

Validation and detection

  • Inventory kernel versions and identify systems using the Linux UCSI Type-C driver.
  • Determine the UCSI version reported by relevant hardware or firmware.
  • Confirm the installed vendor kernel includes the applicable stable fix or documented backport.
  • Review kernel logs for unexplained UCSI, USB Type-C, memory, or stability errors.
Prepared
Confidence
medium
Sources
5

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-2024-35924 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
4Source 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:H1.85.2Linux

Vulnerability scoring details

Base CVSS 3.1 score

7.1High
CVSS 3.1 vector shape for CVE-2024-35924Attack 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
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxbdc62f2bae8fb0e8e99574de5232f0a3c54a27df, bdc62f2bae8fb0e8e99574de5232f0a3c54a27df, bdc62f2bae8fb0e8e99574de5232f0a3c54a27dfunaffected
LinuxLinux5.5, 0, 6.6.27, 6.8.6, 6.9affected
Weakness

CWE details

No CWE listed

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