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CVE Record

CVE-2023-53034: ntb_hw_switchtec: Fix shift-out-of-bounds in switchtec_ntb_mw_set_trans

In the Linux kernel, the following vulnerability has been resolved: ntb_hw_switchtec: Fix shift-out-of-bounds in switchtec_ntb_mw_set_trans There is a kernel API ntb_mw_clear_trans() would pass 0 to both addr and size. This would make xlate_pos negative. [ 23.734156] switchtec switchtec0: MW 0: part 0 addr 0x0000000000000000 size 0x0000000000000000 [ 23.734158] ================================================================================ [ 23.734172] UBSAN: shift-out-of-bounds in drivers/ntb/hw/mscc/ntb_hw_switchtec.c:293:7 [ 23.734418] shift exponent -1 is negative Ensuring xlate_pos is a positive or zero before BIT.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel bug in the Switchtec NTB hardware driver. A clear-translation path can pass zero address and size values, causing a negative bit shift and undefined behavior detected by UBSAN. Sources do not show remote exposure, active exploitation, CVSS severity, or a named business-impact outcome.

Executive priority

Treat as targeted infrastructure hygiene unless Switchtec NTB hardware is in production. Prioritize patching affected specialized systems during normal kernel maintenance, escalating only where this hardware supports critical availability workloads.

Technical view

The issue is in drivers/ntb/hw/mscc/ntb_hw_switchtec.c, where ntb_mw_clear_trans() can lead switchtec_ntb_mw_set_trans() to compute a negative xlate_pos before BIT(). The upstream resolution checks that xlate_pos is zero or positive before using it.

Likely exposure

Exposure appears limited to Linux systems using the Microchip/Microsemi Switchtec NTB hardware driver. Organizations without Switchtec NTB hardware or the relevant driver enabled are unlikely to be exposed based on the provided sources.

Exploitation context

The CVE is not listed as KEV, and the provided sources do not claim active exploitation, public exploit code, or remote attackability. The evidence shows a kernel driver correctness flaw triggered through a kernel API path.

Researcher notes

The record lacks CVSS, CWE, and exploitability detail. Analysis should focus on affected kernel branches, Switchtec NTB driver presence, and whether downstream vendors have backported one of the referenced stable commits.

Mitigation direction

  • Identify Linux systems using the Switchtec NTB driver.
  • Update affected kernels to vendor or distribution builds containing the stable fixes.
  • Review Debian LTS advisories if running Debian-based affected kernels.
  • If updates are unavailable, check vendor guidance for safe operational mitigations.

Validation and detection

  • Check kernel version and distribution security advisory status.
  • Confirm whether Switchtec NTB hardware and driver are present.
  • Review package changelogs for CVE-2023-53034 or the referenced stable commits.
  • Monitor kernel logs for UBSAN shift-out-of-bounds reports in ntb_hw_switchtec.c.
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

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CVE-2023-53034 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
2ADP providers
12Source links

SSVC decision data

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

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
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux1e2fd202f8593985cdadca32e0c322f98e7fe7cb, 1e2fd202f8593985cdadca32e0c322f98e7fe7cb, 1e2fd202f8593985cdadca32e0c322f98e7fe7cb, 1e2fd202f8593985cdadca32e0c322f98e7fe7cb, 1e2fd202f8593985cdadca32e0c322f98e7fe7cb, 1e2fd202f8593985cdadca32e0c322f98e7fe7cb, 1e2fd202f8593985cdadca32e0c322f98e7fe7cb, 1e2fd202f8593985cdadca32e0c322f98e7fe7cb, 1e2fd202f8593985cdadca32e0c322f98e7fe7cbunaffected
LinuxLinux4.16, 0, 5.4.292, 5.10.236, 5.15.180, 6.1.134, 6.6.87, 6.12.23, 6.13.11, 6.14.2, 6.15affected
Weakness

CWE details

No CWE listed

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