CVE-2023-53034

Data disclosure and crash via negative shift

Published Apr 16, 2025 · Updated Aug 5, 2026

Shift-out-of-bounds handling in the Linux kernel Switchtec NTB driver allows adjacent attackers to disclose data or crash the system. The switchtec_ntb_mw_set_trans function subtracts one from a zero translation length passed by ntb_mw_clear_trans, making xlate_pos negative before BIT shifts by that value. Reachability requires Switchtec NTB hardware and an adjacent peer able to cause memory-window translation clearing; reported consequences are limited to information disclosure and system denial of service.

CVSS severity7.1
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Shift-out-of-bounds handling in the Linux kernel Switchtec NTB driver allows adjacent attackers to disclose data or crash the system. The switchtec_ntb_mw_set_trans function subtracts one from a zero translation length passed by ntb_mw_clear_trans, making xlate_pos negative before BIT shifts by that value. Reachability requires Switchtec NTB hardware and an adjacent peer able to cause memory-window translation clearing; reported consequences are limited to information disclosure and system denial of service.

The record

CVE
CVE-2023-53034
Published
Apr 16, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <0df2e03e4620548b41891b4e0d1bd9d2e0d8a39a
  2. Affected versionversion=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <2429bdf26a0f3950fdd996861e9c1a3873af1dbe
  3. Affected versionversion=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <36d32cfb00d42e865396424bb5d340fc0a28870d
  4. Affected versionversion=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <5b6857bb3bfb0dae17fab1e42c1e82c204a508b1
  5. Affected versionversion=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <7ed22f8d8be26225a78cf5e85b2036421a6bf2d5
  6. Affected versionversion=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <c61a3f2df162ba424be0141649a9ef5f28eaccc1
  7. Affected versionversion=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <cb153bdc1812a3375639ed6ca5f147eaefb65349
  8. Affected versionversion=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <de203da734fae00e75be50220ba5391e7beecdf9
  9. Affected versionversion=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <f56951f211f181410a383d305e8d370993e45294
  10. Affected versionversion=4.16

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <0df2e03e4620548b41891b4e0d1bd9d2e0d8a39a; version=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <2429bdf26a0f3950fdd996861e9c1a3873af1dbe; version=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <36d32cfb00d42e865396424bb5d340fc0a28870d; version=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <5b6857bb3bfb0dae17fab1e42c1e82c204a508b1; version=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <7ed22f8d8be26225a78cf5e85b2036421a6bf2d5; version=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <c61a3f2df162ba424be0141649a9ef5f28eaccc1; version=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <cb153bdc1812a3375639ed6ca5f147eaefb65349; version=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <de203da734fae00e75be50220ba5391e7beecdf9; version=1e2fd202f8593985cdadca32e0c322f98e7fe7cb <f56951f211f181410a383d305e8d370993e45294; version=4.16

Published CVSS scores

7.1LinuxCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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