CVE-2023-53272

Kernel panic via uncapped backoff exponent

Published Sep 16, 2025 · Updated Sep 16, 2025

Shift-out-of-bounds in the ENA driver in affected Linux kernel versions allows local users to trigger a kernel panic during adapter reset. The ena_delay_exponential_backoff_us function shifts a 32-bit value by an uncapped exponent, causing retry delays to wrap before an exponent of 32 invokes undefined behavior. Reachability requires an ENA-backed system and enough reset retries to raise the exponent; the bounded consequence is a kernel panic and service interruption.

CVSS severity7.1
High
EPSS probability0.16%
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 in the ENA driver in affected Linux kernel versions allows local users to trigger a kernel panic during adapter reset. The ena_delay_exponential_backoff_us function shifts a 32-bit value by an uncapped exponent, causing retry delays to wrap before an exponent of 32 invokes undefined behavior. Reachability requires an ENA-backed system and enough reset retries to raise the exponent; the bounded consequence is a kernel panic and service interruption.

The record

CVE
CVE-2023-53272
Published
Sep 16, 2025
Updated
Sep 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4bb7f4cf60e38a00965d22aa5979ab143193d41f <0939c264729d4a081ff88efce2ffdf85dc5331e0
  2. Affected versionversion=4bb7f4cf60e38a00965d22aa5979ab143193d41f <1e760b2d18bf129b3da052c2946c02758e97d15e
  3. Affected versionversion=4bb7f4cf60e38a00965d22aa5979ab143193d41f <1e9cb763e9bacf0c932aa948f50dcfca6f519a26
  4. Affected versionversion=4bb7f4cf60e38a00965d22aa5979ab143193d41f <3e36cc94d6e60a27f27498adf1c71eeba769ab33
  5. Affected versionversion=4bb7f4cf60e38a00965d22aa5979ab143193d41f <90947ebf8794e3c229fb2e16e37f1bfea6877f14
  6. Affected versionversion=5.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4bb7f4cf60e38a00965d22aa5979ab143193d41f <0939c264729d4a081ff88efce2ffdf85dc5331e0; version=4bb7f4cf60e38a00965d22aa5979ab143193d41f <1e760b2d18bf129b3da052c2946c02758e97d15e; version=4bb7f4cf60e38a00965d22aa5979ab143193d41f <1e9cb763e9bacf0c932aa948f50dcfca6f519a26; version=4bb7f4cf60e38a00965d22aa5979ab143193d41f <3e36cc94d6e60a27f27498adf1c71eeba769ab33; version=4bb7f4cf60e38a00965d22aa5979ab143193d41f <90947ebf8794e3c229fb2e16e37f1bfea6877f14; version=5.8

Published CVSS scores

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

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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