CVE-2023-52615

Local hwrng read hang via recursive page fault

Published Mar 18, 2024 · Updated May 11, 2026

Denial of service in the Linux kernel hwrng core allows local users to hang /dev/hwrng through a recursive read into mapped memory. The hwrng core calls copy_to_user from its device-read path against a destination mapped from the same device, so the page fault re-enters that path and deadlocks. Access to /dev/hwrng and a destination mapping of that device are required; the result is a blocked read path without data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel hwrng core allows local users to hang /dev/hwrng through a recursive read into mapped memory. The hwrng core calls copy_to_user from its device-read path against a destination mapped from the same device, so the page fault re-enters that path and deadlocks. Access to /dev/hwrng and a destination mapping of that device are required; the result is a blocked read path without data disclosure or modification.

The record

CVE
CVE-2023-52615
Published
Mar 18, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 18, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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?

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

  1. Affected versionversion=2.6.33
  2. Affected versionversion=9996508b3353063f2d6c48c1a28a84543d72d70b <26cc6d7006f922df6cc4389248032d955750b2a0
  3. Affected versionversion=9996508b3353063f2d6c48c1a28a84543d72d70b <5030d4c798863ccb266563201b341a099e8cdd48
  4. Affected versionversion=9996508b3353063f2d6c48c1a28a84543d72d70b <6822a14271786150e178869f1495cc03e74c5029
  5. Affected versionversion=9996508b3353063f2d6c48c1a28a84543d72d70b <78aafb3884f6bc6636efcc1760c891c8500b9922
  6. Affected versionversion=9996508b3353063f2d6c48c1a28a84543d72d70b <aa8aa16ed9adf1df05bb339d588cf485a011839e
  7. Affected versionversion=9996508b3353063f2d6c48c1a28a84543d72d70b <c6a8111aacbfe7a8a70f46cc0de8eed00561693c
  8. Affected versionversion=9996508b3353063f2d6c48c1a28a84543d72d70b <eafd83b92f6c044007a3591cbd476bcf90455990
  9. Affected versionversion=9996508b3353063f2d6c48c1a28a84543d72d70b <ecabe8cd456d3bf81e92c53b074732f3140f170d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.33; version=9996508b3353063f2d6c48c1a28a84543d72d70b <26cc6d7006f922df6cc4389248032d955750b2a0; version=9996508b3353063f2d6c48c1a28a84543d72d70b <5030d4c798863ccb266563201b341a099e8cdd48; version=9996508b3353063f2d6c48c1a28a84543d72d70b <6822a14271786150e178869f1495cc03e74c5029; version=9996508b3353063f2d6c48c1a28a84543d72d70b <78aafb3884f6bc6636efcc1760c891c8500b9922; version=9996508b3353063f2d6c48c1a28a84543d72d70b <aa8aa16ed9adf1df05bb339d588cf485a011839e; version=9996508b3353063f2d6c48c1a28a84543d72d70b <c6a8111aacbfe7a8a70f46cc0de8eed00561693c; version=9996508b3353063f2d6c48c1a28a84543d72d70b <eafd83b92f6c044007a3591cbd476bcf90455990; version=9996508b3353063f2d6c48c1a28a84543d72d70b <ecabe8cd456d3bf81e92c53b074732f3140f170d

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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-667Improper Locking

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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