CVE-2023-52895

Local denial of service via multishot poll reissue

Published Aug 21, 2024 · Updated May 11, 2026

Resource leak in io_uring polling in Linux kernel 6.1.7 allows local users to exhaust kernel memory through a multishot request race. io_uring/poll.c reissues an already armed multishot request after a spurious wakeup and loses a ring-provided buffer. Reachability requires a low-privileged local process to submit multishot polling with provided buffers and win the poll race; repeated leaks interrupt service.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in io_uring polling in Linux kernel 6.1.7 allows local users to exhaust kernel memory through a multishot request race. io_uring/poll.c reissues an already armed multishot request after a spurious wakeup and loses a ring-provided buffer. Reachability requires a low-privileged local process to submit multishot polling with provided buffers and win the poll race; repeated leaks interrupt service.

The record

CVE
CVE-2023-52895
Published
Aug 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 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=6.1.7 <6.1.8
  2. Affected versionversion=6e5aedb9324aab1c14a23fae3d8eeb64a679c20e <8caa03f10bf92cb8657408a6ece6a8a73f96ce13
  3. Affected versionversion=c06015ebc4367be38904b88582e13cc079672075 <36fc7317cdb16cfeae0f879916995037bb615ac4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1.7 <6.1.8; version=6e5aedb9324aab1c14a23fae3d8eeb64a679c20e <8caa03f10bf92cb8657408a6ece6a8a73f96ce13; version=c06015ebc4367be38904b88582e13cc079672075 <36fc7317cdb16cfeae0f879916995037bb615ac4

Published CVSS scores

5.5NIST NVDCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
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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