CVE-2023-52582

Kernel crash via repeated folio cache start

Published Mar 2, 2024 · Updated May 11, 2026

Denial of service in Linux kernel netfs allows local users to trigger a kernel oops through a cached network-filesystem read. The netfs_rreq_unlock_folios function calls folio_start_fscache more than once for the same folio when clamp_length creates sub-page subrequests, tripping the private_2 assertion. Reachability requires a cached network filesystem using netfs and sub-page request lengths; the resulting kernel oops interrupts the system rather than exposing or altering data.

CVSS severity5.5
Medium
EPSS probability0.23%
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 Linux kernel netfs allows local users to trigger a kernel oops through a cached network-filesystem read. The netfs_rreq_unlock_folios function calls folio_start_fscache more than once for the same folio when clamp_length creates sub-page subrequests, tripping the private_2 assertion. Reachability requires a cached network filesystem using netfs and sub-page request lengths; the resulting kernel oops interrupts the system rather than exposing or altering data.

The record

CVE
CVE-2023-52582
Published
Mar 2, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 2, 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=3d3c95046742e4eebaa4b891b0b01cbbed94ebbd <d9f5537479d4ec97ea92ff24e81a517d5772581a
  2. Affected versionversion=3d3c95046742e4eebaa4b891b0b01cbbed94ebbd <df1c357f25d808e30b216188330e708e09e1a412
  3. Affected versionversion=3d3c95046742e4eebaa4b891b0b01cbbed94ebbd <df9950d37df113db59495fa09d060754366a2b7c
  4. Affected versionversion=5.13

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3d3c95046742e4eebaa4b891b0b01cbbed94ebbd <d9f5537479d4ec97ea92ff24e81a517d5772581a; version=3d3c95046742e4eebaa4b891b0b01cbbed94ebbd <df1c357f25d808e30b216188330e708e09e1a412; version=3d3c95046742e4eebaa4b891b0b01cbbed94ebbd <df9950d37df113db59495fa09d060754366a2b7c; version=5.13

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.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application 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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