CVE-2024-42243Public exploit

Local service interruption via unsupported page-cache order

Published Aug 7, 2024 · Updated May 11, 2026

Availability failure in affected Linux kernels allows local users to trigger a kernel warning through oversized page-cache folios. xas_split_alloc attempts to split a folio order that xarray cannot represent because MAX_PAGECACHE_ORDER permits PMD-sized page-cache folios beyond xarray's supported limit. Reachability requires an ARM64 system with 64 KB base pages and 512 MB huge pages plus XFS or shmem page-cache activity; panic_on_warn turns the warning into a kernel panic and service interruption.

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

Availability failure in affected Linux kernels allows local users to trigger a kernel warning through oversized page-cache folios. xas_split_alloc attempts to split a folio order that xarray cannot represent because MAX_PAGECACHE_ORDER permits PMD-sized page-cache folios beyond xarray's supported limit. Reachability requires an ARM64 system with 64 KB base pages and 512 MB huge pages plus XFS or shmem page-cache activity; panic_on_warn turns the warning into a kernel panic and service interruption.

The record

CVE
CVE-2024-42243
Published
Aug 7, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 7, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.18
  2. Affected versionversion=793917d997df2e432f3e9ac126e4482d68256d01 <099d90642a711caae377f53309abfe27e8724a8b
  3. Affected versionversion=793917d997df2e432f3e9ac126e4482d68256d01 <333c5539a31f48828456aa9997ec2808f06a699a
  4. Affected versionversion=793917d997df2e432f3e9ac126e4482d68256d01 <a0c42ddd0969fdc760a85e20e267776028a7ca4e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=793917d997df2e432f3e9ac126e4482d68256d01 <099d90642a711caae377f53309abfe27e8724a8b; version=793917d997df2e432f3e9ac126e4482d68256d01 <333c5539a31f48828456aa9997ec2808f06a699a; version=793917d997df2e432f3e9ac126e4482d68256d01 <a0c42ddd0969fdc760a85e20e267776028a7ca4e

Published CVSS scores

5.5NISTCVSS: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 exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

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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