CVE-2024-42251

Local kernel crash via non-atomic folio pinning

Published Aug 8, 2024 · Updated May 11, 2026

Reachable assertion in the Linux kernel allows local users to crash the host kernel through a process_vm_readv system call. On non-SMP builds, the get-user-pages slow path calls try_grab_folio outside atomic context, causing folio_ref_try_add_rcu to enforce its atomic-context assertion. A local user able to invoke process_vm_readv while pinning a transparent huge page can halt the host; SMP kernels do not take the faulty optimized path.

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

Reachable assertion in the Linux kernel allows local users to crash the host kernel through a process_vm_readv system call. On non-SMP builds, the get-user-pages slow path calls try_grab_folio outside atomic context, causing folio_ref_try_add_rcu to enforce its atomic-context assertion. A local user able to invoke process_vm_readv while pinning a transparent huge page can halt the host; SMP kernels do not take the faulty optimized path.

The record

CVE
CVE-2024-42251
Published
Aug 8, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-617, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 8, 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=57edfcfd3419b4799353d8cbd6ce49da075cfdbd <16380f52b72166d6a33b508cc2509716f436253f
  2. Affected versionversion=57edfcfd3419b4799353d8cbd6ce49da075cfdbd <e7db2762ea3e69f215b3ec4db666006deccc37b4
  3. Affected versionversion=57edfcfd3419b4799353d8cbd6ce49da075cfdbd <fa2690af573dfefb47ba6eef888797a64b6b5f3c
  4. Affected versionversion=6.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=57edfcfd3419b4799353d8cbd6ce49da075cfdbd <16380f52b72166d6a33b508cc2509716f436253f; version=57edfcfd3419b4799353d8cbd6ce49da075cfdbd <e7db2762ea3e69f215b3ec4db666006deccc37b4; version=57edfcfd3419b4799353d8cbd6ce49da075cfdbd <fa2690af573dfefb47ba6eef888797a64b6b5f3c; version=6.6

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

CWE-617Reachable Assertion
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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