CVE-2024-46838

Local denial of service via stale page-table assertions

Published Sep 27, 2024 · Updated May 11, 2026

Denial of service in Linux kernel 6.6 through 6.10.9 allows local users to crash the system through a userfaultfd race. In mfill_atomic(), khugepaged can retract a shared-memory page table without holding the mmap lock after preliminary checks, yet two BUG_ON assertions assume dst_pmd is neither absent nor a transparent huge page. A low-privileged local process able to exercise userfaultfd on a shmem mapping can win the race and trigger a kernel BUG, interrupting the host.

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 6.6 through 6.10.9 allows local users to crash the system through a userfaultfd race. In mfill_atomic(), khugepaged can retract a shared-memory page table without holding the mmap lock after preliminary checks, yet two BUG_ON assertions assume dst_pmd is neither absent nor a transparent huge page. A low-privileged local process able to exercise userfaultfd on a shmem mapping can win the race and trigger a kernel BUG, interrupting the host.

The record

CVE
CVE-2024-46838
Published
Sep 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 27, 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=1d65b771bc08cd054cf6d3766a72e113dc46d62f <4828d207dc5161dc7ddf9a4f6dcfd80c7dd7d20a
  2. Affected versionversion=1d65b771bc08cd054cf6d3766a72e113dc46d62f <4a594acc12d5954cdc71d4450a386748bf3d136a
  3. Affected versionversion=1d65b771bc08cd054cf6d3766a72e113dc46d62f <db978287e908d48b209e374b00d847b2d785e0a9
  4. Affected versionversion=6.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1d65b771bc08cd054cf6d3766a72e113dc46d62f <4828d207dc5161dc7ddf9a4f6dcfd80c7dd7d20a; version=1d65b771bc08cd054cf6d3766a72e113dc46d62f <4a594acc12d5954cdc71d4450a386748bf3d136a; version=1d65b771bc08cd054cf6d3766a72e113dc46d62f <db978287e908d48b209e374b00d847b2d785e0a9; 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

T1499Endpoint Denial of Service

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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