CVE-2022-49991

Service interruption via corrupted huge-page mapping

Published Jun 18, 2025 · Updated Aug 5, 2026

Memory corruption in Linux before 5.15.65, 5.19.6, or 6.0 allows local users to interrupt service through a userfaultfd huge-page operation. In hugetlb_mcopy_atomic_pte, MCOPY_ATOMIC_CONTINUE installs a page-cache page into a non-shared VMA but wrongly applies an anonymous reverse mapping, corrupting page->mapping. Low-privileged local access is required, and the published CVSS assessment limits the demonstrated consequence to availability loss.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Linux before 5.15.65, 5.19.6, or 6.0 allows local users to interrupt service through a userfaultfd huge-page operation. In hugetlb_mcopy_atomic_pte, MCOPY_ATOMIC_CONTINUE installs a page-cache page into a non-shared VMA but wrongly applies an anonymous reverse mapping, corrupting page->mapping. Low-privileged local access is required, and the published CVSS assessment limits the demonstrated consequence to availability loss.

The record

CVE
CVE-2022-49991
Published
Jun 18, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.13
  2. Affected versionversion=f619147104c8ea71e120e4936d2b68ec11a1e527 <3ada1b3e58db255a14ec73a59d7913e84dc5a8a4
  3. Affected versionversion=f619147104c8ea71e120e4936d2b68ec11a1e527 <ab74ef708dc51df7cf2b8a890b9c6990fac5c0c6
  4. Affected versionversion=f619147104c8ea71e120e4936d2b68ec11a1e527 <da60ddd80d09f8371fbba1a238a4b318d13ba698

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=f619147104c8ea71e120e4936d2b68ec11a1e527 <3ada1b3e58db255a14ec73a59d7913e84dc5a8a4; version=f619147104c8ea71e120e4936d2b68ec11a1e527 <ab74ef708dc51df7cf2b8a890b9c6990fac5c0c6; version=f619147104c8ea71e120e4936d2b68ec11a1e527 <da60ddd80d09f8371fbba1a238a4b318d13ba698

Published CVSS scores

5.5NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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