CVE-2022-48802Public exploit

Kernel crash via migration-entry mapcount race

Published Jul 16, 2024 · Updated May 11, 2026

Race condition in the Linux kernel allows local users to crash the kernel by racing a procfs smaps read with MADV_FREE. In fs/proc/task_mmu.c, smaps_account() calls page_mapcount() on a migration entry while a partial transparent huge page can be split, leaving PageDoubleMap() to inspect a page that is no longer a tail page and trigger a BUG. The race requires local execution that can read /proc/$PID/smaps while issuing MADV_FREE; the demonstrated consequence is a kernel crash, with no reported confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel allows local users to crash the kernel by racing a procfs smaps read with MADV_FREE. In fs/proc/task_mmu.c, smaps_account() calls page_mapcount() on a migration entry while a partial transparent huge page can be split, leaving PageDoubleMap() to inspect a page that is no longer a tail page and trigger a BUG. The race requires local execution that can read /proc/$PID/smaps while issuing MADV_FREE; the demonstrated consequence is a kernel crash, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2022-48802
Published
Jul 16, 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. Jul 16, 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=4.5
  2. Affected versionversion=e9b61f19858a5d6c42ce2298cf138279375d0d9b <05d3f8045efa59457b323caf00bdb9273b7962fa
  3. Affected versionversion=e9b61f19858a5d6c42ce2298cf138279375d0d9b <24d7275ce2791829953ed4e72f68277ceb2571c6
  4. Affected versionversion=e9b61f19858a5d6c42ce2298cf138279375d0d9b <a8dd0cfa37792863b6c4bf9542975212a6715d49
  5. Affected versionversion=e9b61f19858a5d6c42ce2298cf138279375d0d9b <db3f3636e4aed2cba3e4e7897a053323f7a62249

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.5; version=e9b61f19858a5d6c42ce2298cf138279375d0d9b <05d3f8045efa59457b323caf00bdb9273b7962fa; version=e9b61f19858a5d6c42ce2298cf138279375d0d9b <24d7275ce2791829953ed4e72f68277ceb2571c6; version=e9b61f19858a5d6c42ce2298cf138279375d0d9b <a8dd0cfa37792863b6c4bf9542975212a6715d49; version=e9b61f19858a5d6c42ce2298cf138279375d0d9b <db3f3636e4aed2cba3e4e7897a053323f7a62249

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

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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

T1499.004Application or System Exploitation

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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