CVE-2022-50406

Memory corruption via unlocked writeback mapping dereference

Published Sep 18, 2025 · Updated Sep 18, 2025

Use-after-free in Linux kernel 4.6 through 6.0.2 allows local users to corrupt memory when iomap writeback encounters an error. iomap_writepage_map dereferences folio->mapping after unlocking the folio, allowing another thread to remove and reallocate the page before mapping_set_error uses the pointer. Reaching the flaw requires a writeback error and a page-cache race; the result can be a system crash, memory corruption, or an error recorded against an unrelated file.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel 4.6 through 6.0.2 allows local users to corrupt memory when iomap writeback encounters an error. iomap_writepage_map dereferences folio->mapping after unlocking the folio, allowing another thread to remove and reallocate the page before mapping_set_error uses the pointer. Reaching the flaw requires a writeback error and a page-cache race; the result can be a system crash, memory corruption, or an error recorded against an unrelated file.

The record

CVE
CVE-2022-50406
Published
Sep 18, 2025
Updated
Sep 18, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2025Record 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=150d5be09ce49a9bed6feb7b7dc4e5ae188778ec <3d5f3ba1ac28059bdf7000cae2403e4e984308d2
  2. Affected versionversion=150d5be09ce49a9bed6feb7b7dc4e5ae188778ec <7308591d9c7787aec58f6a01a7823f14e90db7a2
  3. Affected versionversion=150d5be09ce49a9bed6feb7b7dc4e5ae188778ec <82c66c46f73b88be74c869e2cbfef45281adf3c6
  4. Affected versionversion=4.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=150d5be09ce49a9bed6feb7b7dc4e5ae188778ec <3d5f3ba1ac28059bdf7000cae2403e4e984308d2; version=150d5be09ce49a9bed6feb7b7dc4e5ae188778ec <7308591d9c7787aec58f6a01a7823f14e90db7a2; version=150d5be09ce49a9bed6feb7b7dc4e5ae188778ec <82c66c46f73b88be74c869e2cbfef45281adf3c6; version=4.6

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-787Out-of-bounds Write

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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