CVE-2022-50563

Kernel memory corruption via thin-pool timer race

Published Oct 22, 2025 · Updated Oct 22, 2025

A use-after-free in the Linux kernel device-mapper thin target allows local users to corrupt kernel memory through concurrent pool operations. The dm_resume path schedules a pool timer while concurrent dm_destroy skips cancellation for a suspended device, frees the pool, and leaves run_timer_softirq to write through the stale timer. Reachability requires local control of thin-pool suspend, resume, and removal operations; the demonstrated result is a KASAN-detected write after the pool is freed.

CVSS severityUnavailable
Unscored
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

A use-after-free in the Linux kernel device-mapper thin target allows local users to corrupt kernel memory through concurrent pool operations. The dm_resume path schedules a pool timer while concurrent dm_destroy skips cancellation for a suspended device, frees the pool, and leaves run_timer_softirq to write through the stale timer. Reachability requires local control of thin-pool suspend, resume, and removal operations; the demonstrated result is a KASAN-detected write after the pool is freed.

The record

CVE
CVE-2022-50563
Published
Oct 22, 2025
Updated
Oct 22, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 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=3.2
  2. Affected versionversion=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <34cd15d83b7206188d440b29b68084fcafde9395
  3. Affected versionversion=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <34fe9c2251f19786a6689149a6212c6c0de1d63b
  4. Affected versionversion=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <550a4fac7ecfee5bac6a0dd772456ca62fb72f46
  5. Affected versionversion=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <7ae6aa649394e1e7f6dafb55ce0d578c0572a280
  6. Affected versionversion=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <7ee059d06a5d3c15465959e0472993e80fbe4e81
  7. Affected versionversion=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <88430ebcbc0ec637b710b947738839848c20feff
  8. Affected versionversion=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <94e231c9d6f2648d2f1f68e7f476e050ee0a6159
  9. Affected versionversion=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <d9971fa4d8bde63d49c743c1b32d12fbbd3a30bd
  10. Affected versionversion=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <e8b8e0d2bbf7d1172c4f435621418e29ee408d46

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.2; version=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <34cd15d83b7206188d440b29b68084fcafde9395; version=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <34fe9c2251f19786a6689149a6212c6c0de1d63b; version=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <550a4fac7ecfee5bac6a0dd772456ca62fb72f46; version=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <7ae6aa649394e1e7f6dafb55ce0d578c0572a280; version=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <7ee059d06a5d3c15465959e0472993e80fbe4e81; version=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <88430ebcbc0ec637b710b947738839848c20feff; version=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <94e231c9d6f2648d2f1f68e7f476e050ee0a6159; version=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <d9971fa4d8bde63d49c743c1b32d12fbbd3a30bd; version=991d9fa02da0dd1f843dc011376965e0c8c6c9b5 <e8b8e0d2bbf7d1172c4f435621418e29ee408d46

Published CVSS scores

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
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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