CVE-2022-50496

Kernel use-after-free via uncanceled dm-cache waker

Published Oct 4, 2025 · Updated Oct 4, 2025

Use-after-free in Linux dm-cache allows local users to access freed kernel memory by racing cache resume against destruction. The destroy() path frees cache state without first synchronously canceling the delayed waker scheduled during dm_resume(). Reaching the race requires privileged control of the device-mapper cache lifecycle; public records establish no specific consequence beyond kernel memory misuse.

CVSS severity7.8
High
EPSS probability0.17%
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 dm-cache allows local users to access freed kernel memory by racing cache resume against destruction. The destroy() path frees cache state without first synchronously canceling the delayed waker scheduled during dm_resume(). Reaching the race requires privileged control of the device-mapper cache lifecycle; public records establish no specific consequence beyond kernel memory misuse.

The record

CVE
CVE-2022-50496
Published
Oct 4, 2025
Updated
Oct 4, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.9
  2. Affected versionversion=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <034cbc8d3b47a56acd89453c29632a9c117de09d
  3. Affected versionversion=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <2b17026685a270b2beaf1cdd9857fcedd3505c7e
  4. Affected versionversion=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <2f097dfac7579fd84ff98eb1d3acd41d53a485f3
  5. Affected versionversion=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <4d20032dd90664de09f2902a7ea49ae2f7771746
  6. Affected versionversion=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <6a3e412c2ab131c54945327a7676b006f000a209
  7. Affected versionversion=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <6a459d8edbdbe7b24db42a5a9f21e6aa9e00c2aa
  8. Affected versionversion=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <6ac4f36910764cb510bafc4c3768544f86ca48ca
  9. Affected versionversion=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <993406104d2b28fe470126a062ad37a1e21e792e
  10. Affected versionversion=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <d2a0b298ebf83ab6236f66788a3541e91ce75a70

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.9; version=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <034cbc8d3b47a56acd89453c29632a9c117de09d; version=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <2b17026685a270b2beaf1cdd9857fcedd3505c7e; version=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <2f097dfac7579fd84ff98eb1d3acd41d53a485f3; version=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <4d20032dd90664de09f2902a7ea49ae2f7771746; version=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <6a3e412c2ab131c54945327a7676b006f000a209; version=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <6a459d8edbdbe7b24db42a5a9f21e6aa9e00c2aa; version=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <6ac4f36910764cb510bafc4c3768544f86ca48ca; version=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <993406104d2b28fe470126a062ad37a1e21e792e; version=c6b4fcbad044e6fffcc75bba160e720eb8d67d17 <d2a0b298ebf83ab6236f66788a3541e91ce75a70

Published CVSS scores

6.4SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS: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-416Use After Free

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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