CVE-2022-50843

Invalid kernel memory access via uncanceled delayed work

Published Dec 30, 2025 · Updated Dec 30, 2025

A use-after-free in the Linux kernel dm-clone target allows local users to access freed memory during concurrent resume and teardown. The clone_dtr function destroys dm-clone resources without first synchronously canceling clone->waker, so queued work can run after teardown. A configured dm-clone target and a race between dm_resume and dm_destroy are required; published sources establish no outcome beyond the invalid memory access.

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

A use-after-free in the Linux kernel dm-clone target allows local users to access freed memory during concurrent resume and teardown. The clone_dtr function destroys dm-clone resources without first synchronously canceling clone->waker, so queued work can run after teardown. A configured dm-clone target and a race between dm_resume and dm_destroy are required; published sources establish no outcome beyond the invalid memory access.

The record

CVE
CVE-2022-50843
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 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=5.4
  2. Affected versionversion=7431b7835f554f8608b415a02cf3c3f086309e02 <342cfd8426dff4228e6c714bcb9fc8295a2748dd
  3. Affected versionversion=7431b7835f554f8608b415a02cf3c3f086309e02 <520b56cfd9faee7683f081c3a38f11a81b13a68e
  4. Affected versionversion=7431b7835f554f8608b415a02cf3c3f086309e02 <856edd0e92f3fe89606b704c86a93daedddfe6ec
  5. Affected versionversion=7431b7835f554f8608b415a02cf3c3f086309e02 <9e113cd4f61f3b0000843b2d0a90ce8b40a1fcff
  6. Affected versionversion=7431b7835f554f8608b415a02cf3c3f086309e02 <b1ddb666073bb5f36390aaabaa1a4d48d78c52ed
  7. Affected versionversion=7431b7835f554f8608b415a02cf3c3f086309e02 <e4b5957c6f749a501c464f92792f1c8e26b61a94

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=7431b7835f554f8608b415a02cf3c3f086309e02 <342cfd8426dff4228e6c714bcb9fc8295a2748dd; version=7431b7835f554f8608b415a02cf3c3f086309e02 <520b56cfd9faee7683f081c3a38f11a81b13a68e; version=7431b7835f554f8608b415a02cf3c3f086309e02 <856edd0e92f3fe89606b704c86a93daedddfe6ec; version=7431b7835f554f8608b415a02cf3c3f086309e02 <9e113cd4f61f3b0000843b2d0a90ce8b40a1fcff; version=7431b7835f554f8608b415a02cf3c3f086309e02 <b1ddb666073bb5f36390aaabaa1a4d48d78c52ed; version=7431b7835f554f8608b415a02cf3c3f086309e02 <e4b5957c6f749a501c464f92792f1c8e26b61a94

Published CVSS scores

5.5SUSECVSS: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 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

No sourced classifications are available.

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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