CVE-2026-22995

Kernel memory corruption via ublk teardown race

Published Jan 23, 2026 · Updated Jan 23, 2026

Use-after-free in Linux Kernel 6.18.4 through 6.18.5 and 6.19-rc4 allows local users to corrupt kernel memory during ublk teardown. ublk_partition_scan_work dereferences ub->ub_disk after concurrent teardown detaches the pointer and put_disk releases the disk object. Triggering the flaw requires control of a ublk device and a partition scan that races device removal; the resulting corruption can crash the host or alter protected data.

CVSS severity7.8
High
EPSS probability0.12%
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 6.18.4 through 6.18.5 and 6.19-rc4 allows local users to corrupt kernel memory during ublk teardown. ublk_partition_scan_work dereferences ub->ub_disk after concurrent teardown detaches the pointer and put_disk releases the disk object. Triggering the flaw requires control of a ublk device and a partition scan that races device removal; the resulting corruption can crash the host or alter protected data.

The record

CVE
CVE-2026-22995
Published
Jan 23, 2026
Updated
Jan 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 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=6.19-rc4
  2. Affected versionversion=63dfbcd59b4b823eac4441efff10b1c303c8f49f <72e28774e9644c2bdbb4920842fbf77103a15a85
  3. Affected versionversion=7fc4da6a304bdcd3de14fc946dc2c19437a9cc5a <f0d385f6689f37a2828c686fb279121df006b4cb

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19-rc4; version=63dfbcd59b4b823eac4441efff10b1c303c8f49f <72e28774e9644c2bdbb4920842fbf77103a15a85; version=7fc4da6a304bdcd3de14fc946dc2c19437a9cc5a <f0d385f6689f37a2828c686fb279121df006b4cb

Published CVSS scores

7.8Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/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
T1499.004Application or System Exploitation

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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