CVE-2023-53207

Local kernel crash via interrupted ublk recovery

Published Sep 15, 2025 · Updated Sep 15, 2025

Improper recovery handling in the Linux kernel allows local users to trigger a kernel oops through the ublk control device. In ublk_ctrl_end_recovery(), an interruptible wait can return on a signal before all queues are ready, yet affected code continues UBLK_CMD_END_USER_RECOVERY instead of returning an error. A local low-privileged process must reach an enabled ublk user-recovery flow and interrupt queue setup; the resulting oops can crash the host.

CVSS severity5.5
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper recovery handling in the Linux kernel allows local users to trigger a kernel oops through the ublk control device. In ublk_ctrl_end_recovery(), an interruptible wait can return on a signal before all queues are ready, yet affected code continues UBLK_CMD_END_USER_RECOVERY instead of returning an error. A local low-privileged process must reach an enabled ublk user-recovery flow and interrupt queue setup; the resulting oops can crash the host.

The record

CVE
CVE-2023-53207
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=6.1
  2. Affected versionversion=c732a852b419fa057b53657e2daaf9433940391c <0c0cbd4ebc375ceebc75c89df04b74f215fab23a
  3. Affected versionversion=c732a852b419fa057b53657e2daaf9433940391c <84415f934ad4e96f3507fd09b831953d60fb04ec
  4. Affected versionversion=c732a852b419fa057b53657e2daaf9433940391c <b3a1e243a74632f88b22e713f1c7256754017d58

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1; version=c732a852b419fa057b53657e2daaf9433940391c <0c0cbd4ebc375ceebc75c89df04b74f215fab23a; version=c732a852b419fa057b53657e2daaf9433940391c <84415f934ad4e96f3507fd09b831953d60fb04ec; version=c732a852b419fa057b53657e2daaf9433940391c <b3a1e243a74632f88b22e713f1c7256754017d58

Published CVSS scores

5.5CISA-ADPCVSS: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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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