CVE-2023-53508

Kernel oops via interrupted queue setup

Published Oct 1, 2025 · Updated Oct 1, 2025

Denial of service in the Linux kernel ublk driver allows local users to trigger a kernel oops by interrupting device startup. ublk_ctrl_start_dev() continues after wait_for_completion_interruptible() returns on a signal, even though its request queues have not finished setup, instead of failing UBLK_CMD_START_DEV. Reachability requires local low-privileged access to start and signal a ublk server; the documented consequence is disruption from a kernel oops.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel ublk driver allows local users to trigger a kernel oops by interrupting device startup. ublk_ctrl_start_dev() continues after wait_for_completion_interruptible() returns on a signal, even though its request queues have not finished setup, instead of failing UBLK_CMD_START_DEV. Reachability requires local low-privileged access to start and signal a ublk server; the documented consequence is disruption from a kernel oops.

The record

CVE
CVE-2023-53508
Published
Oct 1, 2025
Updated
Oct 1, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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=6.0
  2. Affected versionversion=71f28f3136aff5890cd56de78abc673f8393cad9 <0d5916c439574b18a0734872daa0022b3d6105ad
  3. Affected versionversion=71f28f3136aff5890cd56de78abc673f8393cad9 <53e7d08f6d6e214c40db1f51291bb2975c789dc2
  4. Affected versionversion=71f28f3136aff5890cd56de78abc673f8393cad9 <6ab3e7d424cd413d7a5e976c8a30b4ffa84a65dd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=71f28f3136aff5890cd56de78abc673f8393cad9 <0d5916c439574b18a0734872daa0022b3d6105ad; version=71f28f3136aff5890cd56de78abc673f8393cad9 <53e7d08f6d6e214c40db1f51291bb2975c789dc2; version=71f28f3136aff5890cd56de78abc673f8393cad9 <6ab3e7d424cd413d7a5e976c8a30b4ffa84a65dd

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.1SUSECVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS: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

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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