CVE-2026-45975

Service interruption via racy ublk control reads

Published May 27, 2026 · Updated May 27, 2026

Race condition in the Linux Kernel ublk driver 6.19 through 6.19.3 allows local users to interrupt service via crafted io_uring commands. The driver repeatedly loads ublksrv_ctrl_cmd fields from a userspace-mapped io_uring submission entry, allowing concurrent writes to produce an inconsistent command snapshot. Exploitation requires low-privilege local access and a reachable ublk control path; the public record establishes service interruption but does not specify whether it is a hang or crash.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux Kernel ublk driver 6.19 through 6.19.3 allows local users to interrupt service via crafted io_uring commands. The driver repeatedly loads ublksrv_ctrl_cmd fields from a userspace-mapped io_uring submission entry, allowing concurrent writes to produce an inconsistent command snapshot. Exploitation requires low-privilege local access and a reachable ublk control path; the public record establishes service interruption but does not specify whether it is a hang or crash.

The record

CVE
CVE-2026-45975
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 2026Record 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=6.19
  2. Affected versionversion=87213b0d847cd300285b5545598e0548baeb5208 <ce63eda3e6d36e2c253febee1c8421ecbd1a680e
  3. Affected versionversion=87213b0d847cd300285b5545598e0548baeb5208 <ed9f54cc1e335096733aed03c2a46de3d58922ed

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.19; version=87213b0d847cd300285b5545598e0548baeb5208 <ce63eda3e6d36e2c253febee1c8421ecbd1a680e; version=87213b0d847cd300285b5545598e0548baeb5208 <ed9f54cc1e335096733aed03c2a46de3d58922ed

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.0SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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

T1499Endpoint Denial of Service

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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