CVE-2026-53124

Local I/O hang via stale cancellation flags

Published Jun 24, 2026 · Updated Jun 24, 2026

Denial of service in Linux Kernel 6.14.6 through 6.15 allows local users to hang ublk command cancellation during recovery. During recovery, per-command canceled flags are cleared only after every queued operation is fetched, so a partial fetch leaves flags set and makes ublk_cancel_cmd skip io_uring_cmd_done. Triggering requires a ublk server to die after fetching a nonempty proper subset of queued operations; the resulting outstanding commands remain uncanceled.

CVSS severity5.5
Medium
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Linux Kernel 6.14.6 through 6.15 allows local users to hang ublk command cancellation during recovery. During recovery, per-command canceled flags are cleared only after every queued operation is fetched, so a partial fetch leaves flags set and makes ublk_cancel_cmd skip io_uring_cmd_done. Triggering requires a ublk server to die after fetching a nonempty proper subset of queued operations; the resulting outstanding commands remain uncanceled.

The record

CVE
CVE-2026-53124
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1489
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=42ea64e01c96e594fb4f80c54dfe4f934d008a6e
  2. Affected versionversion=6.14.6 <6.15
  3. Affected versionversion=6.15
  4. Affected versionversion=728cbac5fe219d3b8a21a0688a08f2b7f8aeda2b <0842186d2c4e67d2f8c8c2d1d779e8acffd41b5b
  5. Affected versionversion=728cbac5fe219d3b8a21a0688a08f2b7f8aeda2b <63335e5a67d89bb7cb9b023bbb3785896587a648

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=42ea64e01c96e594fb4f80c54dfe4f934d008a6e; version=6.14.6 <6.15; version=6.15; version=728cbac5fe219d3b8a21a0688a08f2b7f8aeda2b <0842186d2c4e67d2f8c8c2d1d779e8acffd41b5b; version=728cbac5fe219d3b8a21a0688a08f2b7f8aeda2b <63335e5a67d89bb7cb9b023bbb3785896587a648

Published CVSS scores

5.5NIST NVDCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1489Service Stop

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo