CVE-2026-53021

Service interruption via UNMAP bounds-check overflow

Published Jun 24, 2026 · Updated Jun 24, 2026

Integer overflow in the SCSI target core of Linux Kernel allows local users to interrupt service through a crafted UNMAP request. The sbc_execute_unmap() function adds the supplied LBA and range before comparing the result with device capacity, allowing the 64-bit sum to wrap and pass the bounds check. The published assessment requires local low-privileged access; the reported consequence is limited to availability.

CVSS severity5.5
Medium
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

Integer overflow in the SCSI target core of Linux Kernel allows local users to interrupt service through a crafted UNMAP request. The sbc_execute_unmap() function adds the supplied LBA and range before comparing the result with device capacity, allowing the 64-bit sum to wrap and pass the bounds check. The published assessment requires local low-privileged access; the reported consequence is limited to availability.

The record

CVE
CVE-2026-53021
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-190, T1499
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=3.10
  2. Affected versionversion=86d7182985d25900929adce14fffd729cc8c6fb8 <02115986d027ade793e7f6be87e91d6a796d0aa3
  3. Affected versionversion=86d7182985d25900929adce14fffd729cc8c6fb8 <2bf2d65f76697820dbc4227d13866293576dd90a
  4. Affected versionversion=86d7182985d25900929adce14fffd729cc8c6fb8 <2e1ed9a7b6ea5bfefb5d80a02b1c71c7dee1f0dd
  5. Affected versionversion=86d7182985d25900929adce14fffd729cc8c6fb8 <3facdecc3fcf115cc4f9b3d8f118d6705e2456a8
  6. Affected versionversion=86d7182985d25900929adce14fffd729cc8c6fb8 <51075df70c46e60a9773f2dcd28299e40dac36fb
  7. Affected versionversion=86d7182985d25900929adce14fffd729cc8c6fb8 <5efc3ef4758f8d98c257419fa21daca3227de61a
  8. Affected versionversion=86d7182985d25900929adce14fffd729cc8c6fb8 <c08ab702c4699c6efb9d60bdb15b73e7a627ee7e
  9. Affected versionversion=86d7182985d25900929adce14fffd729cc8c6fb8 <d7aef29573c7c5cdb2dfad939253287a6329c2a4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.10; version=86d7182985d25900929adce14fffd729cc8c6fb8 <02115986d027ade793e7f6be87e91d6a796d0aa3; version=86d7182985d25900929adce14fffd729cc8c6fb8 <2bf2d65f76697820dbc4227d13866293576dd90a; version=86d7182985d25900929adce14fffd729cc8c6fb8 <2e1ed9a7b6ea5bfefb5d80a02b1c71c7dee1f0dd; version=86d7182985d25900929adce14fffd729cc8c6fb8 <3facdecc3fcf115cc4f9b3d8f118d6705e2456a8; version=86d7182985d25900929adce14fffd729cc8c6fb8 <51075df70c46e60a9773f2dcd28299e40dac36fb; version=86d7182985d25900929adce14fffd729cc8c6fb8 <5efc3ef4758f8d98c257419fa21daca3227de61a; version=86d7182985d25900929adce14fffd729cc8c6fb8 <c08ab702c4699c6efb9d60bdb15b73e7a627ee7e; version=86d7182985d25900929adce14fffd729cc8c6fb8 <d7aef29573c7c5cdb2dfad939253287a6329c2a4

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.

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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-190Integer Overflow or Wraparound
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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