CVE-2023-53501

Local service interruption via PASID unbind race

Published Oct 1, 2025 · Updated May 11, 2026

Race condition in the AMD IOMMU v2 driver in Linux allows local users to interrupt service by unbinding a PASID during page faults. The pasid_state reference count is decremented with refcount_dec at unbind even when its value is one, provoking a zero-count warning and leaking the object. Exploitation requires local low-privileged access, AMD IOMMU v2 PASID use, and a concurrent outstanding page fault; the reported consequence is availability loss rather than data access.

CVSS severity4.7
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

Race condition in the AMD IOMMU v2 driver in Linux allows local users to interrupt service by unbinding a PASID during page faults. The pasid_state reference count is decremented with refcount_dec at unbind even when its value is one, provoking a zero-count warning and leaking the object. Exploitation requires local low-privileged access, AMD IOMMU v2 PASID use, and a concurrent outstanding page fault; the reported consequence is availability loss rather than data access.

The record

CVE
CVE-2023-53501
Published
Oct 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 1, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record 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=5.15
  2. Affected versionversion=8bc54824da4e8fcf0ed679cf09ac32f23d83254a <13ed255248dfbbb7f23f9170c7a537fb9ca22c73
  3. Affected versionversion=8bc54824da4e8fcf0ed679cf09ac32f23d83254a <534103bcd52ca9c1fecbc70e717b4a538dc4ded8
  4. Affected versionversion=8bc54824da4e8fcf0ed679cf09ac32f23d83254a <98d86bf32187db27946ca817c2467a5f2f7aa02f
  5. Affected versionversion=8bc54824da4e8fcf0ed679cf09ac32f23d83254a <9ccc51be3126b25cfe9351dbffde946c925cc28a
  6. Affected versionversion=8bc54824da4e8fcf0ed679cf09ac32f23d83254a <a50d60b8f2aff46dd7c7edb4a5835cdc4d432c22

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=8bc54824da4e8fcf0ed679cf09ac32f23d83254a <13ed255248dfbbb7f23f9170c7a537fb9ca22c73; version=8bc54824da4e8fcf0ed679cf09ac32f23d83254a <534103bcd52ca9c1fecbc70e717b4a538dc4ded8; version=8bc54824da4e8fcf0ed679cf09ac32f23d83254a <98d86bf32187db27946ca817c2467a5f2f7aa02f; version=8bc54824da4e8fcf0ed679cf09ac32f23d83254a <9ccc51be3126b25cfe9351dbffde946c925cc28a; version=8bc54824da4e8fcf0ed679cf09ac32f23d83254a <a50d60b8f2aff46dd7c7edb4a5835cdc4d432c22

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/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 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

T1499Endpoint Denial of Service

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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