CVE-2026-63873

Kernel resource leak via missing mmput calls

Published Jul 19, 2026 · Updated Jul 19, 2026

Resource leak in the amdxdna driver in Linux Kernel 6.16 allows local users to retain mm_struct references during NPU memory mapping. In aie2_populate_range(), retry paths jump to again after dropping the mapping reference but omit mmput(mm), so each pass retains the process memory descriptor. Reachability requires an AMD NPU managed by amdxdna and a workload path that triggers a retry; the published record identifies no crash, hang, privilege change, or data impact.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource leak in the amdxdna driver in Linux Kernel 6.16 allows local users to retain mm_struct references during NPU memory mapping. In aie2_populate_range(), retry paths jump to again after dropping the mapping reference but omit mmput(mm), so each pass retains the process memory descriptor. Reachability requires an AMD NPU managed by amdxdna and a workload path that triggers a retry; the published record identifies no crash, hang, privilege change, or data impact.

The record

CVE
CVE-2026-63873
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=6.16
  2. Affected versionversion=e486147c912f653ef4b60a6c7dbd4168a4c56a9f <21dfec59939120b20d2c7794caaa421f9450be0a
  3. Affected versionversion=e486147c912f653ef4b60a6c7dbd4168a4c56a9f <2f41af638c92bac6f1f9275ea2d1901baef578f3
  4. Affected versionversion=e486147c912f653ef4b60a6c7dbd4168a4c56a9f <e83fc4c28226be75fbc0c41f2846935ba2b5f949

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.16; version=e486147c912f653ef4b60a6c7dbd4168a4c56a9f <21dfec59939120b20d2c7794caaa421f9450be0a; version=e486147c912f653ef4b60a6c7dbd4168a4c56a9f <2f41af638c92bac6f1f9275ea2d1901baef578f3; version=e486147c912f653ef4b60a6c7dbd4168a4c56a9f <e83fc4c28226be75fbc0c41f2846935ba2b5f949

Published CVSS scores

No CVSS assessment is available in this record.

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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