CVE-2025-40036

Local resource leak via skipped FastRPC cleanup

Published Oct 28, 2025 · Updated Oct 28, 2025

Resource leak in the FastRPC driver in affected Linux kernel releases allows local users to retain mapped buffers after a failed copy. fastrpc_put_args returns immediately when copy_to_user fails, skipping the DSP-updated fdlist loop that releases mapped buffers. Reachability requires a user-space FastRPC invocation whose result-copy operation faults; each qualifying failure leaves mapped-buffer references unreleased.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
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 FastRPC driver in affected Linux kernel releases allows local users to retain mapped buffers after a failed copy. fastrpc_put_args returns immediately when copy_to_user fails, skipping the DSP-updated fdlist loop that releases mapped buffers. Reachability requires a user-space FastRPC invocation whose result-copy operation faults; each qualifying failure leaves mapped-buffer references unreleased.

The record

CVE
CVE-2025-40036
Published
Oct 28, 2025
Updated
Oct 28, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 2025Record 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=5.1
  2. Affected versionversion=c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 <3ad42dc66445df6977cf4be0c06f1a655299ce6c
  3. Affected versionversion=c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 <78d33a041555db03903e8037fd053ed74fbd88cb
  4. Affected versionversion=c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 <a085658264d0c8d4f795d4631f77d7289a021de9
  5. Affected versionversion=c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 <c000f65f0ac93d9f9cc69a230d372f6ca93e4879
  6. Affected versionversion=c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 <da1ba64176e0138f2bfa96f9e43e8c3640d01e1e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.1; version=c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 <3ad42dc66445df6977cf4be0c06f1a655299ce6c; version=c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 <78d33a041555db03903e8037fd053ed74fbd88cb; version=c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 <a085658264d0c8d4f795d4631f77d7289a021de9; version=c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 <c000f65f0ac93d9f9cc69a230d372f6ca93e4879; version=c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 <da1ba64176e0138f2bfa96f9e43e8c3640d01e1e

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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