CVE-2025-40175

Service interruption via unreleased PTP packet references

Published Nov 12, 2025 · Updated May 11, 2026

Resource leak in the Linux kernel idpf driver 6.16 through 6.17.4 and 6.18-rc1 allows local users to exhaust memory through PTP resets. The idpf_ptp_release_vport_tstamp function frees in-use timestamp-latch trackers without consuming their skb references, leaving skb_get clones allocated. The condition requires idpf hardware with transmit timestamping enabled, an outstanding timestamp request, and a driver reset; repeated leaks can interrupt service.

CVSS severity5.7
Medium
EPSS probability0.17%
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 Linux kernel idpf driver 6.16 through 6.17.4 and 6.18-rc1 allows local users to exhaust memory through PTP resets. The idpf_ptp_release_vport_tstamp function frees in-use timestamp-latch trackers without consuming their skb references, leaving skb_get clones allocated. The condition requires idpf hardware with transmit timestamping enabled, an outstanding timestamp request, and a driver reset; repeated leaks can interrupt service.

The record

CVE
CVE-2025-40175
Published
Nov 12, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 12, 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=4901e83a94ef0a8baf27916f31daf59b0a68547f <2c84e91ef831d4fedb0b94670b3cfd1cc5f966a5
  2. Affected versionversion=4901e83a94ef0a8baf27916f31daf59b0a68547f <a3f8c0a273120fd2638f03403e786c3de2382e72
  3. Affected versionversion=6.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4901e83a94ef0a8baf27916f31daf59b0a68547f <2c84e91ef831d4fedb0b94670b3cfd1cc5f966a5; version=4901e83a94ef0a8baf27916f31daf59b0a68547f <a3f8c0a273120fd2638f03403e786c3de2382e72; version=6.16

Published CVSS scores

5.7SUSECVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
4.7SUSECVSS: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 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

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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