CVE-2025-39855

Local system crash via timestamp tracker race

Published Sep 19, 2025 · Updated Sep 19, 2025

Race condition in the Linux kernel ice driver allows local users to crash the system during an E810 Tx timestamp interrupt. ice_ptp_ts_irq reads the ice_ptp_tx in_use bitmap without first confirming that the tracker remains initialized, enabling a NULL dereference or use-after-free. Reachability requires E810 low-latency Tx timestamp handling to race with driver reset teardown.

CVSS severity7.8
High
EPSS probability0.16%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel ice driver allows local users to crash the system during an E810 Tx timestamp interrupt. ice_ptp_ts_irq reads the ice_ptp_tx in_use bitmap without first confirming that the tracker remains initialized, enabling a NULL dereference or use-after-free. Reachability requires E810 low-latency Tx timestamp handling to race with driver reset teardown.

The record

CVE
CVE-2025-39855
Published
Sep 19, 2025
Updated
Sep 19, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 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=6.15
  2. Affected versionversion=f9472aaabd1f38954938838a1146db4855ad88e8 <1467a873b20110263cc9c93de99335d139c11e16
  3. Affected versionversion=f9472aaabd1f38954938838a1146db4855ad88e8 <403bf043d9340196e06769065169df7444b91f7a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.15; version=f9472aaabd1f38954938838a1146db4855ad88e8 <1467a873b20110263cc9c93de99335d139c11e16; version=f9472aaabd1f38954938838a1146db4855ad88e8 <403bf043d9340196e06769065169df7444b91f7a

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-416Use After Free
T1499.004Application or System Exploitation

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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