CVE-2025-39733Public exploit

Kernel service interruption via team lock inversion

Published Sep 7, 2025 · Updated May 11, 2026

Lock-order inversion in Linux kernel 6.15 through 6.15.9 and 6.16 allows local users to interrupt service through deadlock. The team driver acquires its team mutex while updating or removing lower interfaces whose device locks can be acquired in the reverse order. Reachability requires local low-privilege access and a configured team device with lower interfaces; the reported consequence is availability-only kernel deadlock.

CVSS severity5.5
Medium
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Lock-order inversion in Linux kernel 6.15 through 6.15.9 and 6.16 allows local users to interrupt service through deadlock. The team driver acquires its team mutex while updating or removing lower interfaces whose device locks can be acquired in the reverse order. Reachability requires local low-privilege access and a configured team device with lower interfaces; the reported consequence is availability-only kernel deadlock.

The record

CVE
CVE-2025-39733
Published
Sep 7, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 7, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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=6b1d3c5f675cc794a015138b115afff172fb4c58 <53edc761c9911f597b6d701e846f6e84f15eaa6d
  3. Affected versionversion=6b1d3c5f675cc794a015138b115afff172fb4c58 <556a4337ba3e9a70e1e3a428e8465c3ea3c4aa41
  4. Affected versionversion=6b1d3c5f675cc794a015138b115afff172fb4c58 <bfb4fb77f9a8ce33ce357224569eae5564eec573

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.15; version=6b1d3c5f675cc794a015138b115afff172fb4c58 <53edc761c9911f597b6d701e846f6e84f15eaa6d; version=6b1d3c5f675cc794a015138b115afff172fb4c58 <556a4337ba3e9a70e1e3a428e8465c3ea3c4aa41; version=6b1d3c5f675cc794a015138b115afff172fb4c58 <bfb4fb77f9a8ce33ce357224569eae5564eec573

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/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 exploitPublished

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

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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