CVE-2025-40357

Kernel crash via SMC socket initialization race

Published Dec 16, 2025 · Updated Dec 16, 2025

Race condition in the Linux kernel SMC diagnostics allows local users to crash the system through concurrent socket creation and dump requests. During socket creation, inet_init_csk_locks overwrites smc->clcsock before initialization completes while __smc_diag_dump traverses the socket hash and dereferences it. The demonstrated trigger requires CONFIG_DEBUG_LOCK_ALLOC and a race with a diagnostic Netlink dump; the reported consequence is a kernel crash.

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

Race condition in the Linux kernel SMC diagnostics allows local users to crash the system through concurrent socket creation and dump requests. During socket creation, inet_init_csk_locks overwrites smc->clcsock before initialization completes while __smc_diag_dump traverses the socket hash and dereferences it. The demonstrated trigger requires CONFIG_DEBUG_LOCK_ALLOC and a race with a diagnostic Netlink dump; the reported consequence is a kernel crash.

The record

CVE
CVE-2025-40357
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 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=6.11
  2. Affected versionversion=d25a92ccae6bed02327b63d138e12e7806830f78 <5b6fc95c4a161326567bdf12a333768565b638f2
  3. Affected versionversion=d25a92ccae6bed02327b63d138e12e7806830f78 <99b5b3faf3220ba1cdab8e6e42be4f3f993937c3
  4. Affected versionversion=d25a92ccae6bed02327b63d138e12e7806830f78 <f584239a9ed25057496bf397c370cc5163dde419

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.11; version=d25a92ccae6bed02327b63d138e12e7806830f78 <5b6fc95c4a161326567bdf12a333768565b638f2; version=d25a92ccae6bed02327b63d138e12e7806830f78 <99b5b3faf3220ba1cdab8e6e42be4f3f993937c3; version=d25a92ccae6bed02327b63d138e12e7806830f78 <f584239a9ed25057496bf397c370cc5163dde419

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.

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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