CVE-2025-40192

IPMI driver hang via repeated KCS recovery

Published Nov 12, 2025 · Updated May 11, 2026

Infinite loop in the Linux kernel IPMI KCS driver allows a misbehaving BMC to keep error recovery running indefinitely. When a KCS interface becomes hosed, the regressing code reinitializes its state to KCS_ERROR0 and resets retry bookkeeping instead of returning it to idle, so a partially responsive BMC restarts recovery without an effective stop. Reachability requires an enabled KCS-based IPMI interface and a BMC that responds enough to enter recovery but cannot complete the transaction; the loop can monopolize the IPMI polling path and prevent management operations from completing.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Infinite loop in the Linux kernel IPMI KCS driver allows a misbehaving BMC to keep error recovery running indefinitely. When a KCS interface becomes hosed, the regressing code reinitializes its state to KCS_ERROR0 and resets retry bookkeeping instead of returning it to idle, so a partially responsive BMC restarts recovery without an effective stop. Reachability requires an enabled KCS-based IPMI interface and a BMC that responds enough to enter recovery but cannot complete the transaction; the loop can monopolize the IPMI polling path and prevent management operations from completing.

The record

CVE
CVE-2025-40192
Published
Nov 12, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

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=6.2
  2. Affected versionversion=c608966f3f9c2dca596967501d00753282b395fc <5d09ee1bec870263f4ace439402ea840503b503b
  3. Affected versionversion=c608966f3f9c2dca596967501d00753282b395fc <8cf5c24533b8058910fcb83a25a9cf0306383780
  4. Affected versionversion=c608966f3f9c2dca596967501d00753282b395fc <b9cc7155e65f6feca51bfedd543b9bd300e2be2b
  5. Affected versionversion=c608966f3f9c2dca596967501d00753282b395fc <f4aab940ae9eb3ba32e5332b35703673f00d7f37

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=c608966f3f9c2dca596967501d00753282b395fc <5d09ee1bec870263f4ace439402ea840503b503b; version=c608966f3f9c2dca596967501d00753282b395fc <8cf5c24533b8058910fcb83a25a9cf0306383780; version=c608966f3f9c2dca596967501d00753282b395fc <b9cc7155e65f6feca51bfedd543b9bd300e2be2b; version=c608966f3f9c2dca596967501d00753282b395fc <f4aab940ae9eb3ba32e5332b35703673f00d7f37

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)
VectorUnavailable
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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