CVE-2025-39763

System reboot via unhandled synchronous error loop

Published Sep 11, 2025 · Updated May 23, 2026

Denial of service in Linux kernel ACPI APEI allows local users to reboot affected systems via abnormal synchronous memory errors. In drivers/acpi/apei/ghes.c, abnormal error paths queue no memory_failure() work, so the faulting task repeats the synchronous external abort. The condition requires local code to trigger an uncorrected memory error on a platform reporting synchronous exceptions; repetition can cross firmware thresholds or hard-lock the kernel.

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

What happened

Denial of service in Linux kernel ACPI APEI allows local users to reboot affected systems via abnormal synchronous memory errors. In drivers/acpi/apei/ghes.c, abnormal error paths queue no memory_failure() work, so the faulting task repeats the synchronous external abort. The condition requires local code to trigger an uncorrected memory error on a platform reporting synchronous exceptions; repetition can cross firmware thresholds or hard-lock the kernel.

The record

CVE
CVE-2025-39763
Published
Sep 11, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=5.4.69 <5.5
  2. Affected versionversion=5.8
  3. Affected versionversion=8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <082735fbcdb6cd0cf20fbec94516ab2996f1cdd5
  4. Affected versionversion=8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <2fbc85da9ac9386bd89fcc94e0aadaea19d47784
  5. Affected versionversion=8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <3cb4f18797247985b0f51d5300f8cb6c78f343ea
  6. Affected versionversion=8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <79a5ae3c4c5eb7e38e0ebe4d6bf602d296080060
  7. Affected versionversion=8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <af089e41811a1ad6a7b2b80e839a73ec4c3cecdd
  8. Affected versionversion=8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <cfc9bc15bda6fd0c496cbe2c628564d4d7c332c1
  9. Affected versionversion=af02933d59bd1621a48d8b0b331cca9e530ba14b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4.69 <5.5; version=5.8; version=8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <082735fbcdb6cd0cf20fbec94516ab2996f1cdd5; version=8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <2fbc85da9ac9386bd89fcc94e0aadaea19d47784; version=8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <3cb4f18797247985b0f51d5300f8cb6c78f343ea; version=8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <79a5ae3c4c5eb7e38e0ebe4d6bf602d296080060; version=8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <af089e41811a1ad6a7b2b80e839a73ec4c3cecdd; version=8fcc4ae6faf8b455eeef00bc9ae70744e3b0f462 <cfc9bc15bda6fd0c496cbe2c628564d4d7c332c1; version=af02933d59bd1621a48d8b0b331cca9e530ba14b

Published CVSS scores

5.5NIST NVDCVSS: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

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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.

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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