CVE-2026-98020

Kernel crash via cmd_regs reset race

Published Sep 25, 2026 · Updated Sep 25, 2026

Race condition in Linux pds_core allows local administrators to crash the kernel via concurrent PCI function reset and firmware flashing. The reset paths unmap cmd_regs without devcmd_lock while pdsc_legacy_firmware_update reuses the pointer after reacquiring the lock without checking it. Exploitation requires a pds_core physical function on an AMD/Pensando DSC adapter and privileged control of both firmware flashing and device reset.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux pds_core allows local administrators to crash the kernel via concurrent PCI function reset and firmware flashing. The reset paths unmap cmd_regs without devcmd_lock while pdsc_legacy_firmware_update reuses the pointer after reacquiring the lock without checking it. Exploitation requires a pds_core physical function on an AMD/Pensando DSC adapter and privileged control of both firmware flashing and device reset.

The record

CVE
CVE-2026-98020
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 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=6.6.16 <6.7
  2. Affected versionversion=6.7.4 <6.8
  3. Affected versionversion=6.8
  4. Affected versionversion=692488941283d72362274620b9abd28109fc459f
  5. Affected versionversion=e96094c1d11cce4deb5da3c0500d49041ab845b8 <09f831bfe39de5b8026fefb3d106b5cc93272170
  6. Affected versionversion=e96094c1d11cce4deb5da3c0500d49041ab845b8 <2cc697565fd19b5ba2d100cdd4a20dd6d263abc2
  7. Affected versionversion=e96094c1d11cce4deb5da3c0500d49041ab845b8 <7980325b2f71e3f65c1323c39792e2455da6fab6
  8. Affected versionversion=e96094c1d11cce4deb5da3c0500d49041ab845b8 <fa31bd14c5042c6315bb2182c963f03ca6e79ca4
  9. Affected versionversion=f6ec6ac9432941ec85a2221c91b1ecfc85680d89

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=6.6.16 <6.7; version=6.7.4 <6.8; version=6.8; version=692488941283d72362274620b9abd28109fc459f; version=e96094c1d11cce4deb5da3c0500d49041ab845b8 <09f831bfe39de5b8026fefb3d106b5cc93272170; version=e96094c1d11cce4deb5da3c0500d49041ab845b8 <2cc697565fd19b5ba2d100cdd4a20dd6d263abc2; version=e96094c1d11cce4deb5da3c0500d49041ab845b8 <7980325b2f71e3f65c1323c39792e2455da6fab6; version=e96094c1d11cce4deb5da3c0500d49041ab845b8 <fa31bd14c5042c6315bb2182c963f03ca6e79ca4; version=f6ec6ac9432941ec85a2221c91b1ecfc85680d89

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
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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