CVE-2026-97993Hinoki check available

Kernel crash via transient error-pointer signaling

Published Sep 25, 2026 · Updated Sep 25, 2026

Race condition in the vhost-vdpa configuration path in Linux allows local users to crash the kernel during eventfd setup. vhost_vdpa_set_config_call() installs an eventfd_ctx_fdget() error pointer in config_ctx before checking it, and a concurrent configuration callback passes that pointer to eventfd_signal(). Triggering the crash requires access to configure a vhost-vdpa device and winning the brief interrupt race; a rejected file descriptor can also stop configuration interrupts.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Race condition in the vhost-vdpa configuration path in Linux allows local users to crash the kernel during eventfd setup. vhost_vdpa_set_config_call() installs an eventfd_ctx_fdget() error pointer in config_ctx before checking it, and a concurrent configuration callback passes that pointer to eventfd_signal(). Triggering the crash requires access to configure a vhost-vdpa device and winning the brief interrupt race; a rejected file descriptor can also stop configuration interrupts.

The record

CVE
CVE-2026-97993
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

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

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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=5.8
  2. Affected versionversion=776f395004d829bbbf18c159ed9beb517a208c71 <388c678639a0cebfd936b3e56c64ac6a371efec2
  3. Affected versionversion=776f395004d829bbbf18c159ed9beb517a208c71 <65faf9eaa00e408e1406fbcf675c8c8d0e27ff2a
  4. Affected versionversion=776f395004d829bbbf18c159ed9beb517a208c71 <6b20b40f020bde236f6b8a08ff88d8653261ec2b
  5. Affected versionversion=776f395004d829bbbf18c159ed9beb517a208c71 <e74a9fa50749b9940b4fb13199652325e08d3c4a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.8; version=776f395004d829bbbf18c159ed9beb517a208c71 <388c678639a0cebfd936b3e56c64ac6a371efec2; version=776f395004d829bbbf18c159ed9beb517a208c71 <65faf9eaa00e408e1406fbcf675c8c8d0e27ff2a; version=776f395004d829bbbf18c159ed9beb517a208c71 <6b20b40f020bde236f6b8a08ff88d8653261ec2b; version=776f395004d829bbbf18c159ed9beb517a208c71 <e74a9fa50749b9940b4fb13199652325e08d3c4a

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

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

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