CVE-2026-23005Hinoki check available

Host kernel panic via inconsistent XSAVE state

Published Jan 25, 2026 · Updated Jan 25, 2026

Denial of service in Linux Kernel allows guest OS users or local users to panic the host kernel through crafted KVM XSAVE state. KVM can retain an XSTATE_BV bit for an XFD-disabled feature while loading KVM_SET_XSAVE state or handling a guest WRMSR, causing XRSTOR to raise #NM. Reachability requires KVM on x86 with XFD-managed state and either a host-interrupt timing window or local access to submit inconsistent XSAVE state.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Denial of service in Linux Kernel allows guest OS users or local users to panic the host kernel through crafted KVM XSAVE state. KVM can retain an XSTATE_BV bit for an XFD-disabled feature while loading KVM_SET_XSAVE state or handling a guest WRMSR, causing XRSTOR to raise #NM. Reachability requires KVM on x86 with XFD-managed state and either a host-interrupt timing window or local access to submit inconsistent XSAVE state.

The record

CVE
CVE-2026-23005
Published
Jan 25, 2026
Updated
Jan 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 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=5.17
  2. Affected versionversion=820a6ee944e74e57255ac2e90916ecdaade57b95 <b45f721775947a84996deb5c661602254ce25ce6
  3. Affected versionversion=820a6ee944e74e57255ac2e90916ecdaade57b95 <eea6f395ca502c4528314c8112da9b5d65f685eb
  4. Affected versionversion=820a6ee944e74e57255ac2e90916ecdaade57b95 <f577508cc8a0adb8b4ebe9480bba7683b6149930

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.17; version=820a6ee944e74e57255ac2e90916ecdaade57b95 <b45f721775947a84996deb5c661602254ce25ce6; version=820a6ee944e74e57255ac2e90916ecdaade57b95 <eea6f395ca502c4528314c8112da9b5d65f685eb; version=820a6ee944e74e57255ac2e90916ecdaade57b95 <f577508cc8a0adb8b4ebe9480bba7683b6149930

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

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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.

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Technologies

Your stack

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Your stack

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