CVE-2026-64460

Host crash via erroneous VF BAR index

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds read in Linux Kernel 6.17 allows local users to crash the host during PCI state restoration after a device read error. sriov_restore_vf_rebar_state() decodes an all-ones error response as BAR index 7, then reads past the six-entry dev->sriov->barsz array. Reachability requires VF Resizable BAR restoration while the device is inaccessible; the resulting bounds violation can cause a host oops or panic.

CVSS severity7.0
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Linux Kernel 6.17 allows local users to crash the host during PCI state restoration after a device read error. sriov_restore_vf_rebar_state() decodes an all-ones error response as BAR index 7, then reads past the six-entry dev->sriov->barsz array. Reachability requires VF Resizable BAR restoration while the device is inaccessible; the resulting bounds violation can cause a host oops or panic.

The record

CVE
CVE-2026-64460
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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=5a8f77e24a30bbce2fa57926f3dede84894fd10a <55fd485e66d0ad5c762c23dba1461fe9c741cd96
  2. Affected versionversion=5a8f77e24a30bbce2fa57926f3dede84894fd10a <b77524621250407386f44c6eea7e5e4619ada1ce
  3. Affected versionversion=5a8f77e24a30bbce2fa57926f3dede84894fd10a <f34f1712229d71ce4286440fef12526fd4590b37
  4. Affected versionversion=6.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5a8f77e24a30bbce2fa57926f3dede84894fd10a <55fd485e66d0ad5c762c23dba1461fe9c741cd96; version=5a8f77e24a30bbce2fa57926f3dede84894fd10a <b77524621250407386f44c6eea7e5e4619ada1ce; version=5a8f77e24a30bbce2fa57926f3dede84894fd10a <f34f1712229d71ce4286440fef12526fd4590b37; version=6.17

Published CVSS scores

7.0Linux Kernel CVE teamCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:L/I:L/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.

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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.

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Technologies

Your stack

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Your stack

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