CVE-2026-64118

Kernel memory corruption via duplicate CID bitmap cleanup

Published Jul 19, 2026 · Updated Jul 19, 2026

Double-free in the Linux kernel QED driver in 4.4 through 7.1-rc3 allows attackers to corrupt kernel memory during device initialization. On a later PF or VF CID bitmap allocation failure, qed_cid_map_alloc() frees earlier bitmaps, after which qed_cxt_tables_alloc() calls qed_cxt_mngr_free() and frees them again. The path requires QED hardware and a failing bitmap allocation during driver resource setup; runtime reproduction has not been reported.

CVSS severity8.4
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Double-free in the Linux kernel QED driver in 4.4 through 7.1-rc3 allows attackers to corrupt kernel memory during device initialization. On a later PF or VF CID bitmap allocation failure, qed_cid_map_alloc() frees earlier bitmaps, after which qed_cxt_tables_alloc() calls qed_cxt_mngr_free() and frees them again. The path requires QED hardware and a failing bitmap allocation during driver resource setup; runtime reproduction has not been reported.

The record

CVE
CVE-2026-64118
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=4.4
  2. Affected versionversion=fe56b9e6a8d957d6a20729d626027f800c17a2da <06fa8e69019fd3c41a7b0ea8c5f509c3a33dc227
  3. Affected versionversion=fe56b9e6a8d957d6a20729d626027f800c17a2da <0e47fc1c9181ae029e0e35a865cbf2adcbae626c
  4. Affected versionversion=fe56b9e6a8d957d6a20729d626027f800c17a2da <2bccfb8476ca5f3548afbd623dc7a6980d4e77de
  5. Affected versionversion=fe56b9e6a8d957d6a20729d626027f800c17a2da <3904b993cc17ec5d7c5d3b57dbd0b775dafb9684
  6. Affected versionversion=fe56b9e6a8d957d6a20729d626027f800c17a2da <8cf5e4d2ca6b101d163c7423a426fb0aec34f7bb
  7. Affected versionversion=fe56b9e6a8d957d6a20729d626027f800c17a2da <9fe030719bd083b766602692ee96c8c985798e3c
  8. Affected versionversion=fe56b9e6a8d957d6a20729d626027f800c17a2da <a04c207f0801abdd23a169b5f902a9845059a65a
  9. Affected versionversion=fe56b9e6a8d957d6a20729d626027f800c17a2da <bdf678a273cadbccc347f331ae2e93ff4d14834c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.4; version=fe56b9e6a8d957d6a20729d626027f800c17a2da <06fa8e69019fd3c41a7b0ea8c5f509c3a33dc227; version=fe56b9e6a8d957d6a20729d626027f800c17a2da <0e47fc1c9181ae029e0e35a865cbf2adcbae626c; version=fe56b9e6a8d957d6a20729d626027f800c17a2da <2bccfb8476ca5f3548afbd623dc7a6980d4e77de; version=fe56b9e6a8d957d6a20729d626027f800c17a2da <3904b993cc17ec5d7c5d3b57dbd0b775dafb9684; version=fe56b9e6a8d957d6a20729d626027f800c17a2da <8cf5e4d2ca6b101d163c7423a426fb0aec34f7bb; version=fe56b9e6a8d957d6a20729d626027f800c17a2da <9fe030719bd083b766602692ee96c8c985798e3c; version=fe56b9e6a8d957d6a20729d626027f800c17a2da <a04c207f0801abdd23a169b5f902a9845059a65a; version=fe56b9e6a8d957d6a20729d626027f800c17a2da <bdf678a273cadbccc347f331ae2e93ff4d14834c

Published CVSS scores

8.4LinuxCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
Privilegesunauthenticated
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo