CVE-2026-64354

Kernel memory corruption via wrapped BTF field count

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds write in Linux Kernel 6.11.6 through 7.1 allows local users to corrupt kernel memory via malformed BTF data. btf_repeat_fields() calculates an expanded field count in u32, allowing arithmetic wrap to bypass the BTF_FIELDS_MAX capacity check before memcpy() writes beyond the scratch array. Reachability requires BPF_BTF_LOAD privileges, normally init-namespace CAP_BPF or a delegated BPF token; the overwrite can panic the host or corrupt kernel control data.

CVSS severity7.8
High
EPSS probability0.13%
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 write in Linux Kernel 6.11.6 through 7.1 allows local users to corrupt kernel memory via malformed BTF data. btf_repeat_fields() calculates an expanded field count in u32, allowing arithmetic wrap to bypass the BTF_FIELDS_MAX capacity check before memcpy() writes beyond the scratch array. Reachability requires BPF_BTF_LOAD privileges, normally init-namespace CAP_BPF or a delegated BPF token; the overwrite can panic the host or corrupt kernel control data.

The record

CVE
CVE-2026-64354
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
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=6.11.6 <6.12
  2. Affected versionversion=6.12
  3. Affected versionversion=6f957d972feee9b385ea3ae6530310a84e55ba71
  4. Affected versionversion=797d73ee232dd1833dec4824bc53a22032e97c1c <b9452b594fd3aecbfd4aa0a6a1f741330a37dab7
  5. Affected versionversion=797d73ee232dd1833dec4824bc53a22032e97c1c <c5ff816d5f13900c3f1f3298cfcc61339e056e56
  6. Affected versionversion=797d73ee232dd1833dec4824bc53a22032e97c1c <cd407de2ef5dc70f1970b343ffaa16186340fdfd
  7. Affected versionversion=797d73ee232dd1833dec4824bc53a22032e97c1c <ff77d013b737c0f77d925e2f2c59f0cf3d76bd35

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.11.6 <6.12; version=6.12; version=6f957d972feee9b385ea3ae6530310a84e55ba71; version=797d73ee232dd1833dec4824bc53a22032e97c1c <b9452b594fd3aecbfd4aa0a6a1f741330a37dab7; version=797d73ee232dd1833dec4824bc53a22032e97c1c <c5ff816d5f13900c3f1f3298cfcc61339e056e56; version=797d73ee232dd1833dec4824bc53a22032e97c1c <cd407de2ef5dc70f1970b343ffaa16186340fdfd; version=797d73ee232dd1833dec4824bc53a22032e97c1c <ff77d013b737c0f77d925e2f2c59f0cf3d76bd35

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/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 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

T1068Exploitation for Privilege Escalation

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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