CVE-2026-64235Network attack vector

Kernel panic via unrelocated ftrace displacement

Published Jul 24, 2026 · Updated Jul 24, 2026

Improper relocation in Linux Kernel x86 ftrace allows remote attackers to panic affected systems through traffic reaching a dynamic trampoline. Copied CALL_DEPTH_ACCOUNT instructions retain a %rip-relative displacement for their original location, so a trampoline writes to the wrong per-CPU address and faults. Exposure requires an x86 retbleed-affected Intel platform with CONFIG_CALL_DEPTH_TRACKING, the non-default retbleed=stuff option, and an active dynamic probe on attacker-reachable code.

CVSS severity8.1
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper relocation in Linux Kernel x86 ftrace allows remote attackers to panic affected systems through traffic reaching a dynamic trampoline. Copied CALL_DEPTH_ACCOUNT instructions retain a %rip-relative displacement for their original location, so a trampoline writes to the wrong per-CPU address and faults. Exposure requires an x86 retbleed-affected Intel platform with CONFIG_CALL_DEPTH_TRACKING, the non-default retbleed=stuff option, and an active dynamic probe on attacker-reachable code.

The record

CVE
CVE-2026-64235
Published
Jul 24, 2026
Updated
Jul 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 24, 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=59bec00ace28d565ae0a68b23063ef3b961d82d5 <8093442a2d1d4b42b9340a86023ccb2afb30b93a
  2. Affected versionversion=59bec00ace28d565ae0a68b23063ef3b961d82d5 <9edff632ca216169846f8a63a5a3dc467e239c7a
  3. Affected versionversion=59bec00ace28d565ae0a68b23063ef3b961d82d5 <a17dc12bfed8868e6a86f3b45c16065a70641acb
  4. Affected versionversion=59bec00ace28d565ae0a68b23063ef3b961d82d5 <d59cc66b702757e3c5a711e78a38583eac0c2738
  5. Affected versionversion=6.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=59bec00ace28d565ae0a68b23063ef3b961d82d5 <8093442a2d1d4b42b9340a86023ccb2afb30b93a; version=59bec00ace28d565ae0a68b23063ef3b961d82d5 <9edff632ca216169846f8a63a5a3dc467e239c7a; version=59bec00ace28d565ae0a68b23063ef3b961d82d5 <a17dc12bfed8868e6a86f3b45c16065a70641acb; version=59bec00ace28d565ae0a68b23063ef3b961d82d5 <d59cc66b702757e3c5a711e78a38583eac0c2738; version=6.9

Published CVSS scores

8.1Linux kernel.orgCVSS:3.1/AV:N/AC:H/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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