CVE-2026-93164

Data corruption via optimized probe red-zone overwrite

Published Sep 17, 2026 · Updated Sep 17, 2026

Memory corruption in Linux 6.18 x86 uprobes allows local users to overwrite application data via optimized probe instrumentation. The int3_update_optimize path in arch/x86/kernel/uprobes.c replaces a five-byte NOP with a trampoline CALL without moving the stack pointer past the 128-byte red zone, overwriting temporary user-space data with a return address. Exposure requires execution of an optimized probe in code using that red zone; the published assessment requires high local privileges, and no privilege escalation is documented.

CVSS severity3.4
Low
EPSS probability0.21%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Linux 6.18 x86 uprobes allows local users to overwrite application data via optimized probe instrumentation. The int3_update_optimize path in arch/x86/kernel/uprobes.c replaces a five-byte NOP with a trampoline CALL without moving the stack pointer past the 128-byte red zone, overwriting temporary user-space data with a return address. Exposure requires execution of an optimized probe in code using that red zone; the published assessment requires high local privileges, and no privilege escalation is documented.

The record

CVE
CVE-2026-93164
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=6.18
  2. Affected versionversion=ba2bfc97b4629b10bd8d02b36e04f3932a04cac4 <1b3fecd09910040668b752f3377d7218ca5c59ac
  3. Affected versionversion=ba2bfc97b4629b10bd8d02b36e04f3932a04cac4 <554ba38456dad8053a1a80afe6ae6da9eff745cc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=6.18; version=ba2bfc97b4629b10bd8d02b36e04f3932a04cac4 <1b3fecd09910040668b752f3377d7218ca5c59ac; version=ba2bfc97b4629b10bd8d02b36e04f3932a04cac4 <554ba38456dad8053a1a80afe6ae6da9eff745cc

Published CVSS scores

3.4Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:L

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
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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