CVE-2026-90358

Kernel control-flow hijack via undersized BPF stack

Published Sep 17, 2026 · Updated Sep 18, 2026

Memory corruption in the x86 BPF trampoline in affected Linux kernels allows local users with BPF capabilities to hijack kernel control flow. save_args() reserves one register slot for a 16-byte scalar, then writes both halves of the argument over saved frame data. Exploitation requires CAP_BPF and CAP_PERFMON access and can disclose kernel memory, redirect execution, or panic the host.

CVSS severity7.8
High
EPSS probability0.16%
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 the x86 BPF trampoline in affected Linux kernels allows local users with BPF capabilities to hijack kernel control flow. save_args() reserves one register slot for a 16-byte scalar, then writes both halves of the argument over saved frame data. Exploitation requires CAP_BPF and CAP_PERFMON access and can disclose kernel memory, redirect execution, or panic the host.

The record

CVE
CVE-2026-90358
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=6.1
  2. Affected versionversion=a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 <40f3bfbbb222b92278f3797614b70f68d46824ac
  3. Affected versionversion=a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 <4aed2346fa9b88d458eeb8c01123f3c07585a675
  4. Affected versionversion=a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 <814cba835ef648e0c5eb79505c96c0493b29eea6
  5. Affected versionversion=a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 <a6d7d7a253c550e74b0651897fe313c2f9b2301f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.1; version=a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 <40f3bfbbb222b92278f3797614b70f68d46824ac; version=a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 <4aed2346fa9b88d458eeb8c01123f3c07585a675; version=a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 <814cba835ef648e0c5eb79505c96c0493b29eea6; version=a9c5ad31fbdc4dec6d266fe22e51de1ad6d1bcf2 <a6d7d7a253c550e74b0651897fe313c2f9b2301f

Published CVSS scores

6.1Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
7.8Linux CNACVSS: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.

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
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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