CVE-2026-93079Hinoki check available

Kernel memory corruption via mismatched feature lengths

Published Sep 17, 2026 · Updated Sep 18, 2026

Heap-based buffer overflow in Linux 6.15 through 6.18.51 and 6.19 through 7.2.5 allows local users to corrupt kernel memory. cxlctl_get_feature() allocates from fwctl_rpc.out_len but passes a separate, unbounded count to the device for writing into rpc_out->payload. The attack requires low-privileged local access to FWCTL_RPC; the overwrite compromises kernel memory integrity and system availability.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Heap-based buffer overflow in Linux 6.15 through 6.18.51 and 6.19 through 7.2.5 allows local users to corrupt kernel memory. cxlctl_get_feature() allocates from fwctl_rpc.out_len but passes a separate, unbounded count to the device for writing into rpc_out->payload. The attack requires low-privileged local access to FWCTL_RPC; the overwrite compromises kernel memory integrity and system availability.

The record

CVE
CVE-2026-93079
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-122
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

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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=5908f3ed6dc209e5c824e63afda7545805f75a7e <329ea475581c647a680a6937e353c1a6e2534b40
  2. Affected versionversion=5908f3ed6dc209e5c824e63afda7545805f75a7e <3f02031a0a53de0d3ef066c92d0486b2b11be40c
  3. Affected versionversion=5908f3ed6dc209e5c824e63afda7545805f75a7e <4bf6bac375076ced2fa4b3fef8739bd985f93456
  4. Affected versionversion=6.15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5908f3ed6dc209e5c824e63afda7545805f75a7e <329ea475581c647a680a6937e353c1a6e2534b40; version=5908f3ed6dc209e5c824e63afda7545805f75a7e <3f02031a0a53de0d3ef066c92d0486b2b11be40c; version=5908f3ed6dc209e5c824e63afda7545805f75a7e <4bf6bac375076ced2fa4b3fef8739bd985f93456; version=6.15

Published CVSS scores

7.8CanonicalCVSS: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

CWE-122Heap-based Buffer Overflow

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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